. Bulletin of the Department of Agriculture. Agriculture. 10 BULLETIN 19, U. S. DEPARTMENT OF AGKICULTUKE. work a groat amount of injury has not been observed. The other species most commonly found associated with T. comes is T. tricincta Fitch (fig. 6,6), Tliis species, when present, is more hkely to be found on the foUage of Delaware, Catawba, Brighton, and some of the wild species of grapevine growing along ravines or in woodlands. It is readily distinguished from comes by the larger size and by the fact that it has three broad black bars situated as follows: One just back of the head,
. Bulletin of the Department of Agriculture. Agriculture. 10 BULLETIN 19, U. S. DEPARTMENT OF AGKICULTUKE. work a groat amount of injury has not been observed. The other species most commonly found associated with T. comes is T. tricincta Fitch (fig. 6,6), Tliis species, when present, is more hkely to be found on the foUage of Delaware, Catawba, Brighton, and some of the wild species of grapevine growing along ravines or in woodlands. It is readily distinguished from comes by the larger size and by the fact that it has three broad black bars situated as follows: One just back of the head, another about midwaj^ across the elytra, and. Fig. 6.—The two species of grape leafhopper most common in vineyards of the Great Lakes Region: a, Typhloct/ba comes; b, Typhlocyba tricincta. Greatly enlarged. (Original.) the tliird at the tips of the elytra. Nymphs of tricincta (fig. 7) have two black spots back of the eyes and two on the thorax. Wliile making trips through the vineyard areas along the shore of Lake Erie as far west as Sandusky, Ohio, it was observed that in the Ohio vineyards east of Cleveland Typlilocyha tricincta was present in greater numbers than in the vineyards of Chautauqua County, N. Y., and of Erie County, Pa., although more than 80 per cent were still Typhlocyba comes. In the vineyards west of Cleveland T. tricincta. 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 Department : Supt. of Docs. , Govt. Print. Off.
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