File:The external and internal parasites of (man and) domestic animals (1870) (14767611515).jpg

Identifier: externalinternal00verr (find matches)
Title: The external and internal parasites of (man and) domestic animals
Year: 1870 (1870s)
Authors: Verrill, A. E. (Addison Emery), 1839-1926
Subjects: Medical parasitology Domestic animals Parasites
Publisher: (Hartford, Conn., Case, Lockwood & Brainard, printers)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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ol-fly of Cattle (Hypoderma hovis Latr). Figures 22, 23. This fly is densely covered with hairs, except upon the thorax, which is partially naked and black, broadly banded with white and yellow. The abdomen is banded alternately with yellowish white and black, and with reddish orange at the end. The front of the head is dirty ashen, with yellowish white hairs. They appear from June to September, and the females lay their eggs on the backs of cattle. According to ■ * One species, Cuterehra emasculator, described by Fitch, lives in the scrotum ofsquirrels, and destroys one or both testicles. In some parts of the country it isoften quite common, and doubtless greatly diminishes the number of squirrels. 20 BOARD OF AGRICULTURE. some writers, they pierce the skin, by means of their peculiargimlet-like ovipositor; but others deny this, and say that tlieeggs are merely attached to the skin, and that the younglarvae, which very soon hatch, eat their way in. At any rate Figure 22. Figure 23.
Text Appearing After Image:
the cattle are often greatly alarmed by their attacks, and runfrantically about, sometimes even taking to the water forsafety, which would hardly be the case unless they had suf-fered pain from their attacks. Working oxen, when thusattacked, sometimes cause serious trouble. The larvae having entered tlie skin increase the size anddeptli of their burrows as they grow larger, but always keepup an opening with the exterior, and keep the posterior endof the body, in which the breathing pores are situated, nearthis opening to get air. In this way they cause, by the irrita-tion and inflammation that they produce, tumors or abscessesof considerable size beneath the skin, and live upon thematter formed by the inflammatory action. When young,they are white, but afterwards become brownish ; when ma-ture, deep brown. Tlioy have transverse rows of minute hooks; the narrowerrows are on the posterior part of each segment, and the hookspoint backward ; those of the wider rows, point forward. These F

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