. Entomology for medical officers. Insect pests; Insects as carriers of disease. THE ORDER DIPTERA 43 The pupa of the house-fly is an example of a coarctate pupa; that of the mosquito is an example of an obtected pupa. In some flies ( Sinmliunt, Fig. 33), the pupa is enclosed in a silky cocoon which is spun by the larva as a preliminary to pupation. The mature fly, or imago, escapes from the pupal shell or the puparium in one of two ways. In the case of the coarctate pupa the anterior end of the puparium is usually pushed off by a distensible bladder-like sac, known as the ptilinum (? tttI
. Entomology for medical officers. Insect pests; Insects as carriers of disease. THE ORDER DIPTERA 43 The pupa of the house-fly is an example of a coarctate pupa; that of the mosquito is an example of an obtected pupa. In some flies ( Sinmliunt, Fig. 33), the pupa is enclosed in a silky cocoon which is spun by the larva as a preliminary to pupation. The mature fly, or imago, escapes from the pupal shell or the puparium in one of two ways. In the case of the coarctate pupa the anterior end of the puparium is usually pushed off by a distensible bladder-like sac, known as the ptilinum (? tttIXov = a. plume), which protrudes like a hernia from the " forehead," or front, of the emerging fly (Fig. 9). Junule. puparium Fig. 9.—Blow-fly emerging from Pupal 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 Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
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Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectinsectpests
