343 
Cazalbou had previously noted their susceptibility to the trypaiiu- 
jomeofLaSoumaya. 
It IS most certainly to be regretted that '1. vivax has not been 
placed on a more substantial footing ; but the evidence that is before 
JS indicates stronRly that it has few if any aff.mtics with either the 
.vmii or dhmrfhon {(roiiii, and wc are unable to sec wherein 
r malboui differs in anv inanner from what has been made known 
regarding T. vh ax, and as further indicating the resemblance between 
these two, it may be added that Tabanidae are blamed by the German 
uritei for transmitting his species in the Cameroons, and Cazalbou on 
more than one occasion lately has emphasised his btlie t at t ns 
family is concerned in the dissemination of La Soumaya in t ’e g 
regions. . . 
Though they have never received specific designations, two otier 
irjpanosomiases of cattle deserve mention in connection with this 
group; that of Bruce, Nabarro and Greig at Entebbe, an^ la 
desaibed from Erythrea by Memmo, Martoglio and A am. 
each instance the respective observers have noted the insuscej^i i y 
of laboratory animals to infection. Tlie following paragrap 
up the morphology of the Erythrcan organism : The trypanoso 
is morphologically like T. brucei or T. evarisi, but is .. 
24^1 long; free flagellum, which is fairly long, inc u e . ^ 
extremely motile, like 7 . vivax of Zicmann. This 
appears to be very virulent for ruminants, and thus 1 
typical surra. In many respects it resembles the disease es 
by Cazalbou in French Sudan under the name Souma. ere is 
tsetse in the infected area, and the suspected fly is a 
^ippobosca' f V, 1 te 
It appears to us that these two species are incapable o 
diagnosis, save, perhaps, after a rigorous critical compan 
to us in Africa is impossible, and we have consequent y as 
second cattle trypanosome with the senior member. 
fctBroden' has also been struck by the unusual s.mdarity 
r.caxaUcui and T. vivax, which he considers he has obtarned rn 
Congo. 
^bole, North Eastern Rhodesia, 
October ^ih, igu8. 
