7 8 Mites Injurious to Domestic Animdls. 



Continent ; they are said to be very injurious to young chickens 

 in the United States, sometimes causing death when present in large 

 numbers. Two of the forms occurring on American poultry are 

 figured in^this pamphlet (figs. 44 and 45). 



Another larval Trombidiid mite (Leptus (Microtrombidium?) 

 guineense, Bruyant and Joyeux, 1913) occurs on poultry and 

 monkeys at Kouroussa on the Niger in Upper French Guinea. 



FIG. 66. 



Liponyssus bursa (p. 89). A fowl mite with a wide distribution in 



the warmer regions of the world. Dorsal view of female, x 100. 



(After Hirst, Bull. Ent. Res. 1915.) 



SUB-ORDER VEKMIFOKMIA. 

 FAMILY DEMODICIDAE. 



These mites are allied to the Cheyletinae (Prostigmata), espe- 

 cially to the genus Psorergates, Tyrrell, the species of which, like 



