•506 [September 



2o. Cryptus incertus, n. sp. 



Black; anteuuse slightly annulated with white; legs and abdomen bright 

 rufous, the 3 apical segments of the latter black, the terminal one with a large 

 white spot above; wings fusco-hyaline. 



Female. — Black, finely and densely punctured, subopaque. slightly 

 pubescent; face flat; clypeus shining; mandibles rufous in the middle; 

 palpi piceous ; antennae slender, two-thirds the length of the body, 

 piceous, paler beneath towards the base and again towards the tip, about 

 the middle above a small whitish annulus, 3rd and 4th joints long and 

 subequal, 5th joint shorter, the 6th shorter than the 5th. Thorax 

 finely rugose, the mesothorax indistinctly so, the dorsal lines not well im- 

 pressed ; meiathorax more coarsely rugose, or reticulated, near the base 

 a slight transverse carina, and about the middle another one strongly 

 arcuated anteriorly and ending on each side in a prominent flattened 

 ridge or tubercle; tegulae rufous. Wings subhyaline, uniformly tinged 

 with pale fuscous, slightly iridescent; nervures and stigma fuscous; 

 areolet large, subquadrate. Legs, with their coxae, bright rufous; tips 

 of the posterior femora black, tips of their tibiae and of all the tarsi 

 dusky. Abdomen oblong-ovate, strongly arcuated at base, smooth and 

 polished, bright rufous; apical margin of the 4th segment, and the re- 

 maining segments entirely, except a large white spot on the 7th seg- 

 ment above, black ; ovipositor more than half the length of the abdo- 

 men, rufo-piceous, valves black. Length 3| lines, expanse of wings 6 

 lines. 



Hah. — Delaware. Dr. Thomas B. Wilson. 



Closely allied to C idtimu'i^ but the antennae are longer, with a slight 

 white annulus, the wings darker, and the abdomen not so robust. 



24. Cryptus alacris, n. sp. 



Black: annulus on antennae and spot on tip of abdomen, white; legs and 

 three basal segments of abdomen, rufous : wings hyaline; ovipositor as long as 

 the abdomen. 



Female. — Black, shining, slightly pubescent; mouth piceous, palpi 

 pale ; antennae more than half the length of the body, rather slender, 

 black, with a whitish annulus about the middle, basal joints beneath 

 sometimes pale rufous. Thorax minutely punctured ; mesothorax 

 smooth and polished ; a line over the collar, sometimes subobsolete, and 

 tegulae, whitish ; metathorax subopaque, minutely rugose, the elevated 

 lines longitudinal and subobsolete, the posterior face deeply excavated, 



