ART. 15. REVISION OF ICHNEUMON-FLIES AIUESEBECK. 67 



as long as the body ; the basal flagellar segments of antennae about 

 equal; mesoscutum closely punctate, coarsely and deeply so in the 

 shalloAv depression just before the posterior margin; disk of scutel- 

 lum apparently a little longer than broad at base, with a pronounced 

 pitted groove just inside the lateral margins, leaving the margins as 

 sliarp ridges, and setting off a smaller triangular elevated area 

 within; mesopleurae closely punctate and dull anteriorly and below 

 the longitudinal crenulate furrow, highly polished above it; pro- 

 podeum coarsely rugoso-reticulate with a prominent median longi- 

 tudinal carina; radius directed strongly outward, and very slightly 

 longer than the first intercubitus ; outer spur of posterior tibiae 

 distinctly a little longer than the inner, and much less than half 

 as long as the metatarsus ; abdomen a little shorter than the thorax, 

 narrow at base, very broad on the third segment; first dorsal ab- 

 dominal i^late slender, broadest at base, narrowing a little posteriorly, 

 twice as long as broad at base, rugulose; remainder of dorsum of 

 abdomen smooth and polished; membranous margins along the first 

 plate very narrow, except on the apical third; hypopygium not 

 attaining apex of abdomen; ovipositor sheaths subexserted, straight. 

 Black; clypeus, mandibles, and antennae black; labrum blackish; 

 palpi pale, except at base; tegulae black; wings weakly infumated, 

 the veins and stigma dark brown, the latter indistinctly paler at 

 base; all coxae, basal segment of trochanters, base of fore and middle 

 femora, and base and lower edges of posterior femora, black; all 

 tarsi dusky, abdomen entirely black above and below. 



Cocoon. — 3.5 mm. long; cylindrical ; not ribbed ; pale grayish-brown 

 in color. 



Type locality. — ISIissoula, Montana. 



Tyfc.—Q^t. No. 24009, U.S.N.M. 



Host. — Geometrid larva on alfalfa. 



Described from one specimen reared from an almost mature 

 geometrid larva feeding on alfalfa, by W. H. Larrimer. The par- 

 asitic larva emerged from its host and spun cocoon April 16, 1916 ; 

 eight days later the adult issued. 



28. MICROPLITIS LATICINCTUS, new species. 



Nearest to varicolor Viereck, from which it differs in its larger size ; 

 in the first dorsal abdominal plate not narrowing so strongly to the 

 apex; in the second plate not being triangular; in the hypopj^gium 

 of the female distinctly extending beyond the apex of the last dorsal 

 abdominal segment; and in the slightly shorter metacarpus. 



Kemale. — Length 3.5 mm. Head large, rather broad behind the e3'es ; 

 the entire face, the vertex, temples and cheeks closely confluently 

 punctate and dull ; antennae very long, decidedl}'^ longer than the 

 body: mesoscutum very closely confluently punctate and opaque, with- 



