ICIINEUMONID.E. • 297 



ginate behind: wings hyaline; antoridr legs ]ialish in front: hasal segment i)f 

 abdomen jiolished, with a few large scattered punctures; a]iieal segment po- 

 lished, the two last each with a central white spot. Length 6 lines. 

 J/(xi.— Illinois, (Dr. Lewis). One 9 s])ecimen. 



I. helvipes. — 9- Small, robust, polished; narrow frontal orbits, interrupted 

 on each side of antenn?e, white: mutitii testaceous; i^alpipale; antennae short, 

 subserrate, brown-black above, dull testaceous beneath, brown-black at base ; 

 a line on the collar, sutural line on each side of thorax before the wing, spot on. 

 the tegulfe anteriorly, a short line beneath each anterior wing and the lateral 

 margins of the scutellum confluent at tip, all whitish ; the elevated lines of the 

 nietathorax sharply defined, with the central area moderate and transversely 

 subquadrate : wings hyaline; legs short, robust, especially the posterior femora, 

 rufous, coxse black, tips of joosterior tibife and their tarsi blackish; abdomen 

 robust, posterior margin of the fifth segment, and the two following segments 

 entirely, yellowish-white. Length 4 lines. 



%. More slender than the J, which it otherwise closely resembles; in one 

 specimen the areolet of the anterior wing is triangular, with an additional, ru- 

 dimental nervure at tijj. Length 4 lines. 



^a6.— Mass., Conn., (Coll. Mr. E. Norton); Ills., (Dr. Lewis). One 9 , three 

 % specimens. Easily recognized by the small size and short, thick red legs. 



I. clarus. — 9- Entirely bright Itlue, shining: narrow anterior orbits, and a 

 line on the posterior orbits, white: head much narrowed beneath: antenna) 

 long, slightly thickened near the tips, with a broad white annulus a little be- 

 yond the middle ; a short line before and another beneath the tegulse, white; 

 scutellum with a white spot at tip ; metathorax with a short spine on each side 

 behind, the central area large, quadrate; wings hyaline, slightly yellowish, 

 areolet triangular; legs blue, the anterior pair whitish in front; abdomen 

 rather short, slightly dilated beyond the first segment, which is slender at base 

 and suddenly dilated at tip, the upper surface of which is jxdished, but rather 

 uneven; tip of abdomen polished. Length 6 lines. 



Hab. — Massachusetts, (Eidings). One 9 specimen. A very pretty species, 

 with the blue color quite bright. 



I. albomarginatus. — % . Black; face, orbits, broad on the lower posterior half, 

 clypeus, mandibles and palpi pale yellow; antennae black, basal joint beneath 

 yellow; tegulse, sutural line before and short line beneath each anterior wing, 

 square spot on disk of mesothorax, scutellum, post-scutellum, two square marks 

 on metathorax behind, anterior margin of prothorax, and an irregular mark on 

 each side of [)leura, just behind anterior coxae, dull yellowish; wings hyaline, 

 ver3' faintly tinged with dusky, nervures and stigma brown, areolet triangular ; 

 legs black, four anterior coxas, trochanters and femora white beneath, their ti- 

 biae, tarsi, apical half of posterior trochanters and their tibiae at base, also white ; 

 abdomen elongate, narrow, tip of first segment, and narrow posterior margins 

 of remaining segments, white; on the third and following segments the fasciae 

 do not extend entirely to the sides, but become gradually shorter, so that the 

 two apical segments have only a white central spot instead of a fascia. Length 

 6 lines. 



Hub. — Mississippi, (Coll. Mr. E. Xor(on), One % specimen. 



TRANS. AMER. E\T. SOC. (38) OCTOBIOR, 18ti7. 



