MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID^E. 209 



The parasitism of many of the genera is known, all being parasites 

 in the eggs of various insects, but principally iu those belonging to the 

 Orthoptera and Hemiptera. Baryconus and Cacus attack the eggs of 

 the White Tree-crickets, Oecanfhus niveus, etc.; MacroleJela, those of 

 OrchcUmum; Scelio, various Locusts or Grasshoppers, Dissostcira, 

 Caloptemis and Acridium; while Hadronotus, a genus easily mistaken 

 for Telenomns, is parasitic on different Heteroptera-Hemiptera, belong- 

 ing to the families Coreid;e, Pyrrhocoridre and Eeduviid.T. 



It is believed the genera can be readily separated by the aid of the 

 following table: 



TABLE OF GENERA. 



FEMALES. 



Postmargiual vein wanting or never greatly developed, always shorter than the 

 stignial vein, the submargiual vein often never reaching the costa 



and terminating in a large stigma, the abdomen long, fnsiform 4 



Postmarginal vein always greatly lengthened, the suhmarginal never terminat- 

 ing in a stigma. 



Basal vein wanting 3 



Basal vein present. 



First abdominal segment without a horn at base 2 



First abd(»minal segment with a horn at base. 

 Marginal vein short; abdomen long, pointed, fusiform, the first segment 

 narrow, petioliform, the second and third segments nearly equal. 



Caloteleia Westw. 

 Marginal vein long; abdomen long, linear or subfusiforni, the first segment 



quadrate or subqnadrate Baryconus Forst. 



2. Abdomen long, pointed fusiform or linear, segments 2, 3, and '1 nearly equal. 

 Mesonotum with 2 furrows. 

 Metascutellum without a spine. 

 Metauotum with no inclosed s])ace at base. 



Marginal vein about twice the length of the stigmal. 



Mandibles 3-dentate Macroteleia Westw. 



Mandibles 2-dentate Calliscelio, gen. nov. 



Marginal vein very short. 

 Metanotum with a large, semicircular inclosed space at ba.se. 



Marginal vein punctiform Chromoteleia, gen. nov. 



Abdomen oblong-oval or fusiform, but not especially lengthened. 

 Metascutellum spined. 

 Mesonotum with 2 furrows. 

 Mandibles 2-dentate; abdominal segments 1 and 2 equal in length, the 3d 



longer Opisthacantha, gen. nov. 



Mesonotum without furrows. 

 Mandibles 2-dentate; abdominal segments 1 and 2 equal in length, the 



3d longer (Opisthacantha). 



Mandibles 3-dcntate; segments 2 and 3 equal in length, the 1st shorter. 



Lapitha, gen. nov. 

 Metascutellum not spined, simple. 

 Marginal vein short, or not more than half the length of the stigmal, most 

 frequently punctiform. 

 Mesonotum without furrows. 



Head quadrate, mandibles 3-dentate Cactjs Riley. 



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