AMERICAN IIYMENOPTERA. 143 



Descriptions of new species belonging to the sub-family PIMPLARI^ 

 found in America north of Mexico. 



BY E. T. CRESSON. 



ACffiNITES, Grav. 

 Acoenites rupinsulerisis, "Walsh. MS. — 9- — Entirely pale honey-yellow, pol- 

 ished ; anteniuB blackish at base above, short, witli thick set joints ; tip of man- 

 Hibles and vertex black; legs short, posterior femora swollen; wings hyaline. 

 Length 4 lines. 



Hah. — Illinois. Sent me by ]Mr. Walsh named as above, along 

 with other Ichneumon id;Ti with MS. names attached. Now that he is 

 gone. I hesitate no longer to describe them, always adopting his names 

 when not pre-oceupied, and recognizing him as the discoverer of the 



species. 



EPHIALTES, Grav. 

 Ephialtes perlongus, n. sp.— '£ .—Head and thorax black, polished; antenna 

 black; palpi white; abdomen very long, slender, cylindrical, piceous-black, 

 pale at base of segments, alutacoous, first segment elongate, bicarinate, deeplv 

 excavate at base, the following segments at least twice longer than broad, seg- 

 ments 2 and 3 with a lateral deeply impressed line; face with a dense pale 

 sericeous pile ; legs honey-yellow, tips of posterior femora and their tibise and 

 tarsi entirely, fuscous, sericeous; wings hyaline, beautifully iridescent. Length 

 54 lines. 



Hab. — 3Iassachusctt3. 



Ephialtes albipes, n. sp. — 9* — I^ong, slender, black, opaque, pale sericeous 

 in certain lights; i)alpi, scape beneath, tegula; and four anterior coxae and legs, 

 white; posterior coxse and femora honey-yellow, their trochanters white, with 

 a black spot above, their tibia; and tarsi fuscous, the former whitish at base; 

 wings hyaline, beautifully iridescent; abdomen sub-cylindrical, surface 

 smooth, without any elevations or depressions, the second, and following seg- 

 ments about twice longer than broad; ovipositor shorter than abdomen, the 

 sheaths scarcely pubescent. Length 4i lines. 



Hub. — New Jersey. 



EPIMECIS, Brullo. 

 E. Wiltii, n. sp. — J. — Pale honey-yellow, polished; head, except month, 

 and palpi black ; antennte nearly as long as the body, brown-black : wings yel- 

 low-hyaline, iridescent, with a fuliginous band across the middle, cmarginate 

 outwardly, and a broad one at tip, ncrvures and stigma yellow except within 

 the fuliginous band; tips of tarsi dusky; four apical segments of abdomen 

 dusky (probably discolored); ovipositor exserted half the length of abdomen, 

 ferruginous, valves black. Length 7 lines. 



Hub. — Ohio. Chnsely allied to /ascijjennis, Cresson, from Cuba, 

 whicli is smaller, and has the outer margin of the median fuliginous 

 band on anterior wing perfectly straight and not eniarginate as in 

 HY//(V, and the posterior tibiiu and tarsi are entirely fuscous. 



Dedicated to Mr. Charles Wilt, to whom the Society is indebted for 

 the unique in its collection. 



