118 FEATHER-LICE INFESTING CHICKENS. 
sunlight could reach every nook and corner, all sorts of 
parasites would become scarce. 
FEATHER-LICE INFESTING CHICKENS. 
(Goniocotes hologaster Nitzsch). 
This very common and troublesome parasite, the female 
of which is shown in fig. 90 and the male in fig. 91, is only 
about 1mm. in length. It has a nearly square head; its ab- 

Fig. 90.—Biting-louse of the : Fig. 91.—Biting-louse of the 
chicken, female. Greatly enlarged. chicken, male. Greatly enlarged. 
Original. Original. 
domen is not very conspicuously marked, and the incurved 
margins of the segments do not extend very much upon the 
dorsal surface, as is the case in many other species, and 
which produce the very distinct lines and borders seen there. 
Goniocotes abdominalis Piaget. 
This very conspicuous parasite is also fairly common 
and decidedly troublesome. It is much larger, measuring 
about 3mm. in length. The head is almost circular in 
front, constricted behind; the thorax is small. Head, 
thorax and legs are yellowish, marked with dark margins 
and spots. The segments of the abdomen are marked 
with white fasciz with black borders, as shown in the 
illustration, fig. 92. 
