Xanthocomus, Guillebeau, 1893

Gimmel, Matthew L., 2011, Review of the species described in Leptostilbus Casey in North America (Coleoptera: Phalacridae: Xanthocomus Guillebeau), Insecta Mundi 2011 (188), pp. 1-8 : 2

Key to North American species of Xanthocomus

1. Second and third elytral intervals with irregular row of punctures, interval punctures nearly the same size as strial punctures (best observed at about midpoint of length of elytra, Fig. 3 ); male hind tibial spurs stout, directed away from tibial axis at a distinctly greater angle than inner hind tibial spines; parameres with only a median longitudinal suture, without median cleft ( Fig. 5 ); apex of penis with median obtuse point ( Fig. 6 ) ......................... X. rutilans (Casey)

— Second and third elytral intervals without row of punctures or with only faint traces of punctures ( Fig. 4 ); male hind tibial spurs slender, directed away from tibial axis at same angle as inner hind tibial spines; parameres with wide median cleft ( Fig. 7 ); apex of penis with median acuminate point ( Fig. 8 ) ........................................................................................... X. concinnus (Casey)

Figures

Figures 1-4. Xanthocomus spp. lectotype labels and dorsal habitus. 1,3) X. rutilans (Casey). 2,4) X. concinnus (Casey).

Figures 5-8. Aedeagus of Xanthocomus spp. 5-6) X. rutilans (Cameron Co., Texas). 5) Tegmen, ventral aspect. 6) Penis, ventral aspect. 7-8) X. concinnus (West Feliciana Par., Louisiana). 7) Tegmen, ventral aspect. 8) Penis, ventral aspect. Scale bars = 0.5 mm.