140 INSECTS AFFECTING DOMESTIC ANIMALS. 
Family IN Yi@@EiEE TE pear 
(Bat Flies.) 
These very remarkable Diptera seem to have gone a step farther even’ 
; than the Hippoboscide in their adaptation to 
parasitic life, the known forms being totally wing- 
less and constantly confined to their hosts. The 
latter are various species of bats, and the species 
have been observed in various parts of the world, 
three only being recorded for this country, the 
Strebla vespertilionis Fab., credited to Jamaica, 
San Domingo, Cuba, and South America; the 
Megistopoda pilatei, from Cuba, and an unnamed 
species of Nycteribia, from California. 
The Strebla vespertilionis is credited with occur- 
ring on pigeons and parrots, but considering the 
normal habits of all the known species these 
must be looked upon as stragglers. 
Fic. 75.—Nycteribia sp. 
(after Packard). 
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