MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 273 



a snicall and abrupt emargination, deeper than wide, the apex rectangu- 

 lar, without denticles; gular sutures narrowly separated, feebly con- 

 A'erging posteriorly; with fine and dense but very distinct umbilicate 

 ^junctures interspersed with a few nnich larger ones, the intervals 

 narrow but flat and with ground sculpture at sides basally. Pronotum 

 about one-sixth wider than long, only a trifle narrower than head; 

 sides rather strongly converging and rounded into base; disk not 

 impressed along midline; midline not smooth or canaliculate: with 

 dense umbilicate punctures of two sizes as on head; without distinct 

 ground sculpture. Elytra with rather dense submuricate punctures 

 obscured by coarse rugosity of the surface; with long pubescence. 

 Ahdomen very finely and densely punctulate, with indistinct ground 

 sculpture. Male, sixth sternite with anterior plica extended at middle 

 to make a narrow elevated median ridge which projects as a blunt 

 process at posterior margin; seventh sternite transversely impressed 

 and broadly emarginate; eighth with a large excision, deeper than 

 wide, wider just inside the apical angles. Feinale, sternites unmodified. 

 Length, 5 to 6 mm. 



Type locality. — Dominican Republic, Sanchez. 



Types. — Holotype, male, and five paratypes in the Museum of Com- 

 parative Zoology; five paratypes in the United States National Mu- 

 seum (No. 52512), collected in July 1938 by Dr. P. J. Darlington. 



Records. — The following are the records known to me : 



Hispaniola: Haiti, Etang Lachaux (Darlington, in M.C.Z. and U.S.N.M.) ; 

 Dominican Republic, Sanchez (Darlington in M.C.Z. and U.S.N.M.). 



Specimens exammed. — I have seen only the 11 types. 



Remarks. — This is the largest Med&n known to me. It is very dis- 

 tinct by the male characters, in which it differs greatly from M. 

 raatasana, which is its closest neighbor geographically as well as 

 zoologically. It probably belongs in the subgenus Medon s. str. 



I have received no record of its habits. 



4. MEDON TRINITATUM, new species 



Description. — Piceous, elytra and abdomen piceocastaneous, ely- 

 tron with a triangular pale spot at outer apical corner extending 

 to suture and to middle of side. Head one-fifth wider than long, 

 base emarginate only above the neck, sides parallel and rather nar- 

 rowly rounded into base; eyes large, at about their length from 

 base; labrum with a small abrupt emargination, scarcely as deep as 

 wide, without denticles; gular sutures obsolescent, feebly divergent 

 from near front; with moderately coarse umbilicate punctures sepa- 

 rated by one-half to once their diameter; without ground sculpture. 

 Pronotum one-eighth wider than long, as wide as head ; sides moder- 

 ately converging behind and rounded into base; disk not impressed 



