. Bulletin - United States National Museum. Science. ICHNEUMON-FLIES—GELINAE : MESOSTENINI 89 Figure 33.—Localities for Gamhrus Neck," and Pittsburgh); South Dakota (Black Hills, Brookings, Chamberlain, and Highmore); Utah (Salt Lake City); and Wisconsin. The great majority of the specimens are Imown or suspected to have been reared indoors. The species is presumed to be adult throughout the summer. As an illustration of the scarcity in the field, we ourselves have never collected it. Specimens with host records include 29 lots reared from Hyalophora cecropia, 2 from H. Colum
. Bulletin - United States National Museum. Science. ICHNEUMON-FLIES—GELINAE : MESOSTENINI 89 Figure 33.—Localities for Gamhrus Neck," and Pittsburgh); South Dakota (Black Hills, Brookings, Chamberlain, and Highmore); Utah (Salt Lake City); and Wisconsin. The great majority of the specimens are Imown or suspected to have been reared indoors. The species is presumed to be adult throughout the summer. As an illustration of the scarcity in the field, we ourselves have never collected it. Specimens with host records include 29 lots reared from Hyalophora cecropia, 2 from H. Columbia, and 1 from H. euryalus kasloensis. There have been several publications on the biology of this species, as noted under the synonymy. The papers by Marsh are partic- ularly interesting. In the account given in "Ecology," he relates: As soon as cocoon spinning [of the cecropia] has progressed to a thin-shell stage, females of the ichneumonid have been observed coming up the wind to it as Can- thon beetles follow up wind to fresh horse droppings. The ovipositor is thrust through the cocoon, and eggs are deposited on the inside of the cocoon or on the surface of the larva. Over one thousand eggs have been counted in one early-spun cocoon resulting from the oviposition of several females, while the greatest number of cocoons of [(?.] extrematis in a single Cecropian cocoon was 172. As no starved larvae have been found, cannibalism is indicated. The average infestation of Cecropian cocoons with [G.] extrematis was found to be thirty-three. During oviposition, the host larva is thrust with the ovipositor and invariably dies within a few hours. The larvae of [G.] extrematis move about freely over the dead host larva at first feeding on cuticle, later burrowing down and drinking body fluids. In cases of heavy parasitism all the host body is eaten except the few chitinized parts. In the Chicago area [G.] extrematis is double brooded, completing a cycle in about eightee
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