390 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



8. Hypogidium very large, voraeriform, acute at apex, very heavily cliitinized; 

 clypeus broadly truncate at apex, frequently eharply inflexed and with a more 

 or less distinct median tooth; labrum exserted, (parasites on wood-boring 

 larvae), fig. 9 Acoenitini. 



10 



FIG.39.— APEXJOF ABDOMEN OF FEMALE OF COLEOCENTRUS OCCIDENTALIS CrESSON. 



Hypopygidium not as above, usually retracted far from apex of abdomen, very 

 rarely (CHstopyga) reaching apex 9. 



Occipital carina obsolete or interrupted dorsally; mesoscutum and scutellum 

 transversely rugose throughout; apical tergite greatly lengthened; (external 

 parasites on wood-boring larvae) Bhyssini. 



Occipital carina complete; mesoscutum and scutellum not transversely rugose, at 

 most the scutum is rugulose; apical tergite only rarely greatly lengthened. 10. 



, Abdomen inserted above, frequently far above, the hind coxae; first tergite 

 narrow throughout; head transverse; occiput narrow, barely concave; temples 

 short and strongly convexly sloping; eyes emarginate within; propodeum 

 nearly straight and horizontal from base to insertion of abdomen; hind coxae, 

 long, slender and nearly uniform in diameter, fig. 10 Labenini. 



Fig. 10.— Areolet 

 OF Labena obal- 

 LATOR (Say). 



Fig. 11.— Areolets: a, Tromatobia rufovariata 

 (Cresson); 6, Itoplectis coNQxnsrroB (Say); 

 c. Epiubus albokicta (Cresson). 



11. 



Not agreeing entii'ely with above, fig. 11 11 



Abdomen sessile (not distinctly tapering from spiracles to base and with promi- 

 nent anterior lateral angles), very rarely {Perithous) clavate and slightly com- 

 pressed at apex; areolet usually defined; claws rarely without basal tooth; (ex- 

 ternal parasites on lepidopterous, coleopterous, and hymenopteroua larvae and 

 pupae, or in spider egg-sacs), fig. 12 Ichmeumonini. 



Fig. 12.— Sessile hrst tergite of 

 Perithous pleubalis Ckesson. 



Fig. 13.— Petioatel first tergite of Xor- 



IDES YUK0NENSI3 (ROHWER). 



Abdomen petiolate (tapering from spiracles to base, and without prominent anterior 

 lateral angles), clavate to subcylindrical and more or less compressed apically; 

 areolet usually wanting; claws without basal tooth; temples broad; (external 

 parasites on wood-boring larvae), fig. 13 12. 



