1864.] 145 



antenna;, frontal orbits, clypeus, mandibles except base and apex, and 

 the palpi, yellow ; antennae black, more than half the length of the 

 body, porreet, the basal joint beneath yellow. Thorax somewhat shin- 

 ing above, clothed with short fuscous pubescence, an abbreviated im- 

 pressed line on each side of the mesothorax in front; the tegulje, a short 

 line in front and another beneath the wings, yellow; scutellum convex, 

 smooth, yellow, slightly pilose ; metathorax scabrous, the elevated lines 

 well defined, the central area rather large, subquadrate. Wings subhya- 

 line, faintly fuliginous, and with a brassy reflection ; nervures fuscous, 

 stigma fulvous ; areolet 5-angular. Legs yellow, the two anterior pairs of 

 coxae, except a spot beneath, their femora posteriorly and the posterior 

 coxae, femora and tibiae at tip, black. Abdomen long and rather slender, 

 subopaque, densely and finely punctured ; the basal segment biliueated 

 and finely aciculate ; basal foveas of the second segment deep ; on each 

 side of the third segment at base a small obscure testaceous spot ; apical 

 segments smoother; beneath, the second, third and part of the fourth 

 segments are yellowish. Length 8 lines ; expanse of wings 12 lines. 

 Hah. — Pennsylvania. E. T. Cresson. 



18. Ich. tenebrosus, n. sp. 



Black; fiicc aud scutellum yellow: legs fulvous; wings hyaline; central 

 area of metathorax quadrate, elongate. 



Male. — Head black, the face beneath the antennae, frontal orbits, 

 clypeus, mandibles except base and apex, and the palpi, yellow ; an- 

 tenna3 more than half the length of the body, black, the basal joint 

 beneath yellow. Thorax black, shining, closely punctured ; tegular, a 

 short line before and another beneath the wings, yellow ; scutellum 

 rather flat, yellow, smooth and shining; metathorax roughly punctured, 

 opaque black, the elevated lines well defined, the central area longitu- 

 dinally quadrate. Wings hyaline; nervures fuscous, testaceous at base, 

 the stigma fulvous; areolet 5-angular. Legs pale fulvous, the anterior 

 and intermediate coxre black above, yellow beneath, the posterior pair 

 entirely black, as well as the extreme tips of the posterior tibicG ; pos- 

 terior femora of a more deeper fulvous; tips of tarsi blackish. Abdo- 

 men elongate, rather slender, minutely punctured, opaque black, slightly 

 shining towards the apex ; first segment bilineated and finely aciculate ; 

 basal foveiB of the second segment oblique ; on each side of the third 

 segment at base an obscure ferruginous spot ; beneath black, the second 



