430 
MEXICAN DERMAPTERA 
the male before us, and does not have two minute, internal, 
slender, rounded projections on each branch of the forceps, one 
ventrad at the pygidium, the other dorsad a distance caudad 
equal to the pygidial width, as in this specimen. In other re- 
spects the material before us is typical. We do not believe that 
presence or absence of wings, or such differences from the type 
as shown by the male at hand, will be found of specific diagnostic 
value in this or other species of the present group. 
The remarkably produced and decurved fifth to seventh dorsal 
segments of the male abdomen are a striking feature in males of 
this species. The pronotum differs from that of A. spinax in 
having the latero-caudal angles indicated, the margin from the 
latero-cephalic angles not being evenly convex as in spinax. 
This is one of the best features to separate females of uncinatus 
and spinax, which are very similar in general appearance. 
