42 PARASITOLOGY. 
The Pigeon Louse—Lriprurus Bacutus. This 
is a long, slender, light colored louse with mouth 
parts arranged for biting, and its legs are provided 
with hooklets which aid it in holding to the feathers. 
It is illustrated in Fig. 15. 
Goniocotes Hotocaster—This is still another 
louse that sometimes infests chickens. In many 
respects it resembles the louse of the turkey, but 
it is a distinct species. It is illustrated in Fig. 14. 
Like the others, its mouth parts are arranged for 
biting. 
Life History —The females are slightly larger than 
the males. The females lay oval, white, or whitish- 
yellow eggs (nits) and securely cement them to the 
barbs of the feathers. This is illustrated in Fig. 12. 
The lice hatch in from ten days to two weeks in warm 
weather, by breaking open the ends of the eggs. The 
young have much the same shape as the adults, but 
are usually lighter in color. The males are usually 
less numerous than the females. 
Conditions Produced.—Chicks hatched in the in- 
cubator are free from lice and stay free until placed 
with lousy hens or chicks, or in lousy quarters. Lice 
produce much irritation. The effect of large numbers 
upon chickens is quite marked. The hens scratch and 
pick at the feathers, show signs of being drowsy, may 
refuse to eat, and in growing birds, body development 
is interfered with. Young chicks often sit around, 
moping, with wings hanging down, and finally in a 
week or two may die. For this reason, brooder chicks 
thrive better, grow faster, and are free from many 
ailments than chicks hatched by the hen. It has been 
said that a lousy bird will have more of a tendency to 
