Report of the State Entomologist. 319 



The Ox Warble-fly. (Country Gentleman, for June 23, 1887, lii, 

 p. 493, c. 1-3 — 106 cm.) 



What warbles are; different species of warble-flies ; flgure and descrip- 

 tion of the ox warble-fly and its life-history ; habits of the larva and 

 flgures. The best method of dealing with this insect is to kill the mag- 

 got in March and April by applying to the opening in the warble a 

 little mercurial ointment. Eef^'ence to the old method of for- 

 cing out. The ointment sometimes applied before openings appear. 

 Other thick adhesive material that may be applied to arrest respiration. 

 Natural history of the insect. Applications for prevention need to be 

 long continued, and are, therefore, not as simple as killing. Some pre- 

 ventives named. Eeference to, and figure of, the ox gad-fly, Tabanus 

 bovinus Linn. 



Grape-vine Leaf-hopper. (Country Gentleman, for June 23, 1887, lii, 

 p. 493, c. 4 — 33 cm.) 



Insects destroying grapevines in Clearfield, Pa., are not " thrips " as 

 commonly named, but species of Erijthroneura, of the Hemiptera ; the 

 general appearance and operations of these leaf -hoppers ; a common 

 one is the Tettigonia vitis of Harris, which is described. The young 

 leaf-hopper may be killed with soapsuds, or tobacco water, or the 

 kerosene emulsion. When winged, they may be driven on a piece of 

 building-paper coated with gas-tar stretched between the rows of the 

 vineyard. 



The Rose-Bug. (Country Gentleman, for June 30, 1887, lii, p. 511, 

 c. 1-2 — 35 cm.) 



Eose-bugs from Onondaga county, N. Y., and Cumberland county, 

 N. J., attacking peach, corn, grape, and blackberry are identified. No 

 means for fully controlling it yet known ; is a local insect, and believed 

 to breed in sandy soil. Beating and jarring from plants and trees has 

 long been practiced successfully. When on corn might be poisoned 

 with Paris green or London purple. Dusting the foliage with some dry 

 powdery substance is a good preventive. Lures for concentrating 

 attack are the Clinton grapevine and valerian. Account of the success 

 of the last-named lure. 



The Hop-Louse. (Country Gentleman, for June 30, 1887, lii, p. 511, 

 c. 2-3 — 23 cm.) 



In answer to request for remedies for Phorodon humuli, reply is 

 made that none will probably be needed this year. In years of its 

 abundance, the English custom of hop-washing will have to be adopted 

 in this country, to insure remunerative crops. The machine used in 

 England for this purpose is described, and the wash of quassia extract, 

 soft-soap and water given. Eeference made to present investigations 

 in the life-history of this insect by the Division of Entomology at 

 Washington. 



