Xenopygus

Caron, Edilson, De Castro, Jessica C., Da Silva, Maycon R. & Ribeiro-Costa, Cibele S., 2016, Phylogeny and revision of a colorful Neotropical genus of rove beetles: Xenopygus Bernhauer (Coleoptera: Staphylinidae), Zootaxa 4138 (1), pp. 59-82 : 65-66

Key to the species of Xenopygus

1. Antenna with microsetae on antennomeres IV to XI; antennomere IV longer than wide, pronotum with setal punctuations evenly distributed, not on the median longitudinal line (Fig. 11–13); sternite VII of male without porous structure......... 2

- Antenna with microsetae on antennomeres V to XI ( Fig. 14 ); antennomere IV as long as wide ( Fig. 14 ), pronotum with setal punctuations forming a pair of longitudinal parallel lines in the median region and distributed in the lateral thirds (Fig. 5–7); sternite VII of male with porous structure (Figs. 30–32)...................................................... 4

2. Tergite V with arched carina.................................................................. X. cordovensis

- Tergite V without arched carina.......................................................................... 3

3. Median lobe with only one large tooth in the apex ( Fig. 49 ); paramere with rounded apex and peg setae along its margin (Fig. 55)............................................................................. X. sancticamillus , sp. nov.

- Median lobe with more than two somewhat small teeth near the apex ( Fig. 50 ); paramere with thin apex and peg setae forming two parallel columns (Fig. 56).......................................................... X. petilicolis , sp. nov.

4. Head and pronotum of the same color as elytra, metallic blue to green, sometimes with elytra slightly darker, and abdominal

segment VII entirely yellowish or at least ligther than the precedents ( Fig. 2 ); scape evidently shorter than antennomeres II and III combined................................................................................... X. analis - Head and pronotum of different color that elytra and abdominal segment VII not entirely ligther than the preceeding segments ( Figs. 3, 4 ); scape slightly longer than antennomeres II and III combined.......................................... 5

5. Apical half of abdominal segment VI and basal half of segment VII evidently darker than remainder of abdomen ( Fig. 3 ); sternite VIII of male with apical margin slightly emarginate at middle (Fig. 34)............................... X. bicolor

- Only basal half of abdominal segment VII evidently darker than remainder of abdomen ( Fig. 4 ); sternite VIII of male with apical margin strongly emarginate at middle (Fig. 35)................................................... X. confusus

Figures

FIGURES 14 – 19. Xenopygus analis. Scanning electron microscopy based on the male. 14, antenna detail; 15, left mandible; 16, right mandible; 17, left maxilla; 18, labium; 19, head in ventral view: a) infraorbital ridge, b) postgenal ridge, c) ventrobasal ridge, d) postoccipital suture.

FIGURES 48 – 50. Aedeagus, lateral view. 48, X. cordovensis, paramere removed; 49, X. sancticamillus, sp. nov.; 50, X. petilicolis, sp. nov., paramere removed. 51 – 53. Apex of median lobe, ventral view. 51, X. cordovensis; 52, X. sancticamillus, sp. nov.; 53, X. petilicolis, sp. nov. 54 – 56. Apex of paramere, dorsal view. 54, X. cordovensis; 55, X. sancticamillus, sp. nov.; 56, X. petilicolis, sp. nov. Scale = 0.5 mm.

FIGURES 2 – 4. Habitus. 2, Xenopyugs analis; 3, X. bicolor; 4, X. confusus. 5 – 7. Detail of head and pronotum. 5, X. analis; 6, X. bicolor; 7, X. confusus. Scale = 2 mm.