. Elementary entomology . n m n o p q r s FIG. 55. Eggs of different insects. (Enlarged) a, Tortrix; b. Lifaris: r. a Xoctuid : </, usual shape of those of a bark borer; <?, May-beetle (Lachnosterna); _/", midge (Chironmnus); g, Lyda : //, fly (Afusca) ; /, honey-bee : /£, gall-fly (Rhodites rosae] ; /, lace-winged fly (Chrysopa) \ m, pomace-fly (Drosophila); ;/, Pentatoma; o, back-swimmer (Nepa}; /, butterfly (Picris crataegi); ^, bedbug; ;-, louse, fastened to a hair; j, bot-fly (HypodermcC). (After Judeich and Xitsche, from Packard) are laid upon the food plant, or host, but occa
. Elementary entomology . n m n o p q r s FIG. 55. Eggs of different insects. (Enlarged) a, Tortrix; b. Lifaris: r. a Xoctuid : </, usual shape of those of a bark borer; <?, May-beetle (Lachnosterna); _/", midge (Chironmnus); g, Lyda : //, fly (Afusca) ; /, honey-bee : /£, gall-fly (Rhodites rosae] ; /, lace-winged fly (Chrysopa) \ m, pomace-fly (Drosophila); ;/, Pentatoma; o, back-swimmer (Nepa}; /, butterfly (Picris crataegi); ^, bedbug; ;-, louse, fastened to a hair; j, bot-fly (HypodermcC). (After Judeich and Xitsche, from Packard) are laid upon the food plant, or host, but occasionally their position could not be accounted for were the habits of the young not known. The number laid by a female may vary from one or two, as in the case of some aphides, to many thousands, as in bees and termites, but a fair average would probably be about one hundred. The size varies inversely with the number produced, and the shape and struc- ture are largely influenced by the environment in which the eggs are laid. In a few cases the eggs hatch within the body of the female, which thus gives birth to live young, as do the aphides. Those eggs which hatch during the summer have an incubation period of from a day or two, as do those of certain flies and mosquitoes, to 45
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