194 [June 



black, the 10th to 15th joints whitish, the basal joint beneath pale 

 fulvous. Thorax polished, the tegulae whitish, the suture just beneath 

 the wings and pleura beneath immediately behind the fore legs, black- 

 ish ; scutellum slightly convex, dull rufous as well as a spot behind it, 

 the space on each side blackish ; metathorax minutely punctured, shin- 

 ing, yellowish-rufous, the elevated lines tolerably well defined, the cen- 

 tral area small, rather elongate. Wings hyaline, beautifully iridescent, 

 nervures and stigma pale fuscous, the former pale at base ; areolet 

 5-angular. Legs yellowish-rufous, the four anterior coxae and all the 

 tarsi, whitish ; extreme tips of the tarsi blackish. Abdomen slender 

 at base, polished, yellowish-rufous, the three apical segments brownish. 

 Length 3 lines ; expanse of wings 5 lines. 

 Hub. — Delaware. Dr. Thos. B. Wilson. 



12. Isch. albitarsis, n. sp. 



Very slender, black : most of the face, scutellum and tarsi, whitish ; abdo- 

 men rufous : wings hyaline. 



Male. — Very slender, black, shining ; face : the inner orbits, broad 

 beneath the antennfe, a bilobed spot just beneath the antennae, most of 

 the clypeus, a spot on each mandible, and the palpi, whitish ; antennae 

 slender, about as long as the body, black, the basal joint beneath with 

 a white spot. Thorax finely punctured ; the tegulae, a sutural line be- 

 fore and a short line beneath the fore-wing, the collar above and a spot 

 on each side of the pleura just above the anterior coxa, whitish; scu- 

 tellum slightly convex, polished, black, with a rather large whitish spot, 

 and a short transverse whitish line behind it ; metathorax black, finely 

 and densely punctured, truncate behind, the elevated lines not well 

 defined, the central area rather large, subquadrate, obsoletely defined. 

 Wings hyaline, faintly tinged with fuliginous, slightly iridescent; ner- 

 vures fuscous, pale at base, stigma black ; areolet 5-angular or subtri- 

 angular. Legs black, the four anterior coxae and trochanters beneath, 

 their femora, tibiae and tarsi before and the posterior tarsi, except base 

 and extreme apex, whitish. Abdomen elongate, slender, cylindric, 

 polished, rufous, the apex slightly blackish ; basal segment linear, with 

 a slight tubercle on each side behind the middle. Length 4-2-5 lines ; 

 expanse of wings G — 7 lines. 



Hub. — Illinois. Dr. Samuel Lewis. 



