1983] 
Burnham — Geraridae 
39 
and was therefore lost. Base and anal area of the hind wing also 
missing. Wings are separated and almost at right angles to one 
another. 
Synonymies 
Genentomwn carri USNM 65023. Obverse half. This insect is an 
impression of the wings only. Although the wings do overlap, the 
fore wing on the right side and the hind wing on the left side are 
visible. 
I am synonymizing Genentomum carri with Genentomwn validum. 
Cockerell (1917) described this specimen as a new species on the 
basis of R which he figured with a single anterior branch. After close 
examination of the holotype, I find that he was incorrect in his 
interpretation of this vein as a branch of R. Either it is a very weak 
cross vein, or a wrinkle in the wing membrane. Branching pattern of 
RS in both fore and hind wings is similar to G. validum, and M is 
virtually identical in both. 
The following genera and species are described from single 
specimens (most from single wings). Their descriptions are therefore 
somewhat approximate. There seems to be no justification for 
removing any of these taxa from the Geraridae at this point, 
although the discovery of more nearly complete specimens may 
provide characters that will alter this arrangement. 
Genus Progenentomum 
Progenentumum Handlirsch 1906a: 145, I906b:70I, 1919:40. 
Description 
Fore wing: SC terminates in C at point two-thirds distance from 
wing base to apex; R parallel to anterior margin of wing, fusing with 
margin just before wing apex; RS pectinate with several branches; 
M more branched than RS and elbowed distally, touching RS at 
that point; branches of RS and M close to one another and parallel; 
numerous cross veins present; CUA, CUP, and anal region not 
known. 
Hind wing: unknown. 
Diagnosis 
Progenentomum is close to Gerarus but separated from it by RS, 
which has at least four branches in the fore wing. Compare with 
Genentomum. 
