1864.] 308 



rather large ; areolet small, 5-anirular. Legs, with their coxte, entirely 

 pale rufous. Abdomen ovate, flattened, polished, black, the 2nd seg- 

 ment entirely and the anterior margin of the 3rd obscurely, rufous, as 

 well as the lateral margins of the 1st segment, this segment is dilated 

 towards the tip and covered above with fine longitudinal strite, the 

 lateral tubercles are subobsolete ; apical segment slightly tinged with 

 yellowish; ovipositor nearly as long as the abdomen, piceous. Length 

 24liQes; expanse of wings 4 lines. 



Hah. — Illinois. Dr. Samuel Lewis. 



Allied to C. pumilus, but only the middle of the abdomen is rufous. 



19. Cryptus frater, n. sp. 



Black; legs and the 2nd, 3rd and 4th abdominal segments, rufous; wings 

 subhyaline ; ovipositor short. 



Female. — Black, finely sculptured, slightly pubescent ; face flat, 

 palpi fuscous ; antennje nearly as long as the body, slender, piceous , 

 tinged with ferruginous towards the middle, the joints distinct, 3rd 

 joint longest, 4th slightly shorter, and the remaining joints gradually 

 shorter. Thorax : mesothorax shining, minutely punctured, the dorsal 

 lines not well impressed, under a strong lens distinctly and closely punc- 

 tured ; pleura and pectus minutely striated, subopaque ; metathorax 

 finely rugose, subopaque, near the base a well-defined transverse carina 

 slightly arcuated in the middle, and on each side behind a short carina 

 where the tubercles are usually placed. Wings subhyaline, faintly iri- 

 descent ; nervures and stigma fuscous ; areolet moderate, 5-angular or 

 subquadrate. Legs rufous, their coxae and trochanters black, the pos- 

 terior tarsi slightly dusky. Abdomen, oblong-ovate, very slender at 

 base, polished, black, the 2nd, 3rd and 4th segments rufous; basal seg- 

 ment slender, arcuated, its tip piceous, and on each side of the apical 

 third a stout tubercle, between which there is a deep fovea ; ovipositor 

 short, not as long as the 1st segment of the abdomen, piceous, valves 

 black. Length S\ lines; expanse of wings 5 lines. 

 Hah. — Illinois. Dr. Samuel Lewis. 



20. Cryptus subgracilis, n. sp. 



Rather slender, black; antennae piceous; legs fuscous, the two anterior pairs 

 pale ; abdomen rufous, apex black ; wings fusco-hyaline. 



Female. — Black, slightly pubescent ; head densely and finely punc- 

 tured, face flat, clypeus shining ; antennae nearly as long as the body, 



