THE 
SWALLOW HIPPOBOSCA. 
Generic Character. 
Mouth confining of a (hort, (trait, cylindric, 
bivalve fucker or tube, with equal valves. 
Antennce filiform. 
Feet furnilhed with feveral claws. 
Specific Character, &c. 
HIPPOBOSCA with fharp wings and fix-clawed 
feet. 
The (harp-winged HIPPOBOSCA. 
The SWALLOW-FLY. 
The genus Hippobofca differs remarkably from 
all other infeCts of the dipterous tribe, and feems to 
form as it were a (hade or connecting link between 
the orders Diptera and Aptera ; one fpecies, the H. 
ovina, (commonly termed the (heep-tick) being en¬ 
tirely deftitute of wings. The Hippobofcte alfo re- 
femble mod of the apterous infeCts in their mode 
of production; the ovum, (which is of uncommon 
fize) enclofing the infeCt completely formed ; fo 
that, as Linnseus obferves, it feems rather a purpa 
or 
