ICHNEUMONID^. ' 307 



I citrifrons. — % . Small, black; face, clypens,spot on mandibles, and the pal- 

 pi, Iciiion-yellow : antennae rather long, filiform, fulvous, darker above; thorax 

 shining black; tegulse, spot before and another beneath, scutelluni and post- 

 scutellum lemon-yellow; raetathorax with sharply defined elevated lines and 

 a large quadrate central area; wings hyaline, iridescent, nervures pale, areolet 

 5-angular; legs, including the coxoe, pale lemon-yellow, the four anterior coxee 

 and trochanters lemon-yellow beneath, apical half of posterior femora and tips 

 of their tibiae black ; tarsi yellowish ; abdomen blackish, the second and third, 

 and base of fourth segments pale ferruginous; first segment bilineate, finely 

 aciculate ; base of second segment deeply im])ressed on each side. Lengths — 

 3i lines. 



JIab. — Connecticut, Pennsylvania. Two '^ specimens. 



I? trogiformis.— This will probably form a new genus. The 9 is uniformly 

 ferruginous, the antennae shorter than in % , and the legs are entirely ferrugi- 

 nous, with the tarsi not yellow as in the 'J, . Eight % , one J , specimens, from 

 New Jersey, Florida and Louisiana. 



I. Lewisii. — This species varies considei-ably. The head, thorax above and 

 abdomen are sometimes ferruginous, with the thorax beneath and incisures be- 

 tween the first, second and third segments of abdomen, black; sometimes the 

 metathorax is black, and the mesothorax and scutellum reddish-brown; the an- 

 tennae are long and slender, tricolored — fulvous, yellow and black; the legs ful- 

 vous, with the coxae black, and the base of the third abdominal segment has a 

 broad black band; one specimen has the body almost entirely blackish, the 

 head, scutellum, apex of second abdominal segment and the apical segments be- 

 ing dull reddish; the wings are always uniformly dark fuscous, and more or 

 less violaceous. I. sandix is probably a variety of this species. 



I. maius. — 9. Head black, narrowed beneath, palpi pale; antennae rather 

 long and slender, brown, with a white annulus about the middle; thorax black, 

 mesothorax and most of prothorax brown-ferruginous, the former shining and 

 depressed; scutellum obscure yellowish; metathora.x shining, rugulose, broad- 

 ly excavated posteriorly, central area quadrate; wings hyaline, faintly yellow- 

 ish, nervures and stigma brown; legs ferruginous; coxae, base of trochanters, 

 middle femora behind, most of posterior femora, and tips of their tibiae, black; 

 abdomen broad, ovate, depressed, shining, rufo-ferruginous; petiole of first seg- 

 ment slender, flat, polished, black; two apical segments above with a yellow 

 central spot; beneath yellowish. Length 5 lines. 



Hah. — Massachusetts, (Mr. F. Stratton, May 17.) One 9specimen. 



I. fuscifrons. — This species varies by having the anterior orbits more or less 

 yellow, sometimes almost white; sometimes there is a yellow suturalline before 

 the wings; the legs are sometimes ferruginous, with the coxae spotted with yel- 

 low; the abdomen is also sometimes ferruginous, with an obscure yellowish 

 spot on each side of second segment at tip. Three 9 specimens from Illinois. 



I. disparilis. — 9- Ferruginous, tinged with dusky; upper anterior and a spot 

 on the posterior orbits, yellow; antennae stout, blackish-brown, with a yellow- 

 ish annulus about the middle, between the middle and apex the joints are di- 

 lated and flattened beneath ; incisures of the thorax and the region on each side 

 of scutellum blackish; tegulre, short line before and another beneath, scutellum 

 and post-scutellum yellow; metathorax shining, confluently punctured, exca- 

 vated behind, the lateral angles prominent, the elevated lines well defined, and 

 the central area smooth, subconical, emarginate behind; wings hyaline, ner- 



