182 E. T. CRESSON. 



Microdns nigriceps, n. sp. 



■f 'J,. — Pale sanguineous ; head, antennse, spot behind postscutellum, pleura, 



beneath, four anterior coxse, all the trochanters, tips of four anterior tibiae, 

 posterior pair except middle, and all the tarsi, black; anterior margin of 

 clypeus and tips of mandibles reddish; mesothorax trilobate; metathorax 

 coarsely rugose; wings dark fuscous, a large irregular hyaline spot beneath 

 stigma, continued beneath areolet, which is minute, triangular and petiolated ; 

 abdomen polished, first segment with a prominent lateral tubercle near base, 

 second segment with two deep basal fovese. Length .30 inch. 

 One specimen. (Coll. G. W. Belfrage.) 



1 JVIierodns verticalis, n. sp. 



■ 9. — Yellow-ferruginous, shining, head small, triangular; a large spot on 



vertex covering ocelli and continued on occiput, a spot beneath base of each 

 antenna, apex of clypeus, most of mandibles and a spot on each side above 

 base of same, black; antennae as long as body, slender, entirely black; meso- 

 thorax strongly trilobed; metathorax rounded, rugose; wings dark fuscous, 

 with an irregular hyaline streak beneath stigma, areolet minute, petiolated; 

 tips of posterior tibise and four posterior tarsi fuscous; abdomen as in nigriceps ; 

 ovipositor as long as abdomen. Length .35 inch. 



One specimen. (Coll. Gr. W. Belfrage.) This may be the $ of 

 nigriceps. 



^ microdiis pygmseus, n. sp. 



(p. — Small, black, shining; head, mesothorax, pleura and apex of abdo- 

 men polished; metathorax with two approximate discal carinse; wings hya- 

 line, faintly dusky, nervures and stigma fuscous, areolet minute, petiolated; 

 legs honey-yellow, coxse, posterior trochanters, tips of their tibise and all the 

 tarsi blackish; posterior tibife pale, with a dusky spot before base; abdomen 

 with two basal segments subopaque, densely and minutely sculptured, base of 

 second segment with two deep fovese and a central transverse, rather deeply 

 impressed, subarcuate line; ovipositor longer than abdomen. Length .15 inch. 



-^ . — More shining than 9 : legs paler, all the coxae, trochanters and base of 

 femora black; abdomed entirely polished. 



Two specimens. (Belfrage.) 



Iscliius Iseviventris, n. sp. 



1 'J, . — Slender, black, shining; head subrotund ; mandibles and palpi brown ; 



antennse nearly as long as body; wings hyaline, costal nerve black, nervures 

 and stigma pale; legs pale honey-yellow, coxse and most of trochanters black ; 

 base of anterior femora, tips of posterior pair, tips of their tibise and all the 

 larsi dusky; abdomen piceous-black, polished ; venter pale. Length .15 inch. 

 One specimen. (Belfrage.) A specimen from Dacota has the ab- 

 domen, except first segment, pale brown. 



J Agatliii^ exoratus, n. sp. 



'^.—Yollovv-ferrugmous, smooth, shining; head more or less varied with 

 black; mandibles, palpi, antennse entirely, collar above, tegulse, scutellar re- 

 gion, postscutellum, metathorax except lateral spot, pleura beneath, four an- 

 terior coxse, all the trochanters, extreme tips of posterior femora, and their 



