In 1961 face flies (Musca autumnalis De Geer) were not numerous on New Jersey cattle until in late June and early July, when they became increasingly more annoying, even in southern coastal areas where in 1960 they had been the least troublesome. Since in 1960 temporary relief had been obtained from some insecticides or insecticides plus baits or repellents, tests were continued with various formulations applied in liquid form with customary apparatus and also with specialized equipment such as a mechanic’s pump-oiler. In tests on the suitability of various dust applications, beginning with an extension of the laboratory studies of stabilized insecticide dusts, it was found that 1.0% or 2.0% stabilized DDVP markedly reduced face fly annoyance for 6 to 9 hours after application, while DDVP on pyrax was ineffective. DDVP as a combination of water-base spray (at 0.2.5%) applied to the bodies of the animals or a paint or liquid treatment (at 0.5%) on the faces was generally not so effective as the stabilized dust. A stabilized Ortho Dibrom® (1,2-dibromo-2,2-dichloroethyl dimethyl phosphate) dust (4%) and Dibrom spray (0.6%) provided 50% to 60% reduction for the day of application, but both formulations appeared to cause discomfort to the animals and to the persons who made the applications. When larger quantitites of water-base sprays, 1 pint per animal, were used, SD-4294(dimethy12-(alpha-methylbenzyloxycarbonyl)-1-methylvinyl phosphate) and Gen. Chemical 4072 (2-chloro-1-(2,4-dichlorophenyl) vinyl diethyl phosphate) (0.5%) provided 50% to 60% protection on the day following application, with the latter formulation being slightly superior to the Shell product. Other formulations tried in this way which provided up to 6 but not usually more than 6 hours protection were 1% Bayer 37344 spray (4-(methylthio)-3,5-xylyl methylcarbamate) and 0.12% Diazinon® (O,O-diethyl O-(2-isopropyl-4-methyl-6-pyri-midinyl) phosphorothioate). Some protection was also obtained on day of application from 1% dimethoate as a paint on the faces of the animals; 1% of 2,4 dimethyl benzyl chrysanthemumate spray; synergized pyrethrins as a pressure spray, and as an oil-base spray with Crag Fly Repellent® (butoxy polypropylene glycol) or MGK 1207 (3-chloropropyl n-octyl sulfoxide); and 2% Lethane 384®,(beta-butoxy-beta-thiocyanodiethyl ether) plus Crag Fly Repellent in oil. Starting with stock material obtained in the field, a small colony of face flies was successfully reared in the laboratory for four generations.