320 BULLETIN 182, UNITED STATES NATIONAL MUSEUM 



meii with all visible ventral segments deeply pitted on each side near 

 front, the pit abrupt and flaringly excavated posteriorly, the excava- 

 tion bordered by a distinct cariniform edge which extends half the 

 length of the segment. Male^ eighth sternite truncate with posterior 

 border thickened and raised at both sides of center giving appearance 

 of a narrow median groove, apical median portion of segment flattened 

 and smooth. Female^ eighth sternite truncate but otherwise unmodi- 

 fied. Length, 6i/^ to 7I/2 mm. 



Type locality. — Puerto Rico, El Yiinqu-e, elevation about 3,000 feet. 



Types. — Holotype, male, and one paratype, female, in the Museum 

 of Comparative Zoology; one paratype, male, in the United States 

 National Museum (No. 52499) ; collected in May 1938, by Dr. P. J. 

 Darlington. 



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



Puerto Rico: El Yunqvie (Darlington, iu M.C.Z. and U.S.N.M.). 



Specimens examined. — I have seen only the three types. 



Remarks. — This is a very striking species with a distinctly sub- 

 terranean appearance. The excavations on the abdominal sternites 

 are unique among the staphylinids known to me. It appears to 

 belong in an undescribcd subgenus. 



I have received no record of its habits, but there is a strong pre- 

 sumption that it occurs in ground cover. 



10. LOBRATHIUM PLUVIOSUM, new species 



Description. — Rufous, abdomen slightly picescent. Head with 

 moderately large but very sparse setigerous punctures; without trace 

 of ground sculpture; gular sutures rather widely separated and 

 parallel. Pronotum, one-half longer than head or elytra, one-fourth 

 longer than wide; with an irregular median smooth space not out- 

 lined by series of punctures, punctures sparse and moderate; without 

 trace of ground sculpture. Elytra very small, appressed ; with sparse 

 and rather indefinite punctures not arranged serially; surface some- 

 what uneven but without ground sculpture. Hind tarsus with first 

 segment about as long as second. Abdomen without excavations at 

 the sides of the sternites. MaJe^ eighth sternite with a small rounded 

 emargination and a narrow smooth stripe along the entire midline. 

 Female^ eighth segment narrowly rounded and without smooth 

 stripe. Length, 5 to 51/2 mm. 



2'ype locality. — Dominican Republic, vicinity of Valle Nuevo, at 

 elevation of about 6,000 feet. 



Types. — Holotype, male, and one paratype, female, in the INIuseum 

 of Comparative Zoology; one paratype, male, from Loma de la 

 Pena, northwest of Constanza, in the United States National Museum 

 (No. 52500) ; all collected in August 1938 by Dr. P. J. Darlmgton. 



