GENUS TRYPANOSOMA ' SENSl^ LATO' 



413 



1^ 



1 8-32 X I •75-4*25 microns, and having the flagellum always free. It is patho- 

 genic for equidae and ruminants only. 



Duttonella uniformis Bruce, Hamerton, Bateman, and Mackay, 191 1. 



Synonym. — Trypanosoma uniforme Bruce, Hamerton, Bateman, Mackie. 



It is very like T. cazalhoui, but smaller, and causes a very fatal disease in 

 cattle. It is a small active trypanosome 16X i •5-2*5 microns, with the free 

 part of the flagellum some 1-5 microns in length. There is no narrowing 

 opposite the trop ho nucleus. It is spread by Glossina palpalis, which becomes 

 infective in twenty-seven to thirty-seven days. The development is anterior, 

 being confined to the proboscis. 



Duttonella pecorum Bruce, Hamerton, Bateman, Mackie, 1910. 

 Synonym. — Trypanosoma pecorum. 



This term probably includes Trypanosoma dimorphon, T. congolense, and 

 T. confusum, Dr. Edington's Zanzibar trypanosome, the trypanosomes from 

 Chai-Chai and from Southern Rhodesia. 



It is found in cattle. It measures 80-18 0 microns, and is capable of 

 passing through a cycle of development in G. morsitans, which becomes 

 infective after twenty days. Development takes place like T. simics first in 

 the gut, then in the labial cavity, and finally in the hypopharynx, where it 

 becomes infective. 



Duttonella simise Bruce, Harvey, Hamerton, Davey, and Lady Bruce, 191 2. 



Synonym. — Trypanosoma ignotum Kinghorn and Yorke, 1902. 



It causes a rapidly fatal disease in monkeys and a chronic disease in goats. 

 It is abundantly present in Glossina morsitans in Nyassaland and North- 

 Eastern Rhodesia, It measures 14-24X1-2*75 microns, and is monomorphic. 

 Its natural host appears to be G. morsitans, and the monkey seems to be a 

 new host. The development is completed in the proboscis and hypopharynx. 



FORMS UNCLASSIFIABLE. 



Genus Trypanosoma sensil lato. 

 Group i : Part of the Flagellum always Free. 



They may be separated from one another according to the follow- 

 ing scheme, based upon the invertebrate host, the pathogenicity, 

 and the serum reactions : — 



A. No invertebrate host, spread directly from male to female 



by coitus : — 



Kinetonucleus near aflagellar end and easily seen. 

 Habitat Americdi—Hippicum. 



B . Invertebrate host not a Glossina : — 



I. Kinetonucleus very insignificant. Habitat, South 

 America — ■Equinum . 

 II. Kinetonucleus ordinary. Parasite monomorphic. 



Habitat, various. Animal immune to C. evansi 

 becomes infected with T. togolense and T. 

 soudanense. 



{a) Animal immune to T. togolense, infective by C. 



evansi and T. soudanense — Togolense. 

 (b) Animal immune to T. soudanense becomes infec- 

 tive by C . evansi and T. togolense — Soudanense. 



