290 [September 



rather truncate behind, the lateral tubercles acute, from each of these 

 tubercles a carina proceeds forward and forms a well-defined, transverse, 

 semicircular central area on the disk. Wings ample, fuliginous, with a 

 bluish gloss, the posterior pair clearer; nervures and stigma black; 

 areolet rather large, subquadrate or 5-angular, the lower nervure broadly 

 ano-ular, the cubital nervure with a rudimental nerve within the first 

 submarginal cell. Legs rufous, polished, the coxae and trochanters 

 black, the posterior tibiae and tarsi reddish-brown ; femora rather ro- 

 bust, the two posterior pair undulate beneath and somewhat suddenly 

 constricted at tip. Abdomen very robust, ovate, shining black, fiiintly 

 tinged with blue ; basal segment much arcuated, short, polished, flat- 

 tened above, and broad at tip, which is sulcate on the middle and on 

 each side ; venter polished ; ovipositor two-thirds as long as the abdo- 

 men, black. Length G — 7 lines ; expanse of wings 11 2 — 12 lines. 

 Hah. — Rocky Mount;^ans, Colorado Territory. 



2. Cryptus proximus, n. sp. 



Black; wings fuliginous, with a bluish gloss; legs rufous, femora simple: 

 metathorax with a large, triangular central area. 



Female. — Differs from C. rohustus, to which it is closely allied, as 

 follows : — More elongate and much less robust ; the 3rd joint of the 

 antennae not as long as the 4th and 5th together, the two latter being 

 each two-thirds the length of the 3rd joint; the mesothorax more opa(|ue 

 and densely punctured ; the central area of the metathorax is large and 

 triangular ; the legs rather longer, the femora slender, simple, not at 

 all undulate beneath or constricted at tips, the 4th, 5th and 6th joints 

 of the posterior tarsi are yellowish ; the abdomen more elongate, much 

 less robust, and the ovipositor as long as the body, rufo-piceous, with 

 the valves black. Length 7 lines; expanse of wings 11 lines. 



Hah. — Rocky Mountains, Colorado Territory. 



3. Cryptus luctuosus. n. sp. 



Black; frontal orbits whitish; femora rufous; wings smoky, hyaline with a 

 bluish gloss ; metathorax without a central area ; ovipositor short. 



Female. — Black, shining; frontal orbits beneath the antennae whit- 

 ish ; clypeus polished, a slight prominence between it and the base of 

 the antennae, behind the latter the front is rather deeply excavated and 

 aciculate ; antennse more than half the length of the body, rather slen- 

 der, somewhat involute, black, brownish-sericeous towards the tip, basal 



