MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 385 



The only genera, probably, that would give the student trouble in 

 placing, are Synacra and Poliipezn. The first mentioned was originally 

 placed by Forster in the i>ehjt'ma\ as the venation is more strongly de- 

 veloped than in any other Diapriid, and the abdomen is shaped as in 

 many of the Belytids, but there is no basal cell in the hind a-inf/s. 



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

 table of genera, as I believe it to be a Cyni])id genus. 



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

 number of the IHajrrina; from such as have been reared we are justi- 

 fied in stating the group is i)arasitic only on Dipterous larvae, as all 

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

 reared only from these insects. Diapria melanocorypha Eatz. is re- 

 corded as having been bred from Cri/ptorhi/nchu.s lapatM., and Entomacis 

 cordipcnnis Forstev from a spider's nest; but we know now that various 

 Diptera are found in the burrows oH Rhyuchophora and other wood- 

 boring Coleoptera and that certain Diptera, Leucopis, etc., are para- 

 sites of spiders, and it is safe to infer that these Diapriids came from 

 Dipterous parasites overlooked by Ratzeburg and Forster. 



The grouii may be divided conveniently into two tribes, as follows : 



Submargiaal veia reaching the costa at about half the length of the wing or a little 

 before ; if it does uot reach the costa it attains nearly half the length 

 of wing and ends in a stigma ; costal cell most frequently closed. 



Tribe I — Spilomicrini 



Submarginal vein never reaching the costa beyond one-third the length of the wing; 

 costal cell most fre(|uently open, or the subcostal and costal nervures 

 are couliuent Tribe II — Diai'HIINI 



Tribe I — Spilomicrini, 



The longer submarginal vein, that almost invariably reaches the costa 

 at about half its length, and the closed (rarely open) costal cell can be 

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

 two genera, Aneurhynchus and LahoUps^ that the submarginal vein does 

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

 in a stigma. 



The genera are not numerous and may be synoptically represented 

 as follows : 



TABLE OP GENERA. 



FEMALE.S. 



1. Antenna? 14 jointed ; mesonotuui with 2 furrows Polypeza Forster 



AnteuniB 12-iointed 3 



Antenna? 13-jointed. 



Mesonotum -without furrows (rarely slightly developed posteriorly) 2 



Mesonotuui with 2 distinct furi'ows. 



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



Metathorax not armed at base with a curved si)ino. 

 Basal nervure absent or subobsolete. 



Abdomen rounded or truncate at ti]> ; costal cell open ; stigmal vein often 



with a backward directed branch Hemilkxis Forst. 



Abdomen couically pointed; costal cell closed; stigmal vein simple. 



Pakamesil's Westw. 

 21899— ]S'o. 45—25 



