No. 2326. THREE TRIBES OF ICHNEUMONINAE—CUSHMAN. 19 



No specimen of the genotype has been available for study, but the 

 two species discussed below, judging from previous characterizations 

 of the genus, seem to belong here. 



Colpomeria is very closely allied to Polyspliincta and Acrodactyla, 

 standing in general form and structm-e between those two genera. 

 From both it differs in the incrassate femora in the female and in the 

 possession of the prescutal cristulae. The following additional char- 

 acters possibly of some generic value are common to all specimens at 

 hand: head from above transversely oval; malar space subequal to 

 basal width of mandible ; propodeum longer than high, straight above 

 with petiolar region declivous, median and apical carinae rather 

 strong; abdomen narrowly sessile, subclavate, broadest at about 

 apical third, firet tergite nearly twice as long as wide at apex, its sides 

 nearly straight and but slightly divergent, other tergites with the 

 usual elevations and impressions rather weak; ovipositor gently up- 

 curved and much shorter than first tergite ; mediella strongly curved 

 before the nervellus, which is strongly inclivous. 



Only two species of this genus are at hand; these are separable on 

 structural and color characters, which, in the small number of speci- 

 mens available for study, seem to be constant. 



KEY TO NORTH AMERICAN SPECIES. 



Protliorax and mesothorax entirely bright testaceous; tergites laterally pmonth. 



mellithorax Cushman. 



Prothorax and mesothorax black or piceous at least dorsally; posterior tergites laterally 



with large suberased punctures hincaidii (Ashmead). 



COLPOMERU MELLITHORAX. new species. 



Closely allied to Icincaidii, but distinguishable from that species by 

 the characters employed in the key. 



Female. — Length 4.5 mm., ovipositor 0.3 mm., antennae (broken). 

 Head polished, impunctate; eyes weakly divergent and not at all 

 emarginate; ocell-ocular and postocellar lines about equal to each 

 other and to diameter of lateral ocellus ; malar space slightly longer 

 than basal width of mandible; prothorax and mesothorax polished, 

 the latter obscurely punctate below; metapleura and pleural areas 

 polished, more or less rugosely roughened near the carinae; first ter- 

 gite about three-fifths as wide at apex as long, carinae nearly reaching 

 apex, polished between the carinae, dorsal surface outside the carinae 

 somewhat longitudinally rugosely roughened and with a small low 

 elevation beyond the middle; second tergite rugosely roughened 

 laterally; abdomen otherwise polished and unsculptured. 



Piceous black with prothroax and mesothorax entirely testaceous; 

 legs yellowish white with coxae paler, hind tibia with distinct piceous 

 apical annulus and a weaker one at about the basal third, this pattern 

 obscurely repeated on middle tibia but with the dark color replaced 

 by stramineous, middle tarsi with entire last joint and apices of all 



