70 INSECTS AFFECTING DOMESTIC ANIMALS. 
. 
It is said to be very troublesome in the wooded regions of the Mis- 
sissippi Valley, directing its attacks particularly upon horses’ ears, in 
consequence of which it is commonly called the 
‘‘ear-fly.” 
Chrysops univittatus Macq. 
This is a common species in the prairie region and 
is recorded from District of Columbia, Maryland, 
Connecticut, New Jersey, and Kentucky by Osten 
Sacken. It appears to be the most common species 
at Ames, Iowa. 
Chrysops niger Macq. 
A similar species, black in color; also very com- 
mon. 
Chrysops quadrivittatus Say. 
Say described this species in 1822 as inhabiting 
the region near the Rocky Mountains. It is of a 
gray color, with four iongitudinal brown lines on the 
thorax. The wings have a large brown spot on the 
front margin. It is nearly two-fifths of an inch in 
length. 
Chrysops costatus Fab. 
Fic. 33.—Chrysops vit : : ; 
tatus: larva (after Occurs in South America and the West Indies. 
Hart). 
Chrysops fugax O.S. 
This species, easily recognized from the figure, is widely distributed. 
Osten Sacken recorded it from Maine, New Hampshire, Canada, Idaho, 
Fic. 34.—Chrysops univittatus (original, from drawing by Miss L. Sullivan). 
Montana, and Yukon River. It occurs at Ames, Iowa, and doubtless 
throughout the northern Mississippi Valley at least. 
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