44 



FIG. 7. Organisms Of Sleeping Sickness (Trypanosoma gambiense), 



and red blood corpuscles. (Highly magnified.) 



With permission, from " British Museum (Natural History) Special 



Guide No. 7." 



What Disease is caused by Trypanosoma Cruzi, and how 

 is it conveyed ? 



The fatal disease, Barbeiro, in Man (especially children) 

 in South America (Brazil). The parasite is conveyed by 

 a bug ( Conorhinus, syn. Lamus megistus), which is found 

 in the houses of the poorer people. It attacks at night, 

 biting the face. 



Name some Trypanosomes which are of importance in 

 relation to Domesticated Animals. State which 

 diseases they cause, and how they are spread. 



Trypanosoma brucei is the cause of the deadly disease 

 Nagana in horses, cattle, etc., in Africa. It is spread by 

 Glossina morsitans, one of the tsetse flies. 



T. equinum causes "mal de caderas" of horses in South 

 America (Paraguay, Argentine, and other parts). The mode 

 of transmission is not known. 



