1864.] 159 



ceous at base, stigma pale fulvous ; areolet 5-angular. Legs yellow ; 

 the posterior coxre, their femora except extreme base, and the apex of 

 their tibia), black ; tips of the tarsi brown, the four anterior femora 

 stained with blackish behind. Abdomen elongate, rather stout, black ; 

 the 2nd, except a transverse irregular blackish mark at tip, and the 

 whole of the 3rd segment, yellow ; basal segment bilineated, finely 

 aciculate ; basal fovese of the 2nd segment deep ; apical segments 

 smoother than the basal ones; beneath colored same as above, except 

 that the 4th segment is stained with yellowish. Length 7 — 8^ lines; 

 expanse of wings 12 — 13 2 lines. 



Hah. — Illinois (Dr. Saml. Lewis) ; Delaware (Dr. T. B. Wilson). 



The lines on the disk of the mesothorax, and the irregular mark on 

 the pleura are sometimes wanting; the foveas of the 2nd abdominal 

 segment are sometimes black, and the irregular black mark on the 

 apical half of this segment sometimes forms a regular band. 



This species is closely allied to Mi. leetus Brulle, and may possibly 

 *prove to be a variety of it. The wings are, however, longer, the an- 

 teunsB are entirely black, except the basal joint beneath, and the basal 

 segment of the abdomen is always black; only two segments are yel- 

 low, while Isehis has four. 



3(5. Ich. parvuS; n. sp. 



Black: face, scutellum; legs in part, and the apical half of the three first 

 abdominal segments, yellow : wings subhyaline ; central area of the metatho- 

 rax moderate, subquadrate. 



Male. — Black, finely punctured, shining; the face, clypeus, spot on 

 mandibles and the palpi, yellow ; antennas about half the length of the 

 body, porrect, black, the basal joint beneath yellow. Thorax entirely 

 black; scutellum slightly convex, polished, entirely yellow; metathorax 

 finely punctured, the elevated lines well defined, the central area mode- 

 rate, subquadrate, somewhat elongate, rounded in front and indented 

 behind. Wings subhyaline, slightly iridescent ; nervures fuscous, paler 

 at base, stigma brown or fulvous ; areolet 5-angular. Legs yellow ; the 

 coxa), the four anterior femora behind, the posterior femora entirely 

 and their tibiae at tips black ; tips of the tarsi blackish, and sometimes 

 the posterior tarsi are almost entirely blackish. x\bomen elongate, 

 rather slender, apical segments smooth and shining, the basal ones 

 finely punctured; basal segment bilineated, finely aciculate; basal foveae 



