. Cooperative economic insect report. Beneficial insects; Insect pests. - 858 mainly in the tissues between the mucous membranes and the muscular walls of the gullet. Grubs mature during the late fall, winter, spring and early summer in the subdermal tissues. The larva cuts through the skin on arriving there and within 2-6 days molts. A wall of tissue forms around the larva in the form of an encystment sac. The next molt takes place about 24 hours later. The last instar lasts about 30 days. Then the larva drops to the ground, seeks protection and pupates. The adult emerges 30-60 days later. Ad
. Cooperative economic insect report. Beneficial insects; Insect pests. - 858 mainly in the tissues between the mucous membranes and the muscular walls of the gullet. Grubs mature during the late fall, winter, spring and early summer in the subdermal tissues. The larva cuts through the skin on arriving there and within 2-6 days molts. A wall of tissue forms around the larva in the form of an encystment sac. The next molt takes place about 24 hours later. The last instar lasts about 30 days. Then the larva drops to the ground, seeks protection and pupates. The adult emerges 30-60 days later. Adults mate soon after emergence, and without feeding, begin to oviposit on cattle. There is one generation a year,* the major portion of the life history is spent as a larva in the hosts body. Description: EGG is dull yellowish-white, smooth and shining. LARVAE when newly hatched are about mm. long and mm. wide, creamy or dull white and densely covered with spines. In fifth instar, H. bovis differs from H. lineatum in that it is slightly larger and the posterior stigmal plates are deeply exca- vated or funnel-shaped toward the pseudostigmal orifice. Another outstanding difference is that in H. bovis the mouth hooks are well forked at the anterior end and more truncate at the posterior end. PUPAE almost black, the stigmal plates still separate the species. ADULT of H. bovis is larger and considerably stouter than H. lineatum. In H. bovis, the band of yellowish hairs across the prothorax dorsally is wider and slightly deeper in color. The thorax is much broader and tarsi less hairy. In both species, femora and tibiae are black and well covered with black and yellow hairs, tarsi brown. The terminal abdominal segment of H. bovis has a wider and more sharply defined band of lemon-yellow which is distinctly paler than in II. lineatum. In H. lineatum the body length is about 13 mm. and wing expanse about 25 mm. (Prepared in survey and detection operations in cooperation with
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Keywords: ., bookcentury1900, booksubjectbeneficialinsects, booksubjectinsect
