. The Cattle grubs or ox warbles, their biologies and suggestions for control. Warble flies; Cattle; Insect pests. 30 BULLETIN 1369, U. S. DEPARTMENT OF AGRICULTURE FIFTH STAGE The fifth or last larval stage of H. lineatum (fig. 16, a-c) tapers considerably toward the anterior extremity from about the eighth segment. The size of the larva varies from about 16 to 26 millimeters in length and from 7 to 11 milli- meters in width. The surface is more rugged than in the preceding stages, especially on the sides. The spinous armature is heavy; and, although varying greatly with different specimens o
. The Cattle grubs or ox warbles, their biologies and suggestions for control. Warble flies; Cattle; Insect pests. 30 BULLETIN 1369, U. S. DEPARTMENT OF AGRICULTURE FIFTH STAGE The fifth or last larval stage of H. lineatum (fig. 16, a-c) tapers considerably toward the anterior extremity from about the eighth segment. The size of the larva varies from about 16 to 26 millimeters in length and from 7 to 11 milli- meters in width. The surface is more rugged than in the preceding stages, especially on the sides. The spinous armature is heavy; and, although varying greatly with different specimens on the dorsal and lateral sides, it is constant. Fig. 11.—Second-stage larva of Hypoderma lineatum in submucous tissues of gullet. Enlarged ventrally on the posterior borders of segments 2 to 10, inclusive, and presents an excellent distinguishing characteristic for this species. The posterior stig- mal plates are somewhat kidney shaped, flat, or slightly excavated toward the pseudostigmatic orifice, and have radiating furrows which are very distinct in the younger specimens (figs. 16, d; 17).. 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 Bishopp, F. C. (Fred Corry), 1884-1970. Washington, D. C. : U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, booksubj, booksubjectinsectpests
