WALSH — DESCRIPTIONS OF N. AM. HYMENOPTERA. 79 



Section 4. Cresson. — '•'■ Scutellum black; abdomen red^or red 

 and black." 



A. — Antennce not annulate with white ; coxce and trochan^ 

 ters mostly black. 



CryptHS americanus, Cress. — . $ — The antennje are | as long as the 

 body; the ist joint of the flagellum (=3d joint of antennae, Cress.) 5J 

 times as long as wide, the 2d and 3d joints (^4th and 5th of antennae. 

 Cress.) each } shorter than the preceding, so that the 3d joint is y\ or ra- 

 ther more than h as long as the 2d ; the rest gradually shorter and shorter. 

 In the metathorax the lateral areas, except their outer sides as well as 

 their cross-carinae, are distinct; there is a small subquadrate basal area; 

 a large equilaterally obtrigonate central area separated from the poste- 

 rior area by a robust cross carinae ; and not only do the tips of the lateral 

 areas terminate in an acute thorn, but the outer tips of their cross-carinae 

 project in a small, robust tooth. The areolet is pentagonal, its inner and 

 outer sides the longest, its anterior side the shortest. The radial area is 

 elongate, having a posterior angle of 135°; and the ist recurrent vein is 

 angulated at 135° with a stump of a vein at the angle. Legs black; tips 

 of the 4 front femora, especially the anterior ones, shading into rufous; 

 all 6 tibiae and tarsi pale fuscous, tinged, especially in the front legs, with 

 rufous. First abdominal joint with its carinae extending | of the way to 

 the tip. Length $ .37 (.25-.50 Cress.) inch. Front wing 5 .30 inch. 

 Ovip. .23 inch. 



One ? ; (? unknown to me. By some clerical or typographi- 

 cal error the ovipositor in Mr. Cresson's diagnosis is said to be 

 "as long as the body," instead of "as long as the abdomen," as is 

 correctly stated in his description and also on p. 300. Precisely 

 the same error is repeated in the diagnosis of his Cr. persimilis^ 

 In this species all the tibiae have an irregular double external row 

 of minute thorns as in several of the following species in Cr. ro^ 

 bustus^ Cress., and in Phytodietus, Grav. 



CryptUS persimilis, Cress. — $. — The antennae are § as long as the bo- 

 dy, the 1st joint of the flagellum (= 3d joint of antennae. Cress.) only 4 J 

 times as long as wide, the following joints proportioned as in america- 

 nus. The metathorax differs from that of americanus in the basal and 

 central areas being subobsolete except the posterior carina of the latter, 

 and in the cross-carinae of the lateral areas not projecting laterally in a 

 distinct tooth. Areolet as in americanus, except that its anterior side is 

 usually no shorter than either one of the two posterior sides. First recur- 

 rent vein usually with a stump of a vein at its angle. Abdomen as in 

 americanus, except that the basal f of joint i is either entirely or laterally 

 black. Length $ •Z'^'ZI ('33 Cress.) inch. Front wing $ .23-26 inch. 

 Ovip. .20 inch. 



