300 BULLETIN 182, UNITED STATES NATIONAL MUSEUM 



under the coxae as far as the inllexed sides ol' the proimluiii'* is mis- 

 leading. Even in views from directly above or behind these lateral 

 expansions do not reach laterally nearly as far as the hypomera, in 

 fact are scarcely at all dilated. In my ke}' (Blackwelder. 1939a) these 

 genera are grouped with those not expanded as far as the hypomera. 



The name Rugilus was validated in 1819 by Samonelle and is there- 

 fore older than Stilicus^ which appears to have been used first in 1825 

 by Lepeletier and Serville. 



The record of Sfilhus crihratiis Sharp from Jamaica by Gowdey, 

 1926, is probably a misidentification. Until the specimens can be 

 reexamined, it must be regarded as a doubtful record. 



This is a world-wide genus of considerable size. It is well repre- 

 sented in America, both temperate and tropical. I have examined IT 

 specimens from the West Indies in the British Museum, 11 in Dr. 

 Cameron's collection, 25 from the Museum of Comparative Zoology, 

 12 in the United States National Museum, and 9 collected by Chapin 

 and Blackwelder in 1935-37. These I assign to seven species, of 

 which two seem to be new. 



KEY TO WEST INDIAN SPECIES OF RUGILUS 



1. Pronotum distinctly punctate only along tho midline 7. coprophilus 



Pronotuni coarsely and strongly nnibilicately punctate throughout, except 



for midline 2 



2. Elytra c(^arsely punctate S 



Elytra finely or indistinctly, not densely punctate 6. insularis 



3. Elytra with coarse separate punctures 1. buscki 



Elytra with dense coarse rugulose sculpture 4 



4. Seventh stcrnite of male emarginate or tuberculate r> 



Seventh sternite of male unmodified 2. jucundus 



5. Seventh sternite of male with simple emargination 6 



Seventh sternite of male with additional modifications 5. chthonus 



6. Seventh sternite of male with rounded emargination one-third as deep as 



wide, angles rounded 3. ag'natus 



Seventh sternite of male with semicircular emargination two-thirds 

 as deep as wide, angles not rounded 4. cupreus 



1. RUGILUS BUSCKI. new species 



Descri'ption. — Black, shining. Ueud scarcely wider than long, 

 rounded behind except for a slight prominence above neck, angles 

 entirely obliterated; eyes large, at less than their length from base; 

 labrum with two very minute denticles at middle, lateral angles 

 indistinctly dentate; umbilicate punctures moderately large, fre- 

 quently elongate, rather dense throughout; without smooth area on 

 vertex; without distinct ground sculpture. Pronotunn one-sixth 

 longer than wide, about three-fourths as wide as head : widest at 

 anterolateral angles; sides scarcely narrowed in front, feebly arcuate 

 posteriorly to base; with a distinct but narrow smooth median band; 



