304 
Psyche 
[December 
broad, flattened “heel” of the base. Wing’s always well 
developed and functional throughout adult life ; six distinct 
longitudinal veins and a vestigial seventh vein between the 
fifth (M 3 + Cui) and sixth (An) ; two cross-veins, the an- 
terior (r-m) and the anterior basal (m-cu or M 3 ) ; second 
basal cell very long; no closed anal cell; membrane bare, 
but rilled with numerous delicate, more or less parallel 
wrinkles, extending from the region of distinct veins 
toward the hind margin. 
The subfamily contains only one genus. 
Hippobosca Linnseus 
Hippobosca Linnseus, 1758, “Syst. Nat.,” 10th Ed., I, p. 607 
(type: Hippobosca equina Linnseus, 1758, designated 
by Latreille, 1810, Consider. Gener. Crust. Arachn. 
Ins., pp. 407 and 444). 
Hippobosca subgenus Nirmomyia Nitzsch, 1818, in Germans 
Mag. d. Entom., Ill, p. 309 (monotypic for Hippobosca 
equina Linnseus, 1758). 
Zoomyia Bigot, 1885, Ann. Soc. Ent. France, (6) V, pp. 
227 and 234 (tentatively proposed as a substitute for 
Hippobosca; type by present designation: Hippobosca 
equina Linnseus, 1758). 
Attention may be called to the remarkable structure of 
the pulvilli and empodium, which in this genus offer excel- 
lent specific characters. 
The genus Hippobosca is indigenous throughout the con- 
tinental areas of the Old World. All of the eight species, 
which I recognize as valid, are found in Africa; four of 
them extend also into the Oriental Region and two have 
entered Europe. Much of the present distribution of H. 
equina, H. camelina, H. maculata, and H. capensis is un- 
doubtedly artificial and due to the spreading of their domes- 
tic hosts by man. I have tried to trace the probable original 
home of these species, but the conclusions I have reached 
