1865.] % 39 



dusky. Abdomen shining, the base and apex of the segments rather 

 strongly contracted and the disk somewhat flattened, making the sides 

 of the segments prominent, or subtuberculate ; on each side of the se- 

 cond segment at tip, a transverse black spot ; apical segments tinged 

 with yellowish ; ovipositor one-fourth longer than the body, piceous ; 

 valves black. Length 8 lines ; expanse of wings 14 lines. 

 Collection. — Ent. Soc. Philad. One specimen. 



EPIRHYSSA, nov. gen. 

 This genus differs from Rhyssa only in the shorter and stouter an- 

 tenuae. in the absence of the areolet of the wings, and in the somewhat 

 shorter segments of the abdomen ; the mesothorax is also more gibbous 

 and rather more deeply striated ; otherwise the structure is the same. 

 The males have the abdomen not longer than twice the length of the 

 head and thorax, subcylindric, and sometimes subclavate ; the antennae 

 are longer than those of the female, but never so slender as those of 

 Rhyssa. 



Epirhyssa speciosa, n. sp. 



Yellow; antennae blackish, with a yellowish annulus; mesothorax brown, 

 with two yellow stripes; sutures of the pleura and base of the three first seg- 

 ments of abdomen, brown; apex of abdomen rufo-fulvous ; wings yellowish- 

 hyaline; ovipositor black, valves honey-yellow. 



Female. — Slightly pubescent. Head yellow, shining ; tips of man- 

 dibles, a band across the vertex covering the ocelli and the upper part 

 of the occiput, blackish or brown; antennae about two-thirds the length 

 of the body, brown-black, the basal joints beneath yellowish, and slightly 

 beyond the middle, a broad yellowish annulus. Thorax yellow, po- 

 lished ; mesothorax gibbous, transversely striated, the middle lobe 

 rather strongly produced in front, brown, anterior margin yellow, lateral 

 lobes brown, the lateral margins yellow ; sutures between the pectus, 

 pleura and metathorax, brown ; scutellum yellow, its extreme tip black- 

 ish; metathorax yellow, smooth and polished, the sutures at base and 

 apex blackish. Wings ample, yellowish-hyaline, with a splendid golden 

 gloss, apex faintly clouded ; nervures and stigma fulvous. Legs yellow, 

 the posterior coxas and femora tinged with ferruginous; tips of all the 

 tarsi blackish. AJbdomen smooth and polished, about twice the length 

 of the head and thorax, gradually thickened towards the tip which is 

 slightly compressed, basal segment slightly longer than wide, apical 

 ones shorter; three first segments yellow, their basal half brown and 

 their extreme apical margins blackish ; fourth and following segments 

 yellowish-fulvous, the fourth having on each side near the tip, a large, 

 subtriangular. yellow spot, almost confluent on the disk; ovipositor 



