2l6 



ANIMAL PARASITES 



tsetse-fly, glossinia morsitans. It can be grown on blood agar 

 (Novy). 



Trypanosoma evansi causes surra, a disease of horses in Central 

 Asia. 



Trypanosoma equiperdum causes a sexual disease in stallions 

 and mares called dourine ; this is akin to syphilis in man. 



Trypanosoma lewisi of rats is transmitted from animal to 

 animal by means of fleas. 



FIG. 78. Typanosome in rats' blood. (Williams.) 



Trypanosoma noctuae. A parasite of the little owl, which is 

 introduced into the bird through the bite of the mosquito Culex 

 pipiens. 



Trypanosomes are elongated fusiform bodies pointed at both 

 ends, provided by a fin fold, or undulating membrane, running 

 along the dorsal edge and forming frill-like folds which terminate 

 in a whip-like extremity or flagellum. 



