1326 
REVISION OF THE GENUS HETERONYX, 
“ ventral series.” These are usually soft hairs, but in a few 
species they are very strong stout bristles ; and as they are in 
some species confined to the sides of, and in others run all across, 
the segments, they furnish a valuable key to the distinction of 
species. 
The latei’al edges of the prothorax and elytra* ax-e in all cases 
(so far as I have observed) friixged with a I’ow of bristles or stout 
hairs, very different from the pilosity that clothes the upper surface 
in many of the genus. This I call the “ latei’al fi’inge.” It will 
be oUserved in most species to be entii-ely wanting on the apical 
margin, but in some it is continued there, and when that is the 
case it is oi’dinarily doubled or trebled {i.e., thei’e are two or 
three I’ows one behind another), and the individual hairs or 
bi istles ai’e stouter than those on the sides. 
The hind femora vai’y greatly in shape. In some species the 
outline immediately before the inner apical angle is sti’ongly and 
angulai’ly pi’oduced (forming a kind of tooth), which in other 
species is enfeebled almost to the degi’ee of total disappearance. 
The claws are, in all cases I think, appendiculate I’ather than 
bifid in the sti’ict sense, but as there is a considei’able variation 
in the appendiculation and the tei’m “ bifid ” has been used in 
many existing desci’iptions, I shall continue to use this latter 
term for those claws in which the inner apex of the basal portion 
(immediately in front of the appendiculation) is pi’oduced in a 
well-defined manner and in a direction more or less at a i-ight 
angle to the longitudinal outline of the claw ; and shall speak of 
this pi'oduced piece as the “ lower,” and the portion of the claw 
Ixeyond it as the “ upper ” lobe. 
The other characters referred to in my descriptions do not, I 
think, I'equire preliminai-y explanation. 
The sexual distinctions ax'e not very noticeable, and do not 
appear to be readily available for distinguishing species. In the 
*On the elytra these fringes are inserted in the epipleural portion, which 
in this genus is scarcely at all turned under except at the extreme base. 
