2G 



Jack (K. W.)- Tsetse Fly Investigations, Sebungwe, August-September 

 (^/v 1916. — British South Africa Company Keport received from 



Vy Colonial Office, 27th November 1916, 3 pp. 



As a result of investigations, it has been found that the tsetse-fly 

 [Glossina mwsitans] continues to spread rapidly in certain parts of the 

 ' iSebungwe district, Southern Khodesia. In the south-west corner of 

 the big belt, the fly has advanced in a southerly direction from the 

 Mzola to the Kana River, and in a westerly direction to the Shangani 

 River. At the head-waters of the Mzola River, although no actual 

 advance is recorded, the fly is certainly increasing rapidly. An 

 advance of seven or eight miles has been made up the Sengwe River 

 since 1914. It is reported to have also spread northward near the 

 Sengwe and Sasame Rivers. At other points visited no advance is 

 apparent since 1914. In some of the cases mentioned, the spread of 

 the fly is believed to have been due to the movements of game. 



With regard to an outbreak of trypanosomiasis on Meare's Farm, 

 Sikombella River, the proof is considered practically established that 

 trypanosomes of the T. jiecortim type are capable of being transmitted 

 under natural conditions from an infected to a healthy ox by some 

 agency apart from a tsetse-fly. The facts are given in detail. 



The author also discusses the possibility of isolating Sipani Vlei,. 

 in order to carry out experiments as to the result of excluding game 

 from a fly area which is isolated during the latter half of the dry season, 

 thus obtaining valuable information on the relation of big game to- 

 tsetse-fly. 



SwELLENGREBEL (N. H.). Quelqucs Notes sur la Distribution geogra- 

 phiques des Anophelines et du Paludisme, a Sumatra. [Some Notes 

 on the Geographical Distribution of Anophelines and Malaria in 

 Sumatra.] — Aym. Inst. Pasteur, Paris, xxx. no. 11, November 

 1916, pp. 593-599. 



On comparing the lists of Anopheliiies as found by the author and 

 Schiifiner in the plain of Deli and that given by Strickland for 

 Malacca, they are found to be identical except that the latter includes 

 Anopheles {Neostethopheles) aitkeni, A. {Nyssorhynchis)fuliginosus, and 

 A. {N.) karwari, which are lacking in the first list, and A. (N.) macidatus, 

 which has since been found on the plateau of Batak, Central Sumatra. 

 According to Watson, the most important carriers of malaria in Malacca, 

 are A. {Patagiamyia) umbrosus, which is rarely found at Deli, and 

 species of Nyssorhynchus which are not present there. It seems there- 

 fore probable that the small incidence of malaria at Deh is due to the 

 rarity or absence of these mosquitos. Where malaria is present, 

 especially on the coast, the Anophelines found are A. {Nyssomy- 

 zomyia) rossi and A. (N.) ludlowi, the latter being a proved transmitter 

 of malaria, though less dangerous than A. umbrosus. In the interior 

 of the Deh district, near the town of Medan, A. {Myzorhynchus) 

 sinensis abounds, and although this is a transmitter of tertiary fever 

 and despite the presence of breeding grounds of Anophelines, malaria 

 is rare among Europeans in this town. There are outbreaks from 

 time to time on the plantations, especially on one where A. {Neoniy- 

 zomyia) leucosphyrus was abundant. This mosquito is of recent 

 importation and was the only Anopheline found on this plantation. 



