1933 ] 
Notes on Hippoboscidae 
77 
quart, but claimed to be of a different species). Lutz, 
Neiva and da Costa Lima, 1915, Mem. Inst. Osw. Cruz, 
VII, p. 190. 
? Olfersia wolcotti Swenk, 1916, Jl. New York Ent. Soc., 
XXIV, p. 132 (no sex; off Buteo platypterus ; Ann Arbor, 
Michigan) . 
Specimens Examined.— Florida : St. Augustine, off a 
Screech Owl, Otus asio floridanus (Ridgway) (C. W. John- 
son) ; Miami (P. Laurent) —Colorado : one female without 
more definite locality (Ks. Univ. Ent. Mus.) .—California : 
several specimens off Burrowing Owl, Speotyto cunicularia 
hypogea Bonaparte, and off Californian Screech Owl, Otus 
asio mccalli (Cassin), without more definite locality (H. 
Edwards.- — M. C. Z.) ; San Jose, Santa Clara Co., off Great 
Horned Owl, Bubo virginianus pacificus Cassin, and off 
Barn Owl, Tyio alba tuidara J. E. Gray, three specimens 
(G. A. Allen).— Also several specimens, without localities, 
in the old Osten Sacken Collection at the M. C. Z. 
The specimens from Florida, here listed as L. fusca, were 
recorded by C. W. Johnson (in 1895, 1913, and 1922) as 
L. americana. As suggested above, most previous records 
of L. americana from California and Oregon were probably 
based on L. fusca. 
The differences between L . fusca and L. americana, men- 
tioned in my key, may seem trifling. Yet they appear to be 
constant and in the large series of both species studied I 
have seen no specimen of doubtful identity. A repeated 
and careful study of my material has failed to disclose other 
reliable characters. The following peculiarities may, how- 
ever, be of some value. (1) The frons is usually narrower 
in L. fusca than in L. americana, although the width seems 
to be variable in both species ; in most fusca it is less than 
one and a half times as wide as the eye ; in most americana 
it is one and a half times to twice as wide as the eye. (2) 
The apical, flaring arms of the fronto-clypeus appear to be 
less spreading in fusca than in americana . (3) The color of 
body and legs is as a rule more uniform and darker mahog- 
any brown in fusca, lighter and blotched in americana, 
while the wings of fusca lack the slight yellowish tinge of 
americana. 
