16 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



above middle or unbroken; legs long, femora, especially the front 

 pair, most frequently stout, last tarsal joint, claws and onychia large, 

 claws in female with a large basal lobe or tooth, in male simple. 

 Abdomen from short ovate to siblinear or long subclavate; first ter- 

 gite usually sessile with prominent dorsal carinae, rarely subpetio- 

 late with carinae distinct only at extreme base; middle tergites usu- 

 ally with distinct lateral elevations or with a median rhomboid area 

 set off by grooves; ovipositor short, rarely half as long as abdomen, 

 and with a distinct ventral swelling at or near the middle, whence it 

 tapers to a very acute point ; hypopygidium retracted far from apex 

 of abdomen. 



KEI TO GENERA. 



1. Eyes and ocelli very large, posterior ocelli nearly touching the eyes, which are 

 strongly emarginate, malar space practically obliterated; temples very flat or 

 even concave and strongly convergent toward the unusually strong, flang-like 

 occipital carina; clypeus subemarginately truncate (see fig. 1); long slender 

 species mostly light colored, "vrith abdomen parallel-sided or subclavate, slender 

 legs, and fasciate winga (see pi. 2, fig. 1.) Eymenoepimecis Viereck. 



Fig. 1.— Hymenoepimecis wiltii (cresson). a. 

 Dorsal view of head; b, clypeus and mandi- 

 bles. 



Eyee and ocelli not especially large,po8terior ocelli widely separated!; from eyes, 

 malar space distinct; temples usually slightly convex and less strongly conver- 

 gent, occipital carina not espedially strong; clypeus usually rounded at apex, 

 rarely obscurely truncate (see fig. 2); shorter, stouter, darker colored species, 

 with abdomen, at least in female, with sides usually arcuate, with stouter legs, 

 shorter ovipositor, and hyaline, unfasciate wings (see pi. 2, fig. 2 and fig. 5.) . . 2. 



Fig. 2.-0, Polysphincta burgessi cresson. Dor- 

 sal VIEW OF head; b, polysphincta (zatypota) 

 braucheri cushman. Clypeus and mandibles. 

 2. All tergites beyond second with furrows, impressions, and elevations obsolete; first 

 tergite very narrow, nearly parallel-sided; stigma very narrow, its posterior 

 margin curved, radius originating far before the middle; eyes rather small, 



shorter than width of frons Acrodactyla Haliday. 



Tergites beyond second with either furrows, impressions, or elevations distinct; 

 first tergite broader, its sides divergent; stigma broader, its posterior margin 

 angulate at origin of radius, which is usually not far before the middle; eyes 

 longer than width of ^rons.. 3. 



