18G4.] 293 



prominent ; the remaining segments sometimes faintly tinged with deep 

 blue, and polished towards the apex. Length 62 — 7i lines; expanse 

 of wings 10 — 11 2 lines. 



Hah. — Rocky Mountains, Colorado Territory. 



Readily distinguished by the incrassate antennae. 



6. Cryptus velox, n. sp. 



Black; antennae with a narrow white annulus; legs rufous; wings hyaline, 

 iridescent: ovipositor as long as the abdomen. 



Female. — Black; face short and broad ; clypeus slightly prominent, 

 polished, with a slight puncture on its disk ; mandibles piceous ; front 

 behind the antennae slightly excavated ; antennae nearly as long as the 

 body, slightly involute at tip, black, the 9th to 11th joints white, basal 

 joint robust, piceous beneath, the 3rd, 4th and 5th joints long, sub- 

 equal, the 6th shorter, about as long as the 7th joint. Thorax polished, 

 finely punctured, the dorsal lines well impressed ; scutellum slightly 

 convex, smooth and polished, deeply impressed in front ; metathorax 

 shining, finely punctured, the elevated lines not distinct, but forming a 

 small, subobsolete, triangular central area. Wings ample, hyaline, 

 somewhat iridescent ; nervures and stigma black, the latter with a pale 

 spot at base ; areolet 5-angular or somewhat 4-angular, the lower ner- 

 vure angular. Legs rather slender, pale rufous, the four anterior tarsi 

 at tips, the apex of the posterior femora, their tibia3 and tarsi, blackish. 

 Abdomen elongate, subovate ; basal segment not longer than the second, 

 broad, almost subsessile, flattened above ; apical segments polished ; 

 ovipositor as long as the abdomen, rufous, valves black. Length 4 

 lines; expanse of wings 7 2 lines. 



Hah. — New York. Mr. James Angus. 



Section 2. 



7. Cryptus excelsus, n. sp. 



Black ; antennae tricolored — fulvous, yellow and black ; face, tegulse, scutel- 

 lum, posterior face of metathorax, and most of the legs, yellow ; basal half of 

 posterior femora, fulvous ; wings subhyaline ; basal segment of abdomen long 

 and linear. 



Female. — Black, shining, slightly pubescent; face, except on each 

 side of the clypeus, frontal orbits not reaching the summit, a short line 

 behind the eyes, the clypeus except its extreme apical margin, the 

 labrum and the palpi, yellow; mandibles projecting, narrow, acute, 



