. Zoology for high schools and colleges. Zoology. THE HESSIAN-PLY. 357 the larva state. They may be recognized . as greenish maggots living among groups of plant- lice. In the two-winged gall- flies (Fig. 345, Cecidomyia destructor Say, or Hes- sian-fly) the body is small and slender, with long antennae. The crane-flies {Tipula) are large flies, standing near the head of the order, and, like the gall - fly, the chry- salis has free append- ages, there being n o puparium or pupa-case, as in the lower flies. Lastly, we have the mos- quito (Pigs. 346 and 347), whose larva is aquatic, and breathes
. Zoology for high schools and colleges. Zoology. THE HESSIAN-PLY. 357 the larva state. They may be recognized . as greenish maggots living among groups of plant- lice. In the two-winged gall- flies (Fig. 345, Cecidomyia destructor Say, or Hes- sian-fly) the body is small and slender, with long antennae. The crane-flies {Tipula) are large flies, standing near the head of the order, and, like the gall - fly, the chry- salis has free append- ages, there being n o puparium or pupa-case, as in the lower flies. Lastly, we have the mos- quito (Pigs. 346 and 347), whose larva is aquatic, and breathes by a process on the end of the body, containing a trachea. Order 15. Lepidoptera. — The butterflies and moths form a well-defined group, and are known by their scaly bodies (Pig. 348), the spiral maxillae or tongue, rolled up between the two large labial palpi, and their usually broad wings. As the butterfly, the type of the order, has been described at some length, we will only enumerate some of the. Fig. 346.—Hessian-fly. a, larva; 6, pupa; c. incision in wheat stalk for larva. (Mag- nlfled).—After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Packard, A. S. (Alpheus Spring), 1839-1905. New York, H. Holt and Company
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