MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 177 



Specimens examined. — I have studied only the paratype in the 

 United States National Museum and another from the Museum 

 of Comparative Zoology. 



Remarks. — This is the largest osoriine known from the West In- 

 dies and among the largest of the genus. Darlington records that 

 the wings are so reduced as to render the insect flightless. 



The types were taken "in thick damp leaf mold, rotting logs, and 

 under other cover in wet cloud forest." 



2. OSORIUS DARLINGTONI, new species 



Description. — Piceous, frequently rufescent in part. Head about 

 nine-elevenths as wide as pronotum; eyes small, not at all prominent; 

 anterior margin of clypeus slightly emarginate, strongly crenate, 

 the angles not prolonged but tuberculate ; labrum truncate, alutaceous 

 excej3t on declivity; antennal segments not transverse; surface very 

 distinctly alutaceous, with rather coarse sparse punctulae and a 

 few larger punctures. Pronotuin strongly narrowed behind, one- 

 tenth broader than long, base four-fifths as wide as apex; sides 

 scarcely sinuate; side margins somewhat expanded just at base; the 

 basal angles prominent; without shining midline; sculptured and 

 punctured as the head. Elytra one-tenth narrower than pronotum, 

 about one-eighth wider than long, widest at apical third; humeral 

 margins distinctly elevated; strongly coriaceous and with a very 

 few large setigerous punctures. Abdomen distinctly alutaceous 

 throughout. Anterior face of front tibia with scattered setigerous 

 punctures. Length, 9 to 10 mm. 



Type locality. — Cuba, south side of Pico Turqumo, elevation 3,000 

 to 5,000 feet. 



Types. — Holotype and 7 paratypes in the Museum of Comparative 

 Zoology, 6 paratypes in the United States National Museum (No. 

 52487) ; collected by Dr. P. J. Darlington in June and July 1936 at 

 the localities listed below. 



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



Cuba: Pico Turquino (Darlington, in M.C.Z. and U.S.N.M.), Upper Ovando 

 River, Oriente (Darlington, in M.C.Z. and U.S.N.M.). 



Specimens examined. — I have seen only the 14 types and 2 imma- 

 ture specimens. 



Reinarks. — This species is most similar to regulus but differs in its 

 smaller size, in the emargination of the clypeus, the narrower pro- 

 notum, and so on. It represents the extreme development of clypeal 

 crenation in which the crenulae are almost tubercles. 



I have received no record of the habits of this species. 



