PARASITOLOGY. 



45 



the whitewash. The litter and straw should be 

 removed from the nests and burned, and the nests 

 should be disinfected and new straw provided. Be- 

 fore re'filling with straw, an inch of slaked lime should 

 be placed in the bottom. 



Fig. 14. 



Fig. 15. 



Fig. 



Fig. 14. — Goniocotes hologaster, a louse (from a hen), ventral 

 view; a, mouth parts: b, antennae; c, booklets on free extremity 

 of leg. The small mark to the right indicates the natural size. 



Fig. 15. — Lipeunis baculus, from the pigeon. Letters indicate 

 same parts as in Fig. 14. 



Fig. 16. — Sarooptes mutans, variety g:allinae, the scab parasite 

 producing scaly legs in the hen. a, the mouth parts with which it 

 wounds the skin and causes serum to exude; b, the short legs; c, 

 the small dot indicates its natural size. 



ARACHNIDA. 



The parasites belonging to this class are not in- 

 sects, — the head, thorax and abdomen are not dis- 

 tinct, and the head is not provided with antennae. 



ACARINA. 



Under this order we study the following families, 

 and sub-families, viz: 



