MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 201 



or sinuate behind, the hind angles rather broadly rounded; lateral 

 margin not abrupt but much wider posteriorly; disk slightly flat- 

 tened medially in front but midline not smooth; with minute irregular 

 punctures, and with distinct ground sculpture medially. Elytra 

 closely appressed to body, almost as wide as pronotum, nearly one- 

 fourth wider than long, scarcely expanded posteriorly; without dis- 

 tinct punctures or sculpture but surface both coarsely and finely 

 coriaceous. Abdomen with sparse and rather fine punctures and a 

 few larger muricate punctures; with alutaceous lustre. Anterior face 

 of front tibia without visible setigerous punctures. Length, 2l^ mm. 



Type locality. — Trinidad, Aripo Valley, elevation 2,000 feet. 



Types. — Holotype, Museum of Comparative Zoology, collected by 

 N. A. Weber on April 19, 1935. 



Records. — The following is the only record known to me ; 



Trinidad: Aripo Valley (Weber, in M.C.Z.). 



Specimens examined. — I have seen only the holotype. 



Remarks. — This is another species like weben., which has the elytra 

 small and closely applied to the body. It has the aspect of a subter- 

 ranean beetle. It is distinct by its labrum and impunctate tibiae 

 from all save webeH and micropterus and from these by the absence 

 of the medium pronotal groove. It is distinct from microptems 

 further by the shape of the clypeus. 



The type was taken in a cave. 



33. OSORIUS MICROPTERUS, new species 



Description. — Testaceocastaneous. Head as wide as pronotum; 

 eyes small, not very prominent though abrupt ; clypeus a broad 

 smooth semicircular lobe ; labrum broadly rounded, indefinitely sculp- 

 tured; outer antennal segments broader than long; with sparse and 

 irregular but distinct moderately coarse punctures; with ground 

 sculpture behind the eyes but only very vaguely on the disk. Pro- 

 notum one-tenth wider than long, strongly narrowed posteriorly, 

 apex nearly one-half wider than base ; sides very feebly but regularly 

 arcuate; basal angles scarcely evident; disk rather deeply impressed 

 along midline almost to base, without very distinct punctures but 

 with faint traces of ground sculpture which appears to be in part 

 composed of minute punctulae. Elytra closely appressed to body, 

 just wider than the pronotum, not quite as long as wide; feebly en- 

 larged near middle; surface coarsely uneven but without distinct 

 punctures or tubercles on the disk; finely but irregularly coriaceous 

 with traces of ground sculpture. Abdomen with isolated shallow 

 punctures; shining along midline but laterally with faint coriaceous 

 ground sculpture. Anterior face of front tibia without visible seti- 

 gerous punctures. Length, ly^ nim. 



449008 — 42 14 



