Principal household insects of the United States . last described. In common with the silver21740—No. 4 0 82 PRINCIPAL HOUSEHOLD INSECTS. fish, it belongs to the order of insects known as Aptera (wingless), fromthe fact of their having no vestige of wings throughout life. The simple structure of these insects, and particularly their resem-blance to the larval state of winged insects, has led to the belief thatthey are the primitive forms of insect life. That this is true is, however,by no means certain, and they may rather be degraded or debasedexamples of some of the higher orders of insects.
Principal household insects of the United States . last described. In common with the silver21740—No. 4 0 82 PRINCIPAL HOUSEHOLD INSECTS. fish, it belongs to the order of insects known as Aptera (wingless), fromthe fact of their having no vestige of wings throughout life. The simple structure of these insects, and particularly their resem-blance to the larval state of winged insects, has led to the belief thatthey are the primitive forms of insect life. That this is true is, however,by no means certain, and they may rather be degraded or debasedexamples of some of the higher orders of insects. The species figuredherewith is not infrequently found in dwellings in Washington, but isapparently undescribed, and, in fact, little is known of the Americanspecies. It is, however, closely allied to a European form (L. cervicalis),often found in cellars, and figured by Sir John Lubbock in his mono-graph on these insects (PI. XXV). Another allied European species(Seira domcstica) has been named from the fact of its being a frequenterof
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