. Bulletin. not uncommon oncattle in England, but is believed to be harmless as stated by Mr. Verrall, in the Entomologists Monthly Magazine, Vol. 29, , 1893. The first report of its occurrence in this country, so far as I amable to learn, was by Dr. S. W. Williston in the Entomologica Amer-icana, Vol. 5, p. 181, 1889, where he states that the first specimensof this remarkable fly were sent to him by Prof. Cope, through , nearly two years previous, or in 1887. In 1888, it wasreported in New Jersey, Pennsylvania, Delaware, Maryland andWest Virginia ; in 1891, in Massachus
. Bulletin. not uncommon oncattle in England, but is believed to be harmless as stated by Mr. Verrall, in the Entomologists Monthly Magazine, Vol. 29, , 1893. The first report of its occurrence in this country, so far as I amable to learn, was by Dr. S. W. Williston in the Entomologica Amer-icana, Vol. 5, p. 181, 1889, where he states that the first specimensof this remarkable fly were sent to him by Prof. Cope, through , nearly two years previous, or in 1887. In 1888, it wasreported in New Jersey, Pennsylvania, Delaware, Maryland andWest Virginia ; in 1891, in Massachusetts, Mississippi and Kentucky ;in 1892, in Michigan, Canada, Louisiana and Iowa, and it is nowpretty well distributed over the United States. 12 COMMON NAMES. This insect lias been called the Horn Fly because of its habit ofresting on the horns of the cattle. Other common nanies are theCattle Horn Fly, the Cow Horn Fly. the Texas Fly, the Buffalo Fly,and the Buffalo Gnat. POPUI>AR DESCRIPTION OF THE FiGURK 1.—a, egg; b, imago; c, head from the side; d, mouth parts. All greatlyeulargeil. (After Smith.) This fly (Fig. 1. b) resembles the common house fly in generalappearance, but is much smaller, being about one-third of an inchlong. It is of a dark gray color with a yellowish sheen, and thebody is covered with minute black bristles. The head consistsalmost entirely of the dark-red, silvery-edged eyes, but bears on itslower surface the black dagger-shaped tongue which is the cause ofso much torture to cattle. LIFE HISTORY OF THE INSECT. The female deposits iier eggs (Fig. 1, a) singly on fresh cowmanure, usually during the warm part of the day. The eggs areabout one-twentieth of an inch long and of a brownish color. Theyhatch in about 24 hours and the young maggots burrow down into thedung where they feed, and reach their full growth in about a week,when thev are of the form shown in Fig. 2, 1. Thev then descend 13 into the grouud where they change to the pupal stage
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