. Bulletin of the Department of Agriculture. Agriculture; Agriculture. HORSE-FLIES AND WESTERN AGRICULTURE. 21 Front gray, a little converging; ocellar tubercle distinct; callosity nearly square, with a spindle-shaped prolongation above; antennae black: third joint rather narrow, its upper angle very little projecting; thorax grayish-black,. 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 United States. Dept. of Agricu
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. HORSE-FLIES AND WESTERN AGRICULTURE. 21 Front gray, a little converging; ocellar tubercle distinct; callosity nearly square, with a spindle-shaped prolongation above; antennae black: third joint rather narrow, its upper angle very little projecting; thorax grayish-black,. 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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