MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPIDiE. 137 



sciitelluni is frequently skilled; metatliorax sliort, frequoutly a\ ith acute 

 angles t»r spines. Front wings most frequently with submarginal, 

 marginal, post-marginal, and stigmal veins; the post-marginal and mar- 

 ginal veins are rarely absent, except in the tribes Bmni and Teleasini; 

 if absent, in the tribe iScelioni»i, the submarginal vein terminates 

 iu a stigma or knob. Abdomen sessile, or subsessile, inserted above the 

 coxa^, depressed and sharp-edged or strongly carinated along the sides, 

 where the tergites join the urites; in shape it is variable: it may be 

 broadly oval, oblong, ovate, fusiform, or linear, and often greatly elon- 

 gated, composed of several segments; the second and third segments are 

 usually much the largest, but occasionally the segments are nearly of 

 an equal length. Legs moderate, the femora clavate, the tibia} sub- 

 clavate or slender, the tibial spurs usually 1, 1, 1, the middle and poste- 

 rior spurs generally weak or poorly developed; the tarsi long, slender, 

 5 -join ted. 



This group is probably the most extensive one in the whole family 

 and of the greatest economic importance, all the species comprising it 

 being strictly egg parasites, scarcely a single order of insects being free 

 from their attack. 



It may be subdivided into four natural tribes distinguished as fol- 

 lows: 



TABLE OF TRIBES. 



Alxlomen without distinct lateral carirue, most frequently broadly oval, rarely 

 pointed ovate, depressed, tlie second segment always the largest and 

 longest; post-marginal and stigmal veins long; 2 with 11-jointed 

 antenna}, rarely with 12 joints, clavate; ^ antentue 12-jointed. 



Tribe i. — Telenomini. 



Abdom en always with distinct lateral carinre. 



Abdomen broadly oval or long oval, the third segment much the longest ; jjost- 



marginal vein not developed. 



Marginal vein very short, punctiform or thickened, not or scarcely as long as the 



stigmal vein; stigmal vein short, thickened at base and ending iu a 



rounded stigma; $ antennae 7-joi]ited with an unjointed club; 9 



usually apterous; ^ antenna' 12-jointod, filiform-moniliform; lateral 



ocelli usually close to the inner margin of the eye. .Tribe ii. — B.-eini. 



Marginal A'cin very long, 5 or 6 times as long as the exceedingly short stigmal vein ; 



stigmal vein not thickened at base; 9 antenna? 12-jointed, clavate, 



the club 5 or 6 jointed; J antennse 12-joiuted, filiform, the funiclar 



joints long ; lateral ocelli far away from the inner margin of the eye, 



never very close Tribe in. — Teleasini. 



Abdomen sessile, most frecjuently long, fusiform, or linear, extending beyond the 

 tips of the wings when folded, rarely Ijroadly oval, the segments 

 more nearly equal, or the third segment the longest, but rarely much 

 longer than some one of the others ; post-marginal vein present, 

 rarely wanting, if wanting the submarginal vein terminating in a 

 stigma; marginal vein seldom twice as long as the stigmal; the 

 stigmal not esi^ecially short, oblique, rarely entirely absent; 9 

 antennai 12-jointed, clavate; ^ autennte 12-joiuted, usually filiform 

 (in a single case 10-jointed) Tribe iv. — Scelionini. 



