MONOORAPn OF THE NORTH AMKRK'AN PROCTOTRYPID.E. 209 



The i)iira.siti.sm of many of the genera, is known, all being iJaraaites 

 in the eggs of various insects, but princip;illy in those belonging to the 

 On hoptera and Ilemiptera. linrvcotmH nud Cacun attack the eggs of 

 the White Tree-crickets, Occanthns nireioi, etc.; Macroteleia, those of 

 Orchi'Umum; Scelio, various Locusta or Grasshoi)pers, DisnoHtdra, 

 Caloptenus and Avridium; while Hadronotux, a genus easily mistaken 

 for I'elenomus, is parasitic on ditterent Heteroptera-Hemiptera, belong- 

 ing to the families Coreidse, i'yrrhocoridne and Reduviidie. 



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

 following table: 



TABLE OF GENERA. 

 FEMALES. 



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

 stignial vein, tin; siibniargiunl vein oft<ii nt^vcr reaching the costa 



and terminating in a large stigma, the abdomen long, fn«iform 4 



Postmarginal vein always greatly lengthened, the aubmargiual never terminat- 

 ing in a stigma. 



Basal vein wanting 3 



Basal vein present. 



First abdominal segment without a horn at base 2 



First abdominal 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 subfnsiform, the first segment 



quadrate or subquadrate Baryconvs Forst. 



2. Abdomen long, pointed fusiform or linear, segments 2, 3, and 4 nearly equal. 

 Mesouotum with 2 furrows. 

 Metascutellnm without a spine. 

 Metanotum with no inclosed space at base. 

 Marginal vein about twice the length of the stigmal. 



Mandibles 3-d<'ntate Macroteleia Westw. 



Mandibles 2-dentate Calliscelio, gen. nov. 



Marginal vein very short. 

 Metanotum with a large, semicircular inclosed space at base. 



Marginal vein punctiform Chromoteleia, gen. nov. 



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

 Metascutellnm spined. 

 Mesonotum with 2 furrows. 

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



longer Opisthacantua, 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 Ist shorter. 



Lapitiia, gen. nov. 

 Metast'utcllum not spined, simple. 

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

 frcrjuently punctiform. 

 Mesonotum without furrows. 

 Head quadrate, mandibles 3-dentate Cacus Riley. 



21899— No. 45 14 



