Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . FIG. 139.—Side view of a labellum. ca, chitinous arch supporting the falsetracheae (pi).—After Kraepelin. tions in the soiled and spotted appearance which it occasionson them. The thorax is somewhat rounded, and though composedof three rings, yet these are so consolidated that it is at firsthard to identify them. The prothorax is rudimentary, the fset. fc» tr Fio. 140.—Thorax of the house-fly, prn, pronotum; prsc, prasscutum; sc meso-scutum; set, mesoscutellum; psct, postscutellum; al, insertion of te
Entomology for beginners; for the use of young folks, fruitgrowers, farmers, and gardeners; . FIG. 139.—Side view of a labellum. ca, chitinous arch supporting the falsetracheae (pi).—After Kraepelin. tions in the soiled and spotted appearance which it occasionson them. The thorax is somewhat rounded, and though composedof three rings, yet these are so consolidated that it is at firsthard to identify them. The prothorax is rudimentary, the fset. fc» tr Fio. 140.—Thorax of the house-fly, prn, pronotum; prsc, prasscutum; sc meso-scutum; set, mesoscutellum; psct, postscutellum; al, insertion of tegula, ex-tending to the insertion of the wings, which have been removed; msphr, meso-phragma; h, balancer (halter); pt, patagia; mtn, metanotum; epis, epis,epis, episternum of pro-, meso- and meta-thorax; epm, epm. meso- andmeta-epimerum; st, st, meso- and meta-sternum; ex, ex, ex, coxae; tr,tr, tr, trochanters of the three pairs of legs; sp, sp, sp, sp, sp,first to fifth spiracles; tg, tg, tergites of first and second abdominal seg-ments; M, u, urites. thorax being almost wholly formed of the middle ring(mesothorax). The latter consists of three large upper ORDER DIPTERA. 121 pieces, the prascutum, scutum, and the triangular orshield-shaped scutellum (Fig. 140, set}. To the sides ofthis segment are attached the wings. The third ring(metathorax) is but partly formed, and cannot be seen fromabove. It supports the balancers (Fig. 140,
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
