460 PROCEEDINGS OF THE \ ITIONAL MUSEl 1/. vol.38. 



Genus OSTEULCUS Burr. 



1. KERVILLEI Burr. 



Vt m '-U, hi . Merida, one female. 



Subfamily OPISTHOCOSMIIN^E. 

 PI LEX, new genus. 



Antenna 1 '. (only the basal segment remains; this is short and stout.) 



I lead tumid, eves very large. 



Pronotum subquadrate; about as wide as the head and wider than 

 long, and a lit lie broader posteriorly than anteriorly. 



Elytra and wings well developed, ample, the former not carinate. 



Legs long; first tarsal segment cylindrical, about half as long again 

 as the other two united; second broad, but distinctly longer than 

 broad ; third longer t han t he second, but only about half as long as the 

 first, rather broad. 



Abdomen broad, depressed, subparallel. 



Last dorsal segment ample, rectangular, transverse about twice 

 as broad as long. 



Pygidium distinct, obtuse, transverse. 



Forceps with branches remote ;it the base, elongate. 



This genus is erected for Opisthocosmia bogotensis Rehn, which falls 

 into the group with uoncarinate elytra and broad pronotum; the 

 short third segment of the tarsi connects it with Eparchus, Hypurgus, 

 and Slcalistes, but the depressed body, and transverse last dorsal seg- 

 ment , distinguishes it easily. 



1. BOGOTENSIS Rehn. 



Colombia. Bogota (G. Klages, Cat. No. 8166; Rehn, 1905, p. 511, 

 fig. 3). 



This species is figured and well described by Rehn. It lias a num- 

 ber <>f peculiarities which make it easily recognizable. The asperities 



of the forceps and last dorsal segment, 

 the anchor-shaped depression in the 

 latter, the build and form of forceps, 

 together with the generic characters, 

 are very dist incl ive. 



The second segment of the tarsi is 

 scarcely lobed, merely a little dilated 

 Fro. i.-ui.M. leg of in.. i ssis. toward the apex, scarcely more so than 



t he third segment ; this is a very si rik- 

 ing contract to certain species of Eparchus, as /•'. luij(iis, where the 

 second segment is almost circular and the third slender. 



The large and prominent eyes are very noticeable; as they almost 

 reach the posterior angles of the head, they have an archaic character, 

 recalling t he fossil genu- Labiduromma. The type in the U.S. National 

 Museum is the only known specimen dig. 4). 



