MONOGRAl'H OF THE NORTH AMKKICAN PKOCTOTRVPID.E. 385 



The only yeiieia, i>rol)abl.v, that woiihl jiive the student troiihh^ in 

 l>lacing, are iSi/nacrti and I'ohipeza. TXw first mentioned was oiij^jinally 

 phioed by PTnster in tlie Ilrli/tinw, as the venation is more stronjrly de 

 veloped than in any other Diapiiid, and the al)(h>men is shaped as in 

 many of tiie Belytids, but there is no hosnl ct-ll in the hi ml irintfs. 



Litbonceiida Westw., Thes. Ent. Oxon., p. 171, is not included in the 

 table of genera, as I believe it to b«^ a Cynipid genus. 



While comparatively little is yet known of the habits of the greater 

 number of the Diaprina., from such as have beea reared we are justi- 

 fied in stating the group is jiarasitic otdy on Dipterous larva*, as all 

 carefully bred specimens, both in Europe and America, have been 

 reared only from these insects. Piopria meUinovorjipha iJatz. is re- 

 cohUmI as having been bred from ('rifpforhynchus hqntfhi, and EntomociH 

 vordipennmYmstevhinn a spider's nest; but we know now that various 

 Dipteia are frmnd in the burrows of Khynchophora and other wood- 

 b<uing Coleoptera and that certain Diptera, 'copis, etc., are jiara- 

 sites of spiders, and it is sate to infer tiiat these niapriids came from 

 Dipterous parasites overlooked by Katzeburg and Fiirster. 



The group may be divided conveniently into two tribes, as follows; 



Siibiiiarginal vein roach ingtho costa at about half the h-ngtli of the wing or a little 

 Itefore; if it dctesnot reach the costa it attains nearly half the length 

 of wiug and euils in a stigma; costal cell mosttrecincntly closed. 



Tribe I — Hi'ir.oMic RiNi 



Siibmargiual vein never reaching the costa beyond ois. -third the length of the wing; 

 costal cell most fre(iuently open, or the subcosxal and costal iicrvnres 

 are coutlnent Tribe II — Diavkiini 



Tribe I — Spilomicrini. 



The longer submarginal vein, that almost invariably rejiches the costa 

 at about half its length, and the closed (rarely opeji) costal cell cau be 

 depended upon to distinguish the genera iu this tribe; it is only in 

 two genera, Aneurhynchm and Laholips, that the submarginal vein does 

 not reach the costa, but even iu these genera it is long and terminates 



in a stigma. 

 The genera are not numerous and may be synoptically represented 



as follows : 



TABLE OF GENERA, 



FEMALES. 



1. Antennte 14-.joiuted ; mesonotuui with 2 furrows Polypeza Fiirster 



AntenuiP 12-jointed 3 



AntenuiB 13-jointed. 



Mesoiiotiim without furrows (rarely slightly developed posteriorly) 2 



Mesonotuiu with 2 distinct furrows. 



Metathorax armed with a long curved spine at base Hoplopria Ashm. 



--—. Metathorax not armed at base with a curbed spiue. ^. ,. ■ 



Basal nervure absent or subobsolete. 



Abdomen rounded or trun«ate at tip ; costal cell open ; stigmal vein often 



with a backward directed branch Hemilkxis Forst. 



Abdomeu conically pointed | costal cell closed; stigmal vein simple. 



Paham&sius Westw, 



21899— No. 45—25 



