196 
HERBERT OSBORN. 
LICE AFFECTING DOMESTIC ANIMALS,* 
By Herbert Osborn. 
The following pages on some parasites that affect our 
domestic animals are extracted with but slight alteration from 
the writer’s paperf published by the Division of Entomology 
U. S. Dept, of Agriculture, and we desire here to acknowledge 
the kindness of the Department officers in allowing the use of! 
the cuts which accompany it. 
It is needless to speak of the importance of the subject or 
to present any apology for devoting space to its consideration, 
The keeping of live stock for work, dairy, and meat or wool 
production is one of the most important industries in the state 
and the injuries of parasitic insects often assume important 
proportions. While only a few species are treated in the 
present paper they are such as require irequent attention. 
The common lice of our domestic animals belong to twc| 
quite distinct groups of insects, and may be called for con 
venience the suctorial lice (which form the family Pediculidae 
and the biting or running lice, which do not penetrate the 
skin to suck blood, but feed upon the epidermal scales, hairs 
feathers, etc. (which are included in the family Mallophagidae) 1 
The Suctorial Lice. 
In these there is a tubular mouth capable of being thrusi 
into the skin to draw blood. The feet are adapted to clasping 
hairs and the insects are poorly adapted for locomotion excep' 
in the hairy covering of animals. 
The eggs, “ nits,” are attached to hairs by a glue-like sub 
stance, and the young lice when hatched resemble the adult: 
except in size. As the entire life of the parasite is passec 
upon the same animal or another animal of the same kind, it: 
range of habit is easily stated. 
* * 
*From Bulletin of Experimental Station of Iowa. 
+ 1 . The Pediculi and Mallophaga affecting Man and the Lower Animals, b 
Prof. Herbert Osborn. Bulletin 7, Division of Entomology, U. S. Department 0 
Agriculture, 1891. 
