336 BULLETIN" 182, LTNITED STATES NATIONAL MUSEUM 



with a concavity lined with diagonal ctenidia ; apex of posterior tibia 

 with a ctenidium on each side. 



ReTTiarhs. — This genus is very similar to Homoeotarsus but it is 

 distinguished by the absence of the pleural fold. From Ochthe- 

 philuvi it differs by lacltiiig denticles on the labrum. 



From the West Indies I have seen 98 specimens, representing nine 

 species, of which eight appear to be new. 



KEY TO WEST INDIAN SPECIES OF BIOCRYPTA 



1. Ej'es moderately small, separated from base by not over three times their 



diameter; elytra normal 2 



Eyes very small, separated from base by at least four times their diameter; 

 elytra reduced 5 



2. Vertex with dense ground sculpture 1. darlingtoni 



Vertex between the eyes at most with traces of ground sculpture 3 



3. Head longer than broad ; sternites of female unmodified ; fif tli steruite of 



male with a very large circular fovea 4. dominicana 



Head as broad as or broader than long; fifth sternite of female generally 

 modified ; fifth sternite of male with at most a moderate fovea 4 



4. Head impunctate along center of vertex ; punctures seldom separated by less 



than their diameter 3. trinitatis 



Head more or less punctate throughout; punctures usually separated by less 

 than their diameter 2. fulvipes 



5. Eyes minute, separated from base by about eight times their diameter. 



9. hispaniola 



Eyes very small but separated from base by only about four times their 



diameter 6 



6. Disk of pronotum finely coriaceous but without distinct ground sculpture 7 



Disk of pronotum with distinct ground sculpture, not at all coriaceous 8 



7. Head distinctly swollen behind eyes 5. haitia 



Head scarcely at all swollen behind eyes 8. janiaicensis 



8. Head between the eyes v.ith dense ground sculpture 7. densa 



Head between eyes without ground sculpture 6. cubensis 



1, BIOCRYPTA DARLINGTONI, new species 



Descnption. — Rufopiceous, the pronotum black, posterior margiii 

 of elytra rufotestaceous. Head with eyes at twice their length from 

 base, at their length from apex; basal segment of antennae nearly 

 two-thirds as long as head, as long as distance between them; an- 

 tennal grooves distinct; with moderate punctures and a few very 

 coarse ones between the eyes ; with very fine and dense ground sculp- 

 ture througliout. Pronotum with distinct and slightly elevated 

 smooth median band set off by fairly regular series of punctures; 

 rather coarsely and fairly densely punctured ; without ground sculp- 

 ture. Elytra much larger than pronotum; with dense moderate 

 punctures separated by convex intervals, not distinctly serial ; without 

 ground sculpture. MaJe^ fourlh sternite with a slightly elevated 

 transverse fovea occupying middle seventh of the width ; fifth sternite 



