MASTIGOPHORA 



391 



these authors as a distinct species. It seems to be transmitted 

 by Glossina morsitans. 1 



Trypanosoma Avium. Trypanosomes were probably seen in 

 the blood of birds by earlier investigators, but the first accurate 

 description of such observations is that of Danilewsky in 1885. 



FIG. 159. Trypanosoma avium in culture on blood agar. X 1500. (After Novy 



and MacNeal.} 



Infection with trypanosomes is very common in the ordinary 

 wild birds. Novy and Mac Neal 2 examined 431 American birds 

 representing 40 common species and found trypanosomes in 38 

 individuals, representing 16 species. The indicated prevalence 



1 Kinghorn and Yorke: Annals of Trop. Med. and ParasitoL, 1912, Vol. VI, 

 pp. 269-285. Kinghorn, Yorke and Lloyd: ibid., 1912, Vol. VI, pp. 495-503. 

 2 Journ. Infect. Dis., 1905, Vol. II, pp. 256-308. 



