MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 263 



stemiiiiui, but it is believed the table below will be found all That is 

 necessary to distiuguish them. If, however, the student should be at 

 fault the full generic description may be consulted. 



TABLE OF GENERA. 



FEMALES. 



Scutellnm not lengthened, seraicircnlar, either flat or convex and unarmed.. .. 5 

 Scntelhim lengthened, never semicircular, or when shortened it is compressed 



at sides and furnished with an awl-shaped thorn or tubercle at tip. 2 



2. Scutellnm with a strong awl-shaped thorn at tip 3 



Scutellnm with a short thorn or tubercle at tip 4 



Scutellnm lengthened, triangular, often produced into a long, acute spine. 



Thorax strongly compressed from the sides. 



Head large, rounded, or quadrate Piestopleuka Fiirst. 



Thorax not strongly compressed from the sides. 



Mesonotal furrows deep, parallel posteriorly. Xestonotus Forst. 



Mesonotal furrows feebly impressed or wanting Amblyaspis Forst. 



3. Lateral ocelli nearer the margin of eye than to the apical ocellus; antennal clnb 



4-jointed Leptacis Forst. 



Lateral ocelli not nearer the margin of eye than to the apical ocellus; antennal 

 club 3-jointed Isorhombus Forst. 



4. Abdomen very much lengthened; antennal club 5-jointed. Lateral ocelli as near 



to the front ocellus as to the margin of the eye ..Polymkcus Forst. 

 Abdomen not especially lengthened; antennal club 4-joiuted. 



Second ventral segment strongly compressed, sack-like; lateral ocelli their 



width from the eye margin Sactogaster Forst. 



Second ventral segment normal ; lateral ocelli close to the eye margin. 



Synopeas Forst. 



5. Scutellnm convex 6 



Scutellum cnpuliform as in the Cynipid genus Eucoila. 



CcF.T.OPEi.TA Ashra., gen. nov. 

 Scutellum not cnpuliform, flattened. 

 Mesonotal furrows wanting; antennne 10-jointed, the club 4-jointed. 



Anopedias Forst. 

 Mesonotal furrows usually distinct; autennaj 8-jointed, club not jointed. 



Amitus Hald. 



6. Scutellum with a tuft of hair at tip Trichacis Forst. 



Scutellum without a tuft of hair at tip. 



Abdomen very much lengthened. (Polymecus.) 

 Abdomen not much lengthened. 



Margin of abdomen very broadly deflexed Hvpocampsis Ftirst. 



Margin of abdomen normal. 



Thorax short; the scutellum pillow-shaiied, separated from the mesonotum 

 by a deep furrow; mesonotal furrows rarely distinct or complete. 



No keel between the antenme Polygnoti?s Fiirst. 



A sharp distinct keel between the antennre. 



Eritrissomerus Ashm., gen. nov. 

 Thorax more elongate; scutellum not separated from the mescmotum by a 

 deep furrow. Mesonotal furrows distinct, complete. 

 Lateral ocelli nearer the margin of the eye than to the apical ocellus; 



head transverse Platygaster Latreille 



Lateral ocelli nearer to the apical ocellus than to the margin of the eye; 



head cubital IsocYBUS Forst. 



