AET.15. REVISION OF ICHNEUMON-FLIES MUESEBECK. l7 



with only a few weak punctures; inner spur of posterior tibiae half 

 as long as the metatarsus; abdomen about as long as thorax and 

 somewhat compressed; first dorsal abdominal plate slender, distinctly 

 a little narrower at apex than at base, smooth and polished down 

 the middle, punctate or weakly striate laterally ; second dorsal plate 

 subtriangular, as broad at base as long down the middle, defined 

 laterally by oblique grooves; like the first plate, the second is mostly 

 smooth and polished, being only slightly punctate or striate at the 

 sides; remainder of abdomen smooth and polished; hypopygium 

 large, but not surpassing the apex of the last dorsal abdominal seg- 

 ment; ovipositor sheaths at least two-thirds as long as the abdomen, 

 broad, of nearly uniform width throughout, and strongly curved 

 downward; the ovipositor likewise strongly curved on its apical 

 half. Black ; mandibles more or less reddish, the palpi pale ; antennae 

 black, except the pedicel, which is dark brown ; tegulae pale yellow ; 

 wing-bases brown; wings hyaline or subhyaline, the costal margin 

 and veins largely yellowish ; stigma pale brown ; legs entirely testa- 

 ceous, except base of the posterior coxae, which is black, and the 

 apical segments of posterior tarsi, which are slightly brownish; 

 dorsum of abdomen black, except the broad membranous margins 

 along the two basal plates, which are brownish-testaceous, and more 

 or less of the sides and the apical margin of the third tergite, which 

 are brownish; sides of venter of abdomen testaceous except at apex; 

 ventral keel and ovipositor sheaths black. 



Male. — Essentially as in the female; the enormous, broad clasp- 

 ers of the genitalia protruding more than half the length of the 

 abdomen will readily distinguish this species from the male of any 

 other Apanteles known to me. 



Type. — Cat. No. 568, Cornell University Collection. 



Paraty pes. —C?it. No. 24330 U.S.N.M. 



Type locality. — Carhonate, British Columbia. 



Other localities. — Cheyenne, Wyoming; Yellowstone ^ake, Mon- 

 tana ; and Mica, Washington. 



Described from the following material : One female and two male 

 specimens collected by Dr. J. C. Bradley, at Carbonate, British Co- 

 lumbia, July 7-12, 1908, altitude 2,600 feet; one male specimen col- 

 lected by Fanny T. Hartman at Cheyenne, Wyoming, June-August, 

 1907 ; three females collected by A. L. Melander at Mica, Washing- 

 ton, July 14, 1916; and one male taken by Doctor Melander at 

 Yellowstone Lake, Montana. The female and two of the males 

 from British Columbia and the male from Wyoming are in the 

 Cornell University Collection; one male from British Columbia 

 and a female from Mica, Washington, are in the United States Na- 

 tional Museum; the remaining three specimens are in the collection 

 of Dr. C. T. Brues, of Harvard University. 



