18G4.] 307 



and sometimes tinged with rufous, lateral tubercles scarcely visible. 

 Wings ample, hyaline, iridescent; nervures and stigma black; areolet 

 moderate, 5-angular. Legs, with their coxjb, entirely rufous, moderate. 

 Abdomen oblong-ovate, slender at base, rather broad and sometimes 

 slightly compressed at tip, shining, the three basal segments rufous, 

 the remainder black, with a white spot at tip above; basal segment gra- 

 dually dilated towards the tip, without lateral tubercles ; ovipositor as 

 long as the abdomen, rufo-piceous. Length 2|- lines, expanse of wings 

 4 2 lines. 



Hdh. — Delaware (Dr. Wilson) ; Illinois (Dr. Lewis). 



Resembles C. incertus^ but is much smaller, the antennas shorter and 

 stouter, the wings clear, ovipositor longer, and the color somewhat dif- 

 ferent. 



Section 5. 



25. Cryptus pallidus, n. sp. 



Pale honey-yellow ; head black, face rufous : antennse black with a white 

 annulus; collar, tegulfe and spot on tip of abdomen, white: wings hyaline. 



Female. — Pale honey-yellow; head black, most of face, clypeus, and 

 mandibles, rufous ; palpi pale ; antenna? more than half the length of 

 the abdomen, rather slender, black, with a broad white annulus about 

 the middle, the three or four basal joints, especially beneath, pale rufous. 

 Thorax shining; mesothorax polished; the dorsal lines tolerably well 

 impressed ; scutellum slightly convex, polished ; metathorax minutely 

 rugose, subopaque, the elevated lines not well defined, longitudinal, the 

 central area very elongate, broad behind and narrowed in front, the 

 posterior declivity abrupt, the carina bounding it above sharply defined, 

 and ending on each side in a short subacute tubercle. Wings hyaline, 

 faintly tinged with yellowish, iridescent; nervures and stigma pale tes- 

 taceous ; areolet 5-angular, moderate. Legs rather slender, color of 

 the body ; the coxae tinged with yellowish. Abdomen about as long- 

 as the head and thorax, oblong-ovate, slender at base, faintly compressed 

 at tip ; three basal segments opaque, apical segments polished, with an 

 obscure whitish spot at extreme tip above ; basal segments gradually 

 dilated towards the tip, without lateral tubercles; ovipositor two-thirds 

 the length of the abdomen, piceous. Length 3| lines; expanse of 

 wings ;")•] lines. 



ILih. — Delaware. Dr. Thomas B. Wilson. 



