The Stenopodainae (Hemiptera, Heteroptera) of Argentina

Abstract In Argentina, 10 genera and 33 species of Stenopodainae (Hemiptera: Reduviidae) have been recorded. Diagnoses of the genera, subgenera and species are given, and an illustrated key to genera is provided. Six species are new records for Argentina and an additional seven species represent new records for provinces.


Introduction
The Stenopodainae are characterized by the presence of a large cell, usually pentagonal or hexagonal, in the venation of the hemelytra, formed by the cubital and postcubital veins and the apical and posterior cubital and postcubital crossveins Weirauch and Munro 2009). The antenniferous tubercles and juga (mandibular plates) are usually strongly produced anteriorly. The elongate and incrassate scapus is also an important subfamily character Schuh and Slater 1995).
Type species. Ctenotrachelus macilentus Stål, 1872, subsequent monotypy. , Giacchi 1985, Maldonado Capriles 1994a Anteocular region twice as long as postocular region. Setigerous tubercle on ventral side of head much smaller than the ventrolateral tubercle behind eyes. Pronotum longer than wide, with the anterior lobe much longer than posterior one. Scutellar spine horizontal, metascutellar spine small. Fore femora sligthly incrassate. Anterior legs with third tarsal segment longer than first and second together.

Ctenotrachelus striatus Barber
Ctenotrachelus striatus Barber, 1930: 197;Giacchi 1985: 67;Coscarón 2003 , Giacchi 1973) Preocular region longer than postocular region. Juga long, robust and blunt apex, well extended beyond apices of antenniferous tubercles. Scapus shorter than head. First labial segment nearly equal to the second and third segments together. Hind tibiae with short setae, never reaching twice the diameter of the tibia. Anterior femora scarcely incrassate. Abdomen in ventral view with a median longitudinal carina, extending from sternum II to VI.
Observation. First record for La Pampa province.

Diaditus pilosicornis Bergroth
Diaditus pilosicornis Bergroth, 1907: 50;Melo et al. 2011. , Giacchi 1982 Males with setae on ventral and lateral internal face of Pedicellus, seta length three times the diameter of Pedicellus. Juga reaching more than 1/3 of scapus in males and more than half in females. Prosternum glabrous, if tubercles or setae are present, these are scarce and conspiscuous. Collar angle obtuse. Fore femora in the ventral surface, basally with one spiniferous tubercle, the height is twice or more than setigerous tubercles of the trochanter. Observation. First record for Salta province.

Diagnosis. (After
Remarks. The species currently assigned to the taxon is listed in Coscarón et al. (2014).
Note. Wygodzinsky and Giacchi (1986) synonymised Pnohirmus Stål, with Gnathobleda Stål. Latter, Wygodzinsky and Giacchi (1994) in the key to the genera of the Stenopodainae of the new world they included the subgenera Ganthobleda (Gnathobleda) and Gnathobleda (Pnohirmus). In this article they did not mentioned the species for each subgenera. We do not use the subgenera of Gnathobleda due to this confusion.
Observation. New record for Argentina.

Narvesus minor (Barber)
Narvesus minor Barber, 1930: 224;Giacchi 1974: 62; , Giacchi 1985 First labial segment about as long as second segment. Posterior ocular region shorter than anteocular region. Pronotum longer than wide, with deep transverse groove before the half. Disc of fore lobe of pronotum with 1 +1 distinct tubercles. Apical angles of segments II to VI terminated in triangular lobes, apical angles of segment VII ending in two acute lobes directed posteriorly. ( , Giacchi 1985 Diameter of the gula much wider, being about twice as wide as the diameter of base of second labial segment. Scapus about twice as long as the preocular region. Discal spines of anterior lobe situated before the constriction with tubercles reduced. Remarks. The species currently assigned to the taxon is listed in Coscarón et al. (2014).

Oncocephalus Klug
Reduvius ( Giacchi, 1984) Body oval. Eyes of male large, eyes of female smaller, with several rather distinct setigerous tubercles behind eyes. Antennae and tibiae with long setae, particularly in males. Basal segment of rostrum shorter than the two apical segments together. Fore femora strongly incrassate and distinctly spinose (with one or two row(s) of teeth on the ventral side).
Diagnosis. (After  Scapus not produced beyond insertion of basiflagellomere. First labial segment approximately twice as long as second and third segments. Scapus unarmed beneath. Head dorsally armed with two prominent tubercles.
Distribution in Argentina. Misiones.

Seridentus Osborn
Seridentus Osborn, 1904: 195. Type species. Seridentus denticulatus Osborn, 1904. Diagnosis. (After Maldonado Capriles 1994a) Anteocular space as long as or slightly shorter than postocular space. Two lines of setigerous tubercles on ventral side of head slightly surpassing the anterior and posterior margins of eyes. Spines about half as long as posteroventral setigerous tubercles behind eyes. Scutellar spine angulate, raised or vertical. Profemur moderately incrassate. Anterior legs with third tarsal segment twice as long as first and second combined.
Lateral margins of pronotum with a row of small to setigerous tubercles. Pronotum less.

Seridentus maculosus (Haviland)
Seridentus maculosus Haviland, 1931 , Giacchi 1988b) First labial segment shorter than the second and third segments combined. Postocular region shorter than preocular one. Body and appendages with dense, adpressed pubescence and numerous tiny, erect bristles. Margins of head nearly parallel-sided in dorsal view, abruptly constricted at neck. Two median dorsal carinae (1+1) more or less elevated.