. Circular. Insect pests; Insect pests. and gradually darkens, ultimately becoming almost black in color. This contracted and hardened larva is what is known as the puparium, which, except for its changed color, texture, and shape, preserves all of the characteristics of the larva. From three to six weeks later the perfect fly escapes by pushing off a sort of circular piece or cap at one end of the puparium. The illustration (fig. 9) represents this stage in the allied species, hovis. The establishment of the wandering habits of the larva in its early stages and the fact of its entrance into t
. Circular. Insect pests; Insect pests. and gradually darkens, ultimately becoming almost black in color. This contracted and hardened larva is what is known as the puparium, which, except for its changed color, texture, and shape, preserves all of the characteristics of the larva. From three to six weeks later the perfect fly escapes by pushing off a sort of circular piece or cap at one end of the puparium. The illustration (fig. 9) represents this stage in the allied species, hovis. The establishment of the wandering habits of the larva in its early stages and the fact of its entrance into the animal through the mouth and esophagus, instead of the skin of the back, is l)ased on carefid experiments and examinations conducted by Doctor Curtice, and is apparentl}' now well established, though difl'ering so radically from llie. Fig. 8.—Hypoderma Unealu: a, second stage of larva from liack; h and c, cnlar d, ventral view of third stage with details of extremities at c and/; g, dorsal vie enlargement of anal spiracles at 7;; j, the same, lateral view—natural size indie: Insect Life). gement of e w of mature ited 1)V side X t rem i ties; larva with lines (from views formerly held. The wandering lia])its of this larva are further indicated by a number of well-authenticated cases of its occurrence beneath the skin of the human subject. There it has usually exhib- ited a similar wandering tendency, in one instance having covered a distance of several yards before being removed. This ])articular larva is represented in the accompanying illustration (fig. 10). Its entrance into the human subject can be easily accoimted for by sup- posing it to be taken with milk. In general appearance and size, the adult insect, roughly speaking, is not unlike the common honeybee. It is about one-half an inch long, the general color black, and is clothed with yellowish white and reddish brown and black hairs. The margin of the head and thorax and a band on the base of the abdomen are cove
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectinsectpests
