Report on the Rocky Mountain locust and other insects now injuring or likely to injure field and garden crops in the western states and territories . >ly in excessive quantities. Mr. Curtis remarks that some species of this extensive genus (Pteromalus), probably comprising 748 REPORT UNITED STATES GEOLOGICAL nearly 1,000 species (!), swarm even in our houses, especially in the coun-try, where in October and November I have seen immense numbers in-side of the windows, and 1 believe that they hibernate behind the shut-ters, in the curtains, etc. Were it not for the native ichneumon p
Report on the Rocky Mountain locust and other insects now injuring or likely to injure field and garden crops in the western states and territories . >ly in excessive quantities. Mr. Curtis remarks that some species of this extensive genus (Pteromalus), probably comprising 748 REPORT UNITED STATES GEOLOGICAL nearly 1,000 species (!), swarm even in our houses, especially in the coun-try, where in October and November I have seen immense numbers in-side of the windows, and 1 believe that they hibernate behind the shut-ters, in the curtains, etc. Were it not for the native ichneumon parasite, (Fig. IG, a, male; fe, female,) which has been found to prey uponit very extensively, the cultivation of thecabbage would have to be given up in sometiistricts. This invaluable ichneumon is oneof the chalcid family, and is the Pterom-ah(Spuparum oH Linnaeus. It is well knownthat the cabbage-caterpillar (Pie*-;,* rapw)was introduced into this country about theyear 1857. I had supposed that the par-asite had perhaps been imported with itshost, but now find that it is undoubtedly anative of this country as well as been favored by Mr. Francis Walkerwith s|3ecimens of both sexes from England,labeled by him Pt. 2nq)arum, I found thatour specimens did not differ , Mr. Walker
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