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By Charles T Brues

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C Antenne shorter than the front femora. . . . . . . . . . f. c. Tertex and front forming together a rounded surface, the front vertical . . . . . . . . . . . . . . . . . . . . . . . d Vertex and front meeting at an angle, the surfaces of the two forming an angle when seen in profile. . . . . . . . . . . . . e d. A n t e n n ~clavate, as long as the body; apterous species. ) . . . . GOMPHOMASTACINB Antennc not clavate, shorter; usually wing$ species.

2 14. 15. 16. 17. 18. 19. Figs. 14-19, Collembola Isotoma (Imms) Entomobryidae. Tomocerus (Folsom) Entomobryids. Sminthurus (Sharp) Sminthuridae. Tomocerus, hind leg. (Ewing) Entomobryidse. Onychiura, hind leg. (Ewing) Onychiuride. Anoura (Tillyard) Poduridae. Abdomen with the segments fused; divided into two portions; a very large basal one and a small apical one often separated by a constriction; body subglobular, the abdomen little longer thap wide; body never with scales.

35 Mouthparts mandibulate, formed for chewing (if body is covered with scales, see Thysanura). . . . . . . . . . . . . . 38 Mouthparts haustellate, formed for sucking. . , . . . . . . 57 35. Abdomen consisting of ten to twelve segments, no ventral sucker a t its base, no terminal springing apparatus. . . . . . . . 36 Abdomen consisting of six segments or less, with a forked sucker a t base below and usually with a springing apparatus (furcula) near the tip beneath; cerci absent, COLLEMBOLA (Page 44) 36.

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CLASSIFICATION OF INSECTS by Charles T Brues


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