. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 95 BB. Body not covered with scales. C. Caudal appendages many-jointed.—Campodcidce. CC. Caudal appendages sickle-shaped.—Japygidce. AA. Abdomen with not more than six segments; antennae with not more than eight joints; no caudal appendages.—Collembola Order. B. Ventral spring present. C. Spring on penultimate abdominal segment. D. Abdomen globular.—Sminthuridce. DD Abdo
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. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 95 BB. Body not covered with scales. C. Caudal appendages many-jointed.—Campodcidce. CC. Caudal appendages sickle-shaped.—Japygidce. AA. Abdomen with not more than six segments; antennae with not more than eight joints; no caudal appendages.—Collembola Order. B. Ventral spring present. C. Spring on penultimate abdominal segment. D. Abdomen globular.—Sminthuridce. DD Abdomen cylindrical.—Enlomobryidce. CC. Spring on antepenult abdominal segment.—Podurida. BB. Ventral spring absent.—Aphorurida. Of the above Apterous families only one, the LepismidcB of the Thysanura, contains forms that are of economic importance. ORDER THYSANURA LEPISMIDiE (Fish-moths) The Fish-moth, Silver Fish, or "SUcker" Linn.) sometimes does injury to books, papers, labels and starched clothing. It shuns light and is quite active. Adult.—A minute, glistening, scaly, fish- like active insect, wingless, 3^^ inch long, body tapering to hind end where are three long, bristle-shaped appendages; antennae prominent; coxae strongly developed; biting mouth parts. Another species, Lepismadomestica Pack., is found in bakeries and mills in some locali- ties. It has dusty markings on its upper surface and is 3-^ inch long. Control.—Frequent use of fresh insect powder, sodium fluoride, or a poison-bait of sweetened gluey paste and white arsenic on bits of cardboard. {Lepisma saccharina. PODURID^ (Springtails) IT Fig. 50.—The silver fish {Lepisma saccharina). {After Marlatt.) Two species may be noted in passing: Achorutes armatum sometimes attacking seedlings causing disfigure- ment and loss, and A. nivicola often abundant in maple sap in early spring. Both species are minute, and have some of the habits of flea-beetles (Fig, 51).. Please note that these imag