First record of Neolindus Scheerpeltz from French Guiana (Coleoptera, Staphylinidae, Paederinae), with a key to males

Abstract The genus Neolindus Scheerpeltz, 1933, of the tribe Cylindroxystina Bierig, 1943, is recorded from French Guiana for the first time. Two new species, Neolindus irmleri sp. n. and Neolindus hermani sp. n., are described and illustrated. A key to males of Neolindus is provided.


Introduction
The genus Neolindus Scheerpeltz, 1933 was revised by Herman (1991) in his extensive phylogenetic work and revision of the tribe Cylindroxystina. In that publication he described three characters that support the monophyletic status of the genus and described 27 species, principally from South America.
More recently, Irmler (2011) described two new species from the Peruvian Amazon. Neolindus is currently the larger of the two Neotropical genera (Neolindus and Cylindrxystus) of Cylindroxystina, represented by 35 species distributed from northern Costa Rica to southern Brazil (Herman 2001, Irmler 2011, 29 of which are known only from South America. Neolindus species are typically found in forest leaf litter at altitudes ranging from 50 to 2500 m.
In this paper, two new species of Neolindus are described and illustrated and the genus is recorded for the first time from French Guiana, increasing the number of known species to 37. A key to males of the genus is presented based mainly on characters of the genitalia. Neolindus amazonicus Irmler 1981, N. peruvianus Irmler 1981and N. hanagarthi Irmler 1981 are excluded from the key because they are known only from females.

Specimens.
Specimens were collected via flight interception traps (FIT or window traps), an especially useful capture method which has resulted in the discovery of many new species of multiple taxa. The specimens studied here were collected by SEAG (Société Entomologique Antilles-Guyane) with FITs hung approximately 1.50 m above ground level ( Fig. 1 in Degallier et al. 2011). Traps consisted of an acrylic panel hung vertically in the forest and a gutter at the base of the panel containing a preservative fluid (water, salt and detergent, or propylene glycol).
To study morphological characters, dried specimens were macerated in boiling water for five minutes and then cleared in 10% KOH overnight. Dissections were carried out under a Carl Zeiss Stemi SV6 stereoscopic microscope and drawings made with the same equipment. Photographic illustrations were done using IM 50 (Image Manager) software and combined using Auto-Montage Pro (Syncroscopy) software. Measurements were made with an ocular micrometer in the SV6 microscope.
For the type label data, quotation marks " " separate different labels and a slash / separates different lines. Text within square brackets [ ] is explanatory and was not included in the original labels. The following abbreviations are used:

BL
body length (from anterior margin of clypeus to posterior margin of tergite IX) BW body width (maximum width of elytra) EL elytral length (maximum) EW elytral width (maximum) HL head length (from anterior margin of clypeus to posterior margin of head disc) HW head width (maximum) PL pronotum length (maximum) PW pronotum width (maximum) All measurements are in millimeters and are based on the holotypes. The terminology adopted for the descriptions follows Irmler (1981, 2011) and Herman (1991.

Depositories
All specimens are deposited in the following collections:  Diagnosis. Neolindus irmleri sp. n. can be distinguished from other Neolindus species by the sternum VIII divided into one central and two lateral plates (Fig. 7).
Head and pronotum moderately flattened dorsoventrally. Head ( Fig. 1) wider (HW: 1.61) than long (HL: 1.02), with acute hind angles. Head disk with umbilicate punctures each carrying a black macroseta and one trichobothrium on lateral side of vertex near anterior third of eye, the umbilicate punctures mainly distributed at posterior edge in transversal line. Epicranium shiny without microsculpture and with micropunctures between umbilicate punctures, micropunctures denser anteriorly. Gula with two long setae near anterior margin. Labrum with large, apically rounded lobe near middle of anterior margin and with smaller, apically rounded lobe near lateral edge of anterior margin. Antennae with scape gradually thickened, pedicel (0.24) shorter than 2.6 times the length of scape (0.63), pedicel and segment 3 similar in width (0.12), segment 3 longer (0.33) than pedicel (0.24), segment 4 (length 0.22 : width 0.14) longer than wide, segment 5 (0.24 : 0.14) longer than wide, segments 6 to 8 longer than wide and identical measurements (0.20 : 0.14), segment 9 longer than wide (0.16 : 0.13), segment 10 quadrate (0.14 : 0.14), segment 10 longer than wide (0.22 : 0.12); segments 4-11 densely covered with microsetae; scape to segment 3 with black macrosetae lacking a defined pattern, on segment 4 to 10 arranged in one ring in the apical region, on segment 11 in a ring in the middle region and one tuft in the apical region. Pronotum ( Fig. 1) wider than long (PL: 1.53; PW: 1.86), with anterior margin straight, lateral margin slightly concave and hind angles rounded. Disk polished and shiny without microsculpture, with longitudinal row of 7-9 punctures on each side of midline; several punctures on lateral to paramedial row of punctures; rare micropunctures homogeneously distributed. Elytra (Fig. 1) slightly wider than pronotum (EL: 2.08; EW: 1.96) with epipleural ridge; surface polished and shiny, with irregular rows; with black macrosetae.
Legs uniformly covered with glossy black macrosetae; segments 1-4 of protarsus strongly bilobate and with yellowish pale setae ventrally.
Abdomen polished and shiny, uniformly punctate; the first segments more strongly punctate than the last. Male with broad and moderately deep, median apical emargination on sternum VII (Fig. 4), posterior margin with small carina on lateral edge of emargination. Segment VIII (Figs. 6-7) with four internal canals at base of tergum and sternum. Tergum VIII ( Fig. 6) with trilobed posterior margin; basal ridge with short median carina. Sternum VIII (Fig. 7) constituted by two lateral plates and one central plate, fused at the base. Central plate with broad, median emargination; the emargination wide apically and strongly narrowed basally, depression margined laterally by longitudinal carinae; each side of depression with additional lateral carinae; basal ridge with longitudinal small grooves and pair of central carinae; between basal and apical carinae is a small carina. Tergum IX ( Diagnosis. Among Neolindus species, N. hermani sp. n. is similar to N. pastazae, in having the three triangular lobes on the posterior margin of tergum VIII (Fig. 13) and antennal segment 10 shorter than 9. Neolindus hermani sp. n. differs from it by the acute lobe on each side of median apical emargination on sternum VII (Fig. 11) and sternum VIII with a large pair of depressions on each side of the central emargination of the apex (Fig. 14).
Head and pronotum moderately flattened dorsoventrally. Head (Fig. 8) wider (HW: 1.90) than long (HL: 1.22), with acute hind angles. Head disk with umbilicate punctures each carrying a black macroseta and one trichobothrium on lateral side of vertex near anterior third of eye. The umbilicate punctures mainly distributed at posterior edge in transversal line. Epicranium shiny without microsculpture and with micropunctures between umbilicate punctures, micropunctures homogeneously distributed. Gula with transverse cluster of numerous setae near anterior margin. Labrum with large, apically rounded lobe near middle of anterior margin and with smaller, apically rounded lobe near lateral edge of anterior margin. Antennae with scape gradually thickened, pedicel (0.20) shorter than 3.8 times the length of scape (0.76), scape (0.14) wider than pedicel (0.11), segments 3-11 longer than wide and with identical width (0.10), segment 3 (0.47) longer than pedicel (0.20), length segments 4 and 8 (0.31), length segments 5 and 6 (0.35), length segment 7 (0.33), length segment 9 (0.24), length segments 10 and 11 (0.20); segments 3-11 densely covered with microsetae; scape and pedicel with black macrosetae lacking a defined pattern, on segment 3 to 10 arranged in one ring in the apical region, on segment 11 in a ring in the middle region and one tuft in the apical region.
Legs uniformly covered with glossy black macrosetae; segments 1-4 of protarsus strongly bilobate and with yellowish pale setae ventrally.
Abdomen polished and shiny, uniformly punctate; the first segments more strongly punctate than the last. Segments VII and VIII with microsculpture between punctures.
Male with broad and deep median apical emargination on sternum VII (Fig.  11), posterior margin with lobe on lateral edge of emargination; surface adjacent to emargination with shallow median depression. Segment VIII (Figs. 13-14) with four internal canals at base of tergum and sternum. Tergum VIII (Fig. 13) with three triangular, apically acute lobes on posterior margin, apex of central lobe longer than lateral lobes; basal ridge with short median carina; surface with slightly midlongitudinal carina on apical portion of median lobe; Sternum VIII ( Fig. 14) with large pair of depressions on each side of central emargination of apex. Tergum IX (Fig. 12) fused medially and with long black setae. Aedeagus as in Figs. 9-10; parameres symmetric and fused to median lobe; with broad, deep median apical emargination; ventral side with median carina in front of basal foramen; apex of median lobe with many sclerites exposed.
Female with characters of head, pronotum, and elytra as described for male. Abdominal sterna VII and VIII with posterior margin emarginated.
Etymology. This species is named in honor of Dr. Lee Herman of the American Museum of Natural History, USA.

Key to the males of Neolindus species
The Peruvian species N. amazonicus, N. hanagarthi and N. peruvianus described for Irmler 1981 are excluded from the key because they are known only from females.

1
Head with one pair of trichobothria ( Fig. 64 (Herman 1991;Fig. 140) with posterior margin truncate and with internal canals at base, segment III with one pair of paratergites; aedeagus with apex of median lobe emarginate (Fig. 141