1864.] 



19 



Q 



above with a black transverse mark, broadest on the 2nd and narrow- 

 est on 5th segment, the black color not reaching the lateral margins ; 

 remaining segments entirely yellowish-rufous; apical segments shining. 

 Length 6A lines ; expanse of wings 10 lines. 



/^(/&.— Virginia (Dr. "Wilson) ; Illinois (Dr. Lewis). 



10. Isch. scitulus, u. sp. 



Blackish : face, orbits, annulus on antennte, scutellum, coxse and trochan- 

 ters, yellowish : spot on pleura, most of metathorax and the abdomen, except 

 base, pale rufous: wings hyaline, iridescent. 



Male. — Head black ; the face, clypeus, orbits, interrupted on each 

 side near the summit, mandibles, except tips, and the palpi, pale yel- 

 lowish ; antenua? almost as long as the body, porrect, black, brown be- 

 neath, the 15th to 21st joints and the basal joint beneath, yellowish. 

 Thorax black, tinged with brown above ; collar above, tegulae, a sutural 

 line before and a short line beneath the fore-wing, a spot beneath the 

 hind-wing, and an oblique line above the anterior coxfe, all yellowish; 

 a transverse rufous mark on each side of the pleura ; scutellum pol- 

 ished, yellowish, as well as a transverse spot behind it ; metathorax 

 finely punctured, profoundly impressed behind, pale rufous, its sides 

 black and bilobed with black in front, on each side behind a small sub- 

 obsolete yellowish spot. Wings hyaline, iridescent, the apical margins 

 faintly tinged with fuliginous; nervures fuscous, pale at base, stigma 

 blackish ; areolet 5-angular. Legs : the four anterior coxae, all the tro- 

 chanters and the four anterior legs in front, yellowish-white; a spot on 

 the four anterior femora behind, the posterior coxaj, their femora ex- 

 cept extreme base, and the apical half of their tibiae, black ; remainder 

 of the legs pale fulvous. x\bdomen elongate, cylindric, slender at base, 

 shining, dull rufous ; basal segment linear, smooth and polished, black, 

 its extreme apex rufous; basal half of the second segment depressed 

 on each side. Length 3 J lines; expanse of wings 6 lines. 

 Hah. — Illinois. Dr. Samuel Lewis. 



11. Isch. iridescens. n. sp. 



Yellow-rufous; antennse black with a broad whitish annulation ; face and 

 tarsi whitish ; apex of abdomen obfuscated : wings beautifully iridescent. 



Male. — Yellowish-rufous, shining ; face, frontal orbits, clypeus, spot 

 on mandibles, space beneath the eyes and the palpi, whitish, the vertex 

 and occiput piceous ; antennae more than half the length of the body. 



