CLASSIFICATION 347 



B. Flagellates with both a vertebrate and an invertebrate host. 



Infection is contaminative or inoculative. No cysts occur. 



(a) Flagellates in which the highest development is the lepto- 



monas type. Infection of the vertebrate is either inocu- 

 lative or contaminative. {Leishmania.) 



(b) Flagellates in which the highest development is the try- 



panosome type. (Trypanosoma.) 



1, Trypanosomes which in the invertebrate develop in 



the posterior station. Infection of the verte- 

 brate is contaminative. 



(a) T. lewisi and other similar forms in small mammals. 



(6) T. cruzi. 



(c) Non-pathogenic trypanosomes transmitted by 



keds, species of Tabanus, or other biting flies. 

 T. melophagium, T. theileri, T. ingens. 



(d) Trypanosomes of birds (?). 



(e) Trypanosomes of land reptiles (?). 



2. Trypanosomes which in the invertebrate develop in 



the anterior station. Infection of the verte- 

 brate is inoculative, 

 (a) Trypanosomes transmitted by blood - sucking 

 arthropoda. 



(1) Pathogenic trypanosomes transmitted by 



species of Glossina. 

 (a) Development in the stomach, probos- 

 cis, and salivary glands. T. gam- 

 biense, T. brucei {T. rhodesiense). 

 (6) Development in the stomach and 

 proboscis. T. congolense, T. 

 simice. 

 (c) Development in the proboscis only. 

 T. vivax, T. uniforme, T. caprce. 



(2) Pathogenic trypanosomes transmitted by 



species of Tabamis or alHed flies, and 

 possibly by ticks. T. evansi, T. equinum. 



(3) Trypanosomes of birds (i). 



(4) Trypanosomes of land reptiles (?). 

 (6) Trypanosomes transmitted by leeches. 



(1) Trypanosomes of aquatic reptiles. 



(2) Trypanosomes of amphibia. 



(3) Trypanosomes of fish. 



C. Pathogenic trypanosomes usually passing directly from vertebrate 



to vertebrate (T. equiperdum). (As these have undoubtedly 

 become secondarily adapted to this mode of transmission, it might 

 be more logical to group them with the pathogenic forms trans- 

 mitted by Jbiting flies.) 



D. Flagellates with both an invertebrate and a plant host {Phyto- 



monas). P. davidi and similar forms. 



