1936] 
West Indian Dryopidae 
73 
In addition to the differences in size, proportion, and 
sculpture, there are the following secondary sexual charac- 
ters: antennae and palpi relatively a little more elongate in 
$, but not much modified otherwise; prothorax sexually 
dimorphic in form, also more rounded dorso-ventrally at 
sides in $ , more angulate in $ , especially anteriorly ; meso- 
sternum very compressed between coxae in S , much less in 
$ ; abdomen with 7 ventrals in $ , 6 (apical visible only by 
dissection) in $ ; first ventral rather strongly emarginate 
at middle in $ , much less in $ ; $ with first and second 
joints front and middle tarsi but only first of hind tarsus 
dilated, lobed below at apex, and with pubescent soles; $ 
tarsi slender, as in Psephenus. 
Haiti: holotype $ (M. C. Z . no. 21,787) from Tardieu, 
just north of Mt. La Hotte, about 3,000 ft., Oct. 14, 1934, 
taken at night on a stone in the river with Pheneps gracilis ; 
allotype 9 from a small brook a few miles northeast of Mt. 
La Hotte, about 3,000 ft., Oct. 12, taken by holding a net 
in the current below a leafy sappling which had fallen into 
the brook and which I combed out thoroughly. In spite of 
the differences between these specimens there are so many 
points of exact correspondence — in details of the pale mark 
on the elytra, for instance, and in the faint sub-basal carina of 
the prothorax — that I feel certain they are one species. 
The form of the $ hind tarsus distinguishes this species 
from all other known Psephenops. Possibly the difference 
may eventually prove to be of generic value. 
Subfamily Dryopinse 
5. Hexanchorus caraibus (Coquerel) 
Rev. Mag. Zool. (ser. 2) 3, 1851, p. 601, PL 15, fig. 14 
(Potamophilus) . 
Described from Martinique and Guadeloupe. 
6. Phanocerus congener Grouvelle 
Notes from Leyden Museum 20, 1898, p. 46. 
Grenada: described from Balthazar (windward side). 
This species should be compared with P. clavicornis Shp. of 
Central and South America. 
