LICE AFFECTING DOMESTIC ANIMALS. 
269 
/hich it is now placed, the species was again described by 
litzsch (Germar’s Magazine, 3, 296) under the name of Tri- 
hcdectes scalaris, and it has been known by this name in all 
f the numerous writings subsequent to this description. It 
as been treated by all writers upon the parasites of animals 
nd is one of the best known species of parasitic insects. The 
fleets upon the cattle infested are often quite serious on ac- 
3unt of their great number, but they are apparently less in- 
lrious than the suctorial species which infest cattle. This 
'jury depends, of course, upon the numbers occurring upon 
le individual, and somewhat upon the irritability of the ani- 
lal infested. This species much resembles the form occur- 
ng upon horses, but is somewhat shorter and the abdomen 
pers less towards the extremity ; the dark bands across the 
idomen are also more distinct. They are generally found 
greatest abundance in the spring of the year, at which time 
1 ults and eggs are discovered in great numbers. Their de- 
dopment corresponds with the other species, and they are 
ibject to the same methods of attack. 
They are very distinct from the suctorial species in ap- 
iarance, and this difference is recognized by practical men, 
ho speak of them as the “ little red lice,” as contrasted with 
e “ blue lice,” and they recognize, too, the difference in the 
auble caused by the two species. 
The application of kerosene emulsion or of tobacco decoc- 
)n at seasons when this is practicable is effective, and we 
ve found the process of fumigation described under suck¬ 
le ox-louse to be effective, and this, of course, is applicable 
all seasons of the year, even in cold weather, without dan- 
;r to the animal. 
The Louse of the Sheep. (Plate II., Fig. 9). 
Trichodectes speerocephalns , Nitzsch. 
Redi is credited with the recognition of this species, and 
lowing him Linnaeus described it under the name of Pedi- 
J -us ovis, and later still it was described in detail under the 
me given above. Denny’s reference to it would indicate it 
rare in England, and we have not met it here, though we 
