MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 329 



Specimens examined. — I have seen 23 examples in the British Mu- 

 seum, 31 from tlie Museum of Comparative Zoology, 3 in the United 

 States National Museum, and 59 I collected during 1935-37. 



Remarks. — This is a variable species both in color and puncta- 

 tion. The latter varies in arrangement and somewhat in density, 

 but very little in the size of the punctures. The dimorphism of the 

 male is similar to that observed in North American species of Gas- 

 trolohium, to which subgenus this species belongs. 



I have collected this species from under stones at the edge of 

 streams. 



3. HOMOEOTARSUS OBSOLESCENS. new species 



Description. — Black, anterior and posterior margin of pronotum 

 and elytra more or less rufescent. Head with moderate punctures, 

 each more abrupt posteriorly, narrowly separated basally but by 

 about their diameter on vertex and still more sparsely in front; with 

 very dense and very strong ground sculpture throughout ; eyes in front 

 of midline, at over twice their length from base; basal segment of 

 antennae not quite so long as distance between antennae. Pronotfum 

 with irregular median smooth stripe, rest with coarse irregular punc- 

 tures generally very dense but sparser at sides; without ground 

 sculpture. Elytra with coarse deep punctures separated by convex 

 intervals, with no trace of serial arrangement ; without gi'ound sculp- 

 ture. Male dimorphic, fourth sternite with a distinct fovea, fifth 

 with only a trace of a setigerous fovea, not lobecl, or with a broad 

 rounded triangular lobe reaching to the seventh sternite. Female^ 

 sternites not modified. Length, 7 to Si/^. mm. 



Type locality. — Trinidad, 3 miles northeast of St. Augustine on the 

 Tacarigua River, county of St. George, ward of Tacarigua. 



Types. — Holotype, male, and one paratype, female, U.S.N.M. No. 

 52425, collected by me on December 22, 1935; two paratypes in the 

 British Museum, one from Caparo and one labeled merely Trinidad ; 

 two paratypes from Tobago in the United States National Museum, 

 and five paratypes from the Museum of Comparative Zoology. 



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



Tobago: (Blackwelder station 119). 



Trinidad: (Birch, in B.M.), Tacarigua (Blackwelder station 107A), Caparo 

 (Klages, in R.M.), St. Augustine (Darlington, in M.C.Z. and U.S.N.M.). 



Specimens examined. — I have seen two specimens in the British 

 Museum, five from the Museum of Comparative Zoology, and four 

 collected by me in 1935-37. 



Remarks.- — The examples in the British Museum were labeled 

 CryptoMiim marginellum Bnhr. and Gryptohimn assimile Er., the 

 former apparently in the handwriting of Dr. Bernhauer. They ap- 

 pear to me to differ from the descriptions of those species and to 



449008 — 42 22 



