Cet he he 
ee ee 
THE GRAPE-LEAF SKELETONIZER. 79 
The latest economic reference is that of J. B. Smith (1903), who 
figures it as one of the insects sometimes troubling grapes. 
ORIGIN AND DISTRIBUTION. 
The grape-leaf skeletonizer is probably a native species, from the 
fact that it feeds upon Virginia creeper and wild grapes in addition 
to the domestic varieties of grape. Harris mentions it as related to 
Procris ampelophaga, of Europe, which is injurious to the vineyards 
of Piedmont and Tuscany, and Riley states that it is related to the 
European Procris vitis. 
In literature it has been recorded from the following States and 
Provinces: Canada (Bethune); New England (Walsh); New York 
(Slingerland) ; New Jersey (Smith); Washington, D. C. (Glover) ; 
North Carolina (Walsh) ; Georgia (Starnes) ; Florida (Neal) ; Ohio 
(Lintner) ; Missouri (Riley); and Arizona (Toumey). 
In the files of the Bureau of Entomology there are records as fol- 
lows: Orange, N. J.; Dalton, Philadelphia, and Williamsport, Pa.; 
Berwyn, Cambridge, Sharptown, and Sullivan, Md.; Washington, 
D. C.; Afton, Va.; French Creek and Lewisburg, W .Va.; Raleigh, 
N. C.; Columbia and Timmonsville, 8. C.; Poulan, Ga.; Jackson- 
ville, Oakland, Stephensville, and Umatilla, Fla.; Auburn, Ala.; 
Masengale and Poplarville, Miss.; Mandeville and New Orleans, La., 
and Hermosillo, Mexico. 
FOOD PLANTS AND DESTRUCTIVENESS. 
Harris states that this species feeds very readily upon Ampelopsis 
quinquefolia; Riley writes that its natural food is Virginia creeper 
and wild grapes: while both record it as being fond of cultivated 
grapes. Toumey states that it was found upon Vitis arizonica, and 
Neal records it as living naturally upon wild grapes and Virginia 
creeper but that it prefers cultivated grapes, especially if exotic or 
choice. Riley mentions that a Mr. Jordan, of St. Louis, Mo.; states 
that it attacks Concords but never the Clinton or Taylor varieties in 
his vineyards. During the past summer the writer noticed that it was 
especially fond of certain hothouse varieties in an abandoned green- 
house upon the Department grounds. 
CHARACTER OF INJURY. 
The young larve during the first three or four instars feed only 
on the outer epidermal layer of the leaf, completely skeletonizing it. 
(See fig. 12.) This is done on both the upper and lower surfaces; 
according to the writer’s observation there is preference for the up- 
