. Flies in relation to disease: bloodsucking flies. Flies; Flies as carriers of disease; Diptera. -^^'^] LIFE HISTORY 3gg The larva escapes by splitting the egg membrane at the broad end of the groove. During August, with an average tempera- ture of 72° F. m the day and 65° at night, the incubation period varies from two to three clays. The young larva is round, smooth, and almost transparent, and of the usual acephalous muscid type (Fig. 6, p. 20). It may be distinguished by the appearance of the two posterior stigmata, which are small, circular and situated rather far apart. Its length when
. Flies in relation to disease: bloodsucking flies. Flies; Flies as carriers of disease; Diptera. -^^'^] LIFE HISTORY 3gg The larva escapes by splitting the egg membrane at the broad end of the groove. During August, with an average tempera- ture of 72° F. m the day and 65° at night, the incubation period varies from two to three clays. The young larva is round, smooth, and almost transparent, and of the usual acephalous muscid type (Fig. 6, p. 20). It may be distinguished by the appearance of the two posterior stigmata, which are small, circular and situated rather far apart. Its length when full grown is about 11 mm. The duration of. Fig. 84. Stomoxys calcitrans. The small group in the top left hand corner represents their natural size. (After Newstead.) the larval stage under favourable conditions, is from two to three weeks, but the absence of plentiful moisture or exposure to light retards the development very considerably, to at least a period of 78 days. Such larvae produce abnormally small pupae and correspondinglj' small adults. The process of pupation is completed within two hours. The larva first burrows to some httle depth and then shortens itself by contraction of the front segments, thus becoming barrel-shaped (Fig. 9, p. 22). The colour of the pupae is at first terra-cotta, but it subsequently darkens to a chestnut-. 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 Hindle, Edward, 1886-. Cambridge, University Press
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectdiptera
