Annals of tropical medicine and parasitology . have withstood thedisease so far will be safe until the rains recommence. The dryseason is also the time of year selected by the herdsmen of the northto undertake their long trek south with their cattle and sheep. The province of Ilorin in Northern Nigeria is peculiar, inasmuchas, whilst G. palpalis and G. tachinoides are distributed all over it,tsetse flies of the morsitans group—G. submorsitans and G. longi-palpis—are restricted to one, the Patigi or eastern, division. In 8 my series of cases of trypanosomiasis collected at Ilorin, twenty-four w
Annals of tropical medicine and parasitology . have withstood thedisease so far will be safe until the rains recommence. The dryseason is also the time of year selected by the herdsmen of the northto undertake their long trek south with their cattle and sheep. The province of Ilorin in Northern Nigeria is peculiar, inasmuchas, whilst G. palpalis and G. tachinoides are distributed all over it,tsetse flies of the morsitans group—G. submorsitans and G. longi-palpis—are restricted to one, the Patigi or eastern, division. In 8 my series of cases of trypanosomiasis collected at Ilorin, twenty-four were animals that had never been into the Patigi division, andof these fourteen were infected with T. vivax, six with T. bruceiand four with T. namnn or pecorum. The Patigi division isshunned by all herdsmen, and it is generally recognised that horsescan neither live there nor be taken into the district withoutcontracting tsetse disease. Two horses that had lived for years inIlorin town were taken to Patigi during my last tour of Chart showing the rainfall in inches (continuous line) and the number of cases oftrypanosomiasis of horses admitted to the isolation camp (dotted line) at Zungeruduring 1911. Both returned infected with T. brucei, and both died shortly afterwards. In this connexion it should be mentioned that Bruceconcludes that, in Uganda, The carrier of Trypanosoma vivax isprobably Glossina palpalis and that G. morsitans is known totransmit T. brucei. It is possible that in the native towns andEuropean stations flies of the genus Stonioxys, which abound inthese places, may play a part in the transmission of trypano-somiasis. The horse (No. 42), for instance, had not been within two miles of any spot known to be haunted by tsetse flies for fiveweeks previous to the onset of his symptoms, and it is practicallycertain that during this period he could not have been bitten bytsetse flies. He was, however, tormented by Stovioxys flies, whichwere exceedingly co
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