162 THE BLUE-BOTTLE-FLY. 
TSE-FLY ((rlossina morsitans), which is said to be so danger- 
ous that whole regions in Africa are uninhabitable during 
the season in which they are numerous. The mortality 
caused by them is no doubt due to a disease disseminated by 
their attacks. Bruce, in his travels to discover the source of 
the Nile, in 1790 first figured this insect, and a copy of it is 
shown in fig. 134, while a more modern one is also given 
rochesett 
He gives in the books published by hima very interesting 
account ofits mode of life, and a still more interesting his- 
torical sketch of the changes produced by it in the political 
history of the countries in which it abounds. 
THE BLUE-BOTTLE-FLY. 
( Calliphora vomitoria Linn.). 
This beautiful fly, beautiful in colors but not in manners, 
is known to everybody. It can not be classed as a parasite, 
or as infesting man and beast. It is very frequently found 
in our houses, usually trying to run its head through the 
glass of our windows, and as constantly complaining about 
the hardness of the latter by a deep humming sound. But 
when we ask those in charge of our eatables they will com- 
plain bitterly about this insect which loves meat of all kinds 
and is very apt to spoil the same in more than one way. It 
is shown in fig. 135, plate XII. 
THE HORN-FLY. 
(Hematobia serrata R. Desv.). 
This insect is a recent acquisition, and one we could well 
do without. It reached this side of the Atlantic coast, ac- 
cording to Prof. John B. Smith, the well-known entomolo- 
gist of New Jersey, either in 1886 or in 1887, and soon 
spread westward. In 1892 the writer noticed it in large 
numbers in Otter Tail County, and was told that it had 
there troubled cattle for some years. Mr. L. A. Foote, of 
Worthington, Minn., a very careful observer, told me very 
late in the fall of 1895, that it had been common in that 
vicinity long before 1886, and to demonstrate that he knew 
