. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. PARASITES OF GIPSY-MOTH CATERPILLARS. 189. Fig. 28.—Apanteles solitarius: Adult female and cocoon, larged. (Original.) En- On the other hand, studies with the parasites of native insects have revealed the existence of what may be called accidental or incidental parasites. These may be important parasites of one insect and of no importance whatever in connection with another, nearly allied. Sometimes this is due to the fact that the one species of host may excite in the mother parasite the desire to oviposit, whic
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. PARASITES OF GIPSY-MOTH CATERPILLARS. 189. Fig. 28.—Apanteles solitarius: Adult female and cocoon, larged. (Original.) En- On the other hand, studies with the parasites of native insects have revealed the existence of what may be called accidental or incidental parasites. These may be important parasites of one insect and of no importance whatever in connection with another, nearly allied. Sometimes this is due to the fact that the one species of host may excite in the mother parasite the desire to oviposit, which is not excited by the other, and occasionally, as has more than once been observed, the pres- ence of the favored host in the immediate vicinity will induce the parasite to oviposit in another species which under otherwise identical cir- cumstances would be en- tirely ignored. At other times an insect may be acceptable to the mother parasite, but for some reason unaccept- able to her progeny, so that only a very few out of the many eggs which are deposited will go through to maturity, and the species will be of necessity considered as rare and unimportant. The fact that there are included in every list of the parasites of a given host a few species which are thus to be considered as incidental or accidental lends force to the contention that among the recorded parasites of the gipsy moth are several at least which come into the same category. Just which these are is not altogether plain at this time. Apanteles solitarius Ratz. Cocoons of a solitary species of Apanteles (fig. 28) which attacks the very young to half-grown caterpillars of the gipsy moth through- out the greater part if not the whole of Europe have occasionally been received in shipments in which the caterpillars were not all in the last or next to the last stage. In those shipments which consisted of cater- pillars in the third, fourth, and fifth stages at the time of collection, the cocoons of this species h
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