436 BULLETIX 18 2, UNITED STATES NlATIQiNAL MUSEUM 



cavities entirely open beliind ; front coxae large, exserted; posterior 

 coxae contiguous, "triangular,"' sometimes with a small expansion 

 over the base ol" femur; fiist and second abdominal sternites absent; 

 intersegmental membranes of abdomen nuirked with a pattern of 

 irregular rounded sclerotized areas arranged in longitudinal bands; 

 femora unarmed. 



Remarks. — As far as I can determine this genus has always been 

 ascribed to Stephens (1832) who was the first to give a diagnosis 

 of it. It was, however, validated by Mannerheim in 1830 and by 

 Stephens in 1829 by the listing of several valid species, and may have 

 been used even earlier. The genus is readily recognized by its habitus 

 as well as by its littoral habits. 



Koch (1936) has partially revised the genus, although a false im- 

 pression of completeness is given by his paper, which entirely omits 

 mention of over 15 described species or names. It should be pointed 

 out also that there is apparently an error in the key at couplet 25 

 and 30. The subgenus Remus apparently can be distinguished from 

 only part of the subgenus Pseudorenius. 



I have examined 171 examples from the West Indies and assign 

 them to three species, all previously described. 



KEY TO WEST INDIAN SPECIES OF OAFIUS 



1. Head with deeply impressed median line anteriorly 2. caribeanus 



Head without impressed median line anteriorly 2 



2. Pronotuni with series of punctures along sides of median space. 



3. bistriatus 

 Pronotum without single series of punctures along sides of median space. 



1. subtilis 

 1. CAFIUS SUBTILIS Cameron 



Capis subtilis Cameron, 1922, p. 121.— Scheerpeltz, 1038, p. 1370.— Bierig, 1934a, 



pp. 65, 66. 

 Cafius sa-iccns var. suhtilis Cameron, Koch, 1936, p. 192. 



Descriptioih — Black, pronotum sometimes picescent, elytra and 

 abdomen castaneous. Head quadrate, not enlarged behind eyes but 

 with basal angles moderately rounded; eyes separated from base by 

 about one-half more than their length; without any longitudinal im- 

 pressions on vertex ; with moderately coarse and somewhat umbilicate 

 punctures (not impressed) scattered rather densely except along 

 middle; with line and dense scaly ground sculpture. Pronotum over 

 one-fifth longer than wide, widest in anterior fifth, thence scarcely at 

 all narrowed to narrowly rounded posterior angles; disk with median 

 band impunctate but not outlined by punctures that are distinctly 

 serial; punctures at sides moderately densely and evenly scattered 

 with scaly ground sculpture more distinct than on head. Eh/tra with- 

 out punctures but w^th dense tuberculat« sculpture with minute and 



