1864.] 187 



on the disk of mesothorax, the tegulse, a sutural line before and a short 

 line beneath the anterior wings, a spot beneath the posterior wings, 

 and the collar above, white ; scutellum flat, whitish, with a short trans- 

 verse whitish line behind it ; metathorax somewhat finely punctured, 

 shining, a rather large whitish spot on each side behind, the elevated 

 lines well defined, the central area small, rotundate or slightly subquad- 

 rate. Wings hyaline, faintly fuliginous at tips ; nervures and stigma 

 black ; areolet 5-angular. Legs black ; the anterior pair, excepting 

 the femora behind, the intermediate pair with the eoxae beneath, the 

 trochanters, the tarsi, and the femora and tibiae exteriorly, white ; the 

 basal half of the posterior tibiae and tarsi at base, also white. Abdo- 

 men elongate, subcylindrical, slender, black, immaculate, minutely 

 punctured, shining ; basal segments slender, subconvex, rather smooth ; 

 basal fovese of the second segment small, not deep ; beneath black. 

 Length 7 lines; expanse of wings 11? lines. 



^a6.— Illinois (Dr. Saml. Lewis) ; Virginia (Dr. T. B. Wilson). 



Same form as Zsr/;.jV'/»»»s, but that species has the antennae shorter 

 and the metathorax immaculate. 



3. Isch. proximus. n. sp. 



Black; antenute with abroad white aiinulus : face, scutellum, two short lines 

 on mesothorax, two spots on metathorax and the anterior legs in part, white ; 

 wings hyaline ; central area of metathorax small, quadrate. 



Male. — Head black ; the face beneath the antennre, broad orbits, 

 clypeus, spot on mandibles, and the palpi, white ; antennae porrect, 

 three-fourths the length of the body, the 17th to 23rd joints, and the 

 basal joint beneath, white. Thorax black, shining, sparsely punctured 

 above, closely beneath ; mesothorax with the dorsal lines well im- 

 pressed ; tegulae, a broad sutural line before and a short one beneath 

 the wings, the collar above and two short lines on the disk of mesotho- 

 rax, white ; scutellum rather flat, smooth and shining, white, as well as 

 a transverse spot behind it ; metathorax confluently punctured, black, 

 with two white spots behind, the elevated lines tolerably well defined, 

 the central area small and subquadrate. Wings hyaline ; nervures and 

 stigma black ; areolet 5-angular. Legs black ; anterior and middle 

 pairs with their coxae beneath, the trochanters, femora, tibiae and tarsi 

 in front, white, tips of tarsi blackish ; posterior pair with their coxae 

 behind and the extreme two-thirds of their tibice, also white. Abdomen 



