(modified from Schmid 1955; characters pertain to the male of the type species, except where noted): Head short, but broad, with large, projecting eyes, with conspicuous setae between ommatidea (Fig. 1); in most species interocular distance equal to or slightly less than diameter of eye, when viewed frontally (eyes of females smaller, interocular distance about 2× diameter of eye). According to Schmid (1955) bordering the eyes medially is an elongate, convex cephalic tubercle, but this structure was not evident in the material of the type species examined by us. Head dorsally with prominent, elongate occipital and retroccipital warts; ocellar, antennal, frontal, anterolateral, and hypomedial setal warts absent (terminology of Ivanov 1990) (although females with small anterolateral setal wart). Antennal scape much shorter than head and about as wide as long, with oval setal warts on both its dorsal and ventral surfaces; scapes almost touch medially. Maxillary palp very short, composed of enlarged, heavily setose basal article held against the face and sclerotized on its lateral side only, medial side membranous, with small, oval, sclerotized, setose apical article (Fig. 2) (female maxillary palp 5-segmented, unmodified). Labial palp 3-segmented, unmodified. Pronotum with pair of elongate setal warts (Fig. 1). Mesoscutum with very deep median fissure and pair of small, oval scutal warts; mesoscutellum with pair of large scutellar warts (Fig. 1). Each leg with pair of apical spurs (tibial spur formula 2-2-2). Wings are broad, forewing longer and broader than hind wing; wing venation uniform among the species. Forewing (Fig. 3A) with forks I, II, III, and V present; cross vein r between R1 and R2; discoidal cell present and short, forks II and III sessile; crossveins r-m and m-cu present (in Notidobiella amazoniana sp. n., and Notidobiella ecuadorensis sp. n., crossveins r and s absent or very weak and difficult to discern in the material examined; the absence of s leaves the discoidal cell open); Cu2 not attaining wing margin, merged apically with Cu1b; A1 and A2 each attaining wing margin, A3 absent. Hind wing (Fig. 3B) with discoidal cell open; forks I, II, V present; fork I petiolate; fork II sessile; M with single branch; fork V short. Male genitalia (Figs 4, 8): Sternum VII with posteromesal process. Segment IX with short or long ventral setose lobes or only single setose process (Notidobiella amazoniana sp. n.). Preanal appendages short, ovate, setose. Tergum X simple, triangular to subquadrate in shape. Inferior appendage narrow basally and broadly spatulate apically, with short to long mesal process on ventromesal margin (in Notidobiella amazoniana sp. n., inferior appendage uniformly narrow throughout its length and without mesal process on the ventromesal margin). Phallus simple, elongate, tubular, with prominent endophallic membranes. Female genitalia (Figs 5, 9): Tergum IX heavily setose, posterolateral lobe, with lateral, microsetose, elevated ridge (all species except Notidobiella brasiliana sp. n.). Internal vaginal sclerites complex with no discernable differences among the species. Bursa copulatix subspherical and semisclerotized; pair of small, oval sclerites lying in membranes above vaginal sclerites (position variable).

Flint (1967) described the immature stages of Notidobiella chacayana. Larvae construct slightly tapered and curved cases of small mineral fragments embedded in silk and occur on the bottoms of small streams. The 3 previously known species, Notidobiella chacayana Schmid, 1957, Notidobiella inermis Flint, 1983, and Notidobiella parallelipipeda Schmid, 1955, are endemic to southern Chile.

Of the species in the genus with broad, spatulate inferior appendages (all species except Notidobiella amazoniana), the type species is the most distinctive based on the parallel-sided inferior appendages with their prominent, mesally directed, mesal processes.

Adult. Forewing length 7.8–8.0 mm male (n=2); 8.8–9.0 mm female (n=2). Color light brown, palps and legs stramineous; forewings light brown, with scattered golden setae. Sternum VII of male with broad, fingernail-like, posteromesal process.

Male genitalia (Fig. 4). Segment IX with anterior margin broadly produced midlaterally; tergum IX narrow; sternum IX with pair of very short, posteromesal processes, bearing long apical setae. Tergum X simple, subquadrate in lateral view, with slight apicolateral elevation, with slight dorsomesal excavation, setose apically. Preanal appendage short, ovate, setose. Inferior appendage prominent, heavily setose, spatulate, dorsal and ventral edges parallel, narrow basally, with prominent, elongate mesal process on mesal margin; strongly directed mesally in ventral view; apex exposed in lateral view. Phallic apparatus simple, tubular, slightly curved from base to apex; endophalic membranes prominent, but simple; phallotremal sclerite not apparent.

Female genitalia (Fig. 5). Tergum VIII quadrate; pleural membranes extensive, highly folded; sternum VIII broad, anterior margin with apodemal ridge, extending dorsolaterally; posterolateral corners rounded, heavily setose, especially posteriorly. Tergum IX with heavily setose, posterolateral lobes, rounded in lateral view, triangular in dorsal view; with lateral, microsetose, elevated ridge; sternum IX highly membranous, the membranes with parallel pleats or folds; tergum IX semimembranous dorsally. Tergum X with short setose projection. Internal vaginal sclerites complex (no discernable differences among the species); bursa copulatix subspherical, semisclerotized; pair of small, oval sclerites lying in membranes above vaginal sclerites (position variable).

CHILE: Ñuble, Recinto, 4–6.iii.1968, Flint and Peña, 1 male, 1 female (pinned) (NMNH); Linares, El Castillo, Malcho, E Parral, 750 m, 8–10.i.1988, L.E. Peña, 1 male, 1 female (pinned) (NMNH).

This is the smallest species in the genus. Its wings are short and broad with venation typical for the genus except forewing crossveins r and s are absent, leaving the discoidal cell open (Fig. 7). Its genitalia are the most atypical in the genus in that the inferior appendages are not broadly spatulate, but sinuous in shape and uniform in width. Tergum IX bears a short triangular, posteromesal process, rather than short, paired processes, as found in the other species. Otherwise, the genitalia are typical for the genus.

Adult. Forewing length 4.5–5.0 mm male (n=8). Color faded, overall pale stramineous (specimens in alcohol); forewings colorless, almost transparent, denuded. Sternum VII of male with broad, fingernail-like, posteromesal process.

Male genitalia (Fig. 6). Segment IX with anterior margin acutely produced ventrolaterally; tergum IX narrow, ridge-like; sternum IX with short, triangular, posteromesal process, bearing apical setae. Tergum X simple, subquadrate in lateral view, with slight dorsomesal excavation, setose. Preanal appendage short, ovate, setose. Inferior appendage prominent, heavily setose, elongate, narrow throughout length, without mesal process on ventromesal margin; in ventral view, apex acute, slightly incurved. Phallic apparatus simple, tubular, slightly curved from base to apex; endophalic membranes prominent, with paired apical membranous lobes; elongate, lightly sclerotized band internally (perhaps the phallotremal sclerite).

Unknown.

BRAZIL: Amazonas: AM 010, km 246, 15–16.vii.1979, J. Arias (alcohol) (UMSP000131226) (INPA).

BRAZIL: Amazonas: same data as holotype, 3 males (alcohol) (UMSP), 4 males (alcohol) (NMNH).

Named for the state and region where the specimens were collected, which represents a significant northern extension of the range of the genus.

This new species is most similar to Notidobiella chacayana in the overall shape and structure of the inferior appendages. Both species possess an elongate mesal process on the ventromesal margin of the inferior appendage. In Notidobiella ecuadorensis sp. n., the ventromesal process is also present, but is shorter and broader in ventral view; in the other 2 Chilean species, Notidobiella inermis and Notidobiella parallelipipeda, the ventromesal processes are either very reduced (Notidobiella inermis) or long (Notidobiella parallelipipeda), but not nearly as long as in Notidobiella brasiliana sp. n. Setting Notidobiella brasiliana sp. n., apart from all of its congeners is the pair of elongate posteromesal processes on sternum IX; in all other species these processes are much shorter and broader. Furthermore, forewing crossveins r and s are absent, leaving the discoidal cell open (Fig. 10).

Adult. Forewing length 7.0 mm male (n=1); 7.9–8.2 mm female (n=4). Color medium to dark brown, palps and legs light brown; forewings dark brown with scattered golden hairs, pale golden spot on anal margin at about midlength. Sternum VII of male with broad, fingernail-like, posteromesal process.

Male genitalia (Fig. 8). Segment IX with anterior margin broadly produced mesolaterally; tergum IX narrow, elevated, mound-like; sternum IX with pair of prominent, elongate, posteromesal processes, bearing long apical setae. Tergum X simple, triangular in lateral view, with slight dorsomesal excavation, setose. Preanal appendage short, ovate, setose. Inferior appendage prominent, heavily setose, broadly spatulate, narrow basally, with elongate mesal process on ventromesal margin. Phallic apparatus simple, tubular, slightly curved from base to apex; endophalic membranes prominent, but simple; phallotremal sclerite not apparent.

Female genitalia (Fig. 9). Tergum VIII quadrate; pleural membranes extensive, highly folded; sternum VIII broad, anterior margin with apodemal ridge, extending dorsolaterally; posterolateral corners rounded, heavily setose, especially posteriorly. Tergum IX with heavily setose, posterolateral lobes, rounded in dorsal and lateral views; without lateral ridge; sternum IX highly membranous, the membranes with parallel pleats or folds; tergum IX semimembranous dorsally. Tergum X with short, bifurcate, setose projection. Internal vaginal sclerites complex (no discernable differences among the species); bursa copulatix subspherical, semisclerotized; pair of small, oval sclerites lying in membranes above vaginal sclerites (position variable).

BRAZIL: São Paulo: Parque Estadual de Campos do Jordão, 1st order trib. to Rio Galharada, 22°41.662'S, 45°27.783'W, el 1530 m, 14–16.ix.2002, Blahnik, Prather, Huamantinco (pinned) (UMSP000086351) (MZUSP).

BRAZIL: São Paulo: Parque Estadual de Campos do Jordão, Rio Galharada, 22°41.662'S, 45°27.783'W, el 1530 m, 13–15.ix.2002, Blahnik, Prather, Melo, Huamantinco, 2 females (alcohol) (MZUSP); same data as holotype, 2 females (pinned) (UMSP).

Named for Brazil, the country of the type specimens, which represents a significant northeastward extension of the range of the genus.

This Chilean species is most similar to Notidobiella brasiliana because of the similarly shaped inferior appendages, with their similar elongate mesal processes. It differs from that species in the much shorter posteromesal processes of sternum IX.

Adult. Forewing length 6.8–7.5 mm male (n=3); 7.2–9.0 mm female (n=3). Color brown, palps and legs stramineous; forewings brown, with scattered golden setae. Sternum VII of male with broad, fingernail-like, posteromesal process.

Male genitalia (Fig. 11). Segment IX with anterior margin produced ventrolaterally; tergum IX slightly elevated, mound-like; sternum IX with pair of short, posteromesal processes, bearing long apical setae. Tergum X simple, triangular in lateral view, with dorsomesal excavation, setose. Preanal appendage short, ovate, setose. Inferior appendage prominent, heavily setose, broadly spatulate, narrow basally, with elongate mesal process on ventromesal margin. Phallic apparatus simple, tubular, curved from base to apex; endophalic membranes prominent, but simple; phallotremal sclerite not apparent.

Female genitalia (Fig. 12). Tergum VIII quadrate; pleural membranes extensive, highly folded; sternum VIII broad, anterior margin with apodemal ridge, extending dorsolaterally; posterolateral corners rounded, heavily setose, especially posteriorly. Tergum IX with heavily setose, posterolateral lobes, rounded to subtriangular in dorsal view; with lateral, microsetose, elevated ridge; sternum IX highly membranous, the membranes with parallel pleats or folds; dorsally tergum IX semimembranous. Tergum X with short setose projection. Internal vaginal sclerites complex (no discernable differences among the species); bursa copulatix subspherical, semisclerotized; pair of small, oval sclerites lying in membranes above vaginal sclerites (position variable).

CHILE: Cauquenes, Tregualeme, 35°56'S, 72°43'W, 11–12.xii.1993, C. and O. Flint Jr., 1 male, 1 female (pinned) (NMNH); X Región de los Lagos, Isla de Chiloé, Río Verde, 1.9 km W Puntra, 42°07.078'S, 73°50.364'W, el. 40 m, 3.ii.2005, Holzenthal, Blahnik, Chamorro, 2 males, 2 females (pinned) (UMSP); XIV Región de los Ríos, Monumento Nacional Alerce Costero, unnamed trib., trail to Alerce Milenario, 40°11.874'S, 73°26.217'W, el. 895 m, 5.ii.2008, Holzenthal, Pauls, Mendez, 1 male (pinned) (UMSP).

The combination of broadly spatulate inferior appendage, thumb-like mesal process on the ventromesal margin of the inferior appendage, and short posteromesal processes on sternum IX separate this species from its congeners. The wing venation (Fig. 14) is similar to that of the type species.

Adult. Forewing length 6.2 mm (n=1). Color faded, overall yellowish-brown (specimen in alcohol); forewings stramineous, denuded. Sternum VII of male with broad, fingernail-like, posteromesal process.

Male genitalia (Fig. 13). Segment IX with anterior margin broadly produced midlaterally; tergum IX narrow, elevated, mound-like; sternum IX with pair of short, triangular, posteromesal processes, bearing very long apical setae. Tergum X simple, triangular in lateral view, with slight dorsomesal excavation, setose apically. Preanal appendage short, ovate, setose. Inferior appendage prominent, heavily setose, very broadly spatulate, narrow basally, with short, thumb-like mesal process on ventromesal margin. Phallic apparatus simple, tubular, relatively straight from base to apex; endophalic membranes prominent, with paired apical membranous lobes; elongate, lightly sclerotized band internally (perhaps the phallotremal sclerite).

Unknown.

male, ECUADOR: Pastaza: Puyo, 1–7.ii.1976, Spangler et al. (alcohol) (UMSP000208470) (NMNH).

Named for Ecuador, the country of the holotype, which represents a significant northern extension of the range of the genus.

Notidobiella inermis shares with Notidobiella ecuadorensis broadly spatulate inferior appendages with short, thumb-like mesal processes, but differs in details of the shape of the inferior appendages, as illustrated, and in the possession of a narrow posteromesal process on sternum VII.

Adult. Forewing length 6.0–6.5 mm male (n=2); 8.0 mm female (n=2). Color brown, palps and legs stramineous; forewings brown, with scattered golden setae. Sternum VII of male with narrow, fingernail-like, posteromesal process.

Male genitalia (Fig. 15). Segment IX with anterior margin produced ventrolaterally; tergum IX narrow; sternum IX with pair of short, posteromesal processes, bearing long apical setae. Tergum X simple, subquadrate in lateral view, with slight dorsomesal excavation, setose. Preanal appendage short, ovate, setose. Inferior appendage prominent, heavily setose, very broadly spatulate, narrow basally, with short, thumb-like mesal process on ventromesal margin. Phallic apparatus simple, tubular, relatively straight from base to apex; endophalic membranes prominent, but simple; phallotremal sclerite not apparent.

Female genitalia (Fig. 16). Tergum VIII quadrate; pleural membranes extensive, highly folded; sternum VIII broad, anterior margin with apodemal ridge, extending dorsolaterally; posterolateral corners rounded, heavily setose, especially posteriorly. Tergum IX with heavily setose, posterolateral lobes, subovate, small, bilobed in dorsal and lateral views; with lateral, microsetose, elevated ridge; sternum IX highly membranous, the membranes with parallel pleats or folds; dorsally tergum IX with sclerotized ridge. Tergum X with broad heavily setose projection. Internal vaginal sclerites complex, no discernable differences among the species; bursa copulatix subspherical, semisclerotized; pair of small, oval sclerites lying in membranes above vaginal sclerites (position variable).

CHILE: Llanquihue, Salto Chamiza, Correntosa, 100 m, 19.i.1987, C.M. and O.S. Flint, Jr., 1 male, 2 females (pinned) (NMNH); Llanquihue, El Chinque, N Correntosa (S Volcán Calbuco), 300 m, 20–25.i.1980, 1 male paratype (pinned) (NMNH).