Zöology; a textbook for colleges and universities . From Bulletin 67, U. S. National Museum FIG. 87. A bird louse, Goniodes faki- cornis (Mallophaga). From Bulletin 67, U. S. National MuseumFIG. 88. A head louse, Pediculus capitis(Siphnnculata). Order Siphunculata The true lice, including those infesting is beaklike, adapted for sucking. The PHYLUM ARTHROPOD A 273 Order Thysanoptera Small insects known as thrips, common on flowers. ThripsThey feed on thesap of plants,and are ofteninjurious. Themetamorphosisis quite incom- WingS. 5 xai;a,,al Museum From Buuetinare Usually pres- FIG. 8
Zöology; a textbook for colleges and universities . From Bulletin 67, U. S. National Museum FIG. 87. A bird louse, Goniodes faki- cornis (Mallophaga). From Bulletin 67, U. S. National MuseumFIG. 88. A head louse, Pediculus capitis(Siphnnculata). Order Siphunculata The true lice, including those infesting is beaklike, adapted for sucking. The PHYLUM ARTHROPOD A 273 Order Thysanoptera Small insects known as thrips, common on flowers. ThripsThey feed on thesap of plants,and are ofteninjurious. Themetamorphosisis quite incom- WingS. 5 xai;a,,al Museum From Buuetinare Usually pres- FIG. 89. Tobacco thrips: a, adult; b, antenna of same; ent in the adults, c young larva ; d full-grown larva but many species are wingless. Order Trichoptera The caddis flies, formerly placed with the Neuroptera, Caddis fliesbut really more nearly allied to the Lepidoptera. Thelarvae are aquatic, and usually construct cylindricalcases. In one genus the larva case resembles a snail,and was once described as such by an eminent natural-ist. Some of the adults are so similar to moths as tolead to confusion, but the hind wings are folded length-wise when at rest, which is not true of the Lepidoptera.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
