298 ENTOMOLOGICAL SOCIETY 



start from each margin behind the base of the stigmal vein, and are 

 obliquely directed toward the basal middle of the wing, but do not quite 

 meet each other ; marginal vein very long, fully as long as the submar- 

 ginal, the stigmal vein small, only about one-third the length of the post- 

 marginal ; hind wings hyaline. Abdomen clavate, broadened behind, 

 scarcely two-thirds the length of the thorax, blue-black, the first or basal 

 segment pale, the venter somewhat greenish, the ovipositor not exserted, 

 only the tip slightly exposed and that is white. 



Described from one 9 specimen reared by Miss Mary E. Murt- 

 feldt, September 21, 1891, from a spider's nest which Dr. Marx 

 identifies as probably belonging to a Drassits sp. 



This belongs to Antigaster Walsh. [C. V. R.] 



22. Holcopelte nitens n. sp. 



Female. Length, 1.6 mm.; expanse, 2.6 mm. ; greatest width of fore- 

 wing, 0.8 mm. Head delicately shagreened, with a smooth spot between 

 ocelli and one just before anterior ocellus; mesonotum also finely sha 

 greened; metanotum with three median longitudinal carinae, the middle 

 one flattened on top and smooth and glistening, and a smooth space lat- 

 erad of each of the outer carinae; abdomen smooth, glistening. Bristles 

 of thorax black; pile of head and abdomen whitish; eyes with close whit 

 ish pile. General color black, shining, with metallic reflections, those of 

 head, mesoscutum, and metanotum greenish, those of scutellum bluish; 

 abdomen glistening but without colored reflections, all coxae metallic, all 

 other sclerites of all legs pale, whitish, almost translucent; antennal 

 scape whitish, concolorous with all femora, tibiae, and tarsi ; rest of an 

 tenna metallic with close whitish pile. 



Male. Length, 1.3 mm. ; expanse, 2.6 mm. ; greatest width of forewing, 

 0.5 mm. Differs from female only in usual sexual differences in this 

 genus, except that the metallic colors are brighter and the dorsal surface 

 of abdomen has bright golden reflections. 



Described from two male and five female specimens reared 

 from egg-bag of Epeira at Washington, D. C., by Nathan Banks. 

 This species is without much doubt hyper-parasitic, primarily 

 infesting some Ichneumonid in the spider cocoon. 



23. Mestocharis wilderi n. sp. 



Female Length, 1.5 mm.; expanse, 2.7 mm.; greatest width of fore- 

 wing, 0.56 mm. Front delicately transversely shagreened; occipital ridge 

 elevated and acute; occiput densely punctulate ; mesoscutum densely and 

 finely punctulate ; mesoscutellum longitudinally shagreened ; metascutum 

 with a small, deep, nearly round, central fovea; median longitudinal 

 carina of metascutellum well marked and dividing just beyond middle of 

 sclerite into two latero-caudally directed arms ; dorsum of petiole markedly 

 punctate; remaining abdominal tergites very faintly granulate. General 



