322 INSECTA. 
Hipproposca, proper. 
Furnished with wings; very distinct eyes occupying all the sides 
of the head; antennz in the form of tubercles, with three sete on the 
back. 
H. equina, L.3; De Geer, Insect., VI, xvi, 1—20. Brown mixed 
with yellowish. Found on Horses and Oxen, usually under their 
tail and near the anus(1). 
OrniTHOMYIA, Lat. 
Only differing from Hippobosca in the antenne which project, 
are laminiform and pilose; and in the wings which are furnished 
posteriorly with strongly marked longitudinal nervures that extend 
to the posterior margin. 
These Insects, in the Monograph of the Diptera published by 
Dr Leach, form four genera. 1. Feronta—Mirmomyia, Nitzsch— 
distinguished from the following ones by the tubercular form of the 
antennz, and by the nails of the tarsi having but two teeth in lieu 
of three. 2. Ornrruomyia, in which, as in the three following subge- 
nera, there are ocelli and tridentated nails, and, as in the two which 
succeed, laminiform antenne, but where the wings are almost 
equally wide and rounded. 3. Srenepreryx, similar to Feronia, 
with the exception of the wings which are narrow and very acute. 
4. OxypreruM, where the wings are equally acute; but the antennz 
are dentiform, the eyes are small, and ‘the ocelli are wanting as in 
Hippohosca and Feronia. 
They live on various birds, such as the Swallows, Titmouse, and 
even on the Vulture. 
O. verte; Hippobosca avicularia, L.; De Geer, Insect., VI, 
xvi, 21—24. Green; top of the thorax black; proboscis pro- 
jectings wings almostoval. On the Sparrow, &c.(2) 
(1) See Lat., Gen. Crust. et Insect., IV, p. 362; Leach, Dufour, &c. 
(2) Lat., Ibid.; Encyc. Méthod., article Ornithomyie, Leach. The eyes of the 
Ornithomyiz appear to me to be somewhat smaller than in Hippobosca. The 
sides of the thorax terminate anteriorly in a point. The sucker originates from a 
little piece emarginated like a heart, which is not exposed in Hippobosca. 
