1864.] 295 



are fuscous above with a broad yellowish annulus, the basal half of the 

 scutellum is black, and the postscutelluin, metathorax aud abdomen 

 are immaculate, the latter very slender. Length 6 lines. 

 Hah. — Rocky Mountains, Colorado Territory. ♦ 



8. Cryptus junceus, n. sp. 



Black ; spots on the face, most of antennse, scutellum, iiosterior face of meta- 

 thorax and tlie legs, excejit coxse and posterior femora, yellow : abdomen very 

 slender, basal segment long and linear. 



FcmdJc. — Black, shining; frontal orbits, a line on the orbits behind, 

 two spots just beneath the antennae, most of the clypeiis and labrum, 

 and the palpi, yellow; antennae porrect, nearly as long as the body, 

 yellowish, blackish at base and apex especially above, basal joint black, 

 yellow beneath, the 3rd joint about two-thirds the length of the 4th and 

 5th together, the incisures indistinct. Thorax densely and finely punc- 

 tured, the dorsal lines well impressed ; collar above, two spots in front 

 of mesothorax, and tegulae, yellow; scutellum convex, polished, yellow, 

 as well as a narrow line on each side extending to the base of the pos- 

 terior wings and a spot on the postscutellum ; metathorax as in the 

 preceding species, except that the large yellow mark on its posterior 

 fiice is subtriangular. Wings hyaline, slightly iridescent, the apical 

 margins slightly fuliginous ; nervures fuscous, pale at base, stigma 

 brown ; areolet large, subquadrate, its lower nervtire angular. Legs 

 long and slender, especially the posterior pair, polished, yellow ; the 

 coxae, except a spot at the base of the posterior pair behind, the poste- 

 rior trochanters and their femora, black. Abdomen elongate, very slen- 

 der, slightly fusiform ; basal segment polished, half again as long as 

 the second segment, cylindric, slightly arcuated, not at all dilated at 

 tip, the lateral tubercles not visible ; ovipositor about half the length 

 of the abdomen, rufo-piceous, valves black. Length 6 lines ; expanse 

 of wings 9 2 lines. 



Hab. — Illinois. Dr. Samuel Lewis. 



Closely allied to C. excelsus, but is much more slender, the basal seg- 

 ment of the abdomen longer, more cylindric, not depressed above and 

 without lateral tubercles, the legs and antennae are diflPerently colored 

 and the wings clearer. 



