ASHMEAD : CLASSIFICATION OF THE CIIALCin FLIES 247 



over tlie dorsum of tlie abdomen, often reacliing to tlie scutelluin, and in haviiij^; 

 the wings longitudinally folded as in the \'<spid;v, KumcnkUv and in the Diapriid 

 genus Galesus. 



The group is parasitic in the nest of heos and the longitudinal fold in the wings 

 is significant, for the leucospid is thus enabled to crawl into the nest of a bee without 

 seriously disturbing its contents. 



The group was monographed by Dr. August Schletterer in 1890, in the Berliner 

 Entomologische Zeitschrift, vol. 'A'). This work should Ije in the hands of all stu- 

 ents who desire to study these insects. 



TABLE OF GENERA. 



1. Froiis anteriorly not cormited ; hind margin of the head not curved inwardly ; thin! joint of antenna; at 



least as long as the second, usually, however, distinctly longer ; pronotum anteriorly as broad as 



behind ; scutellum never cordate 2 



Frons anteriorly bicornuted ; hind margin of the head curved inwardly ; third joint of antennie smaller 

 than the following ; pronotum narrowed anteriorly ; scutellum cordate. 



Marres Walker (type ^f. dicomas Walker). 



2. Abdomen more or less compressed, rounded or vertically angular posteriorly, but never pointed ; 



ovipositor extends from beneath the venter and curves over the tip of the abdomen backwards, 

 reposing upon the dorsum, sometimes extending to the scutellum ; hind coxse without a tooth above ; 



maxillary palpi distinct, 4-jointed 3 



Abdomen more fusiform and not distinctly comjjressed, the paniuh followe<l to the dorsum, with a 

 long channel and with the apex i)ointed ; ovipositor confined to the under surface of the abdomen 

 and not extending further than to its tip ; hind cox:e with a strong erect tooth above ; maxillary 

 palpi 3-jointed, short and slender Polistomorpha Westwood (type P. gurinnmenfis Walker). 



3. Front coxaj not especially long, much shorter than their femora, the tibia as long as tlie femora ; 



middle tibia; without a tooth at apex ; hind tibia; at apex normal, with 2 spurs. 



Leucospis F'abricius (type L. dorsigera Fabricius). 

 Front coxa; veiy elongate, nearly as long as their femora, the tibiae shorter than the femora ; middle- 

 tibi;e with a tooth at ai)ex ; hind til)ia; curved and acutely produced into a spine at apex. 



Exoclsenus Shipp (type Leucospis anihidioidf» Westw.). 



SUBFAMILV II. ClIALCiniN.E. 



1835. Cluilcididie, Family, Walker, Ent. Mag., II., p. 20. 



1839. Chalcididte, Family XVI., Haliday, Hym. Bynop., p. ii. 



1856. Chalcidoida?, Familie, Forster, Hym. Ptud., ii., p. 29. 



1897. ( 'hulcidina-. Subfamily II., Ashnicad, Proc. Knt. Soe. Wash., IV., p. 247. 



In having the hind femora greatly swollen and usually dentate or serrate, this 

 subfamily agrees with the Laicospidino', but differs in having the front wings not 

 folded longitudinally in repose, by having a much smaller pronotum, and quite a 

 different shaped abdomen, the ovipositor, when prominent, being straight and never 

 curved forward over the dorsum. 



