25 



troublesome on the large rivers and near the coast. The species of the 

 genus Janthinosoma are essentially field mosquitos, and at times occur 

 in large swarms in the cacao estates and in the woods. They are 

 voracious blood-suckers, and lately J. liitzii has been found by Dr. 

 Nunez Tova to be the carrier of the eggs of Dennatobia (mosquito 

 worm) to man and animals. Aedes scapularis and A. serratus are com- 

 mon in the woods and cacao plantations ; the former can be recognised 

 by the white silvery spot on the thorax, and the latter by the single 

 silvery line on the back of the thorax. A. taeniorhynchus is a black 

 mosquito, which is often very numerous and troublesome. Aedes 

 sexlineata is common in the cacao plantations and in woods, but its 

 larvae have never been found, being probably tree-hole dwellers. The 

 genus Haemagogus is represented by the metallic green and blue 

 mosquitos that attack man in the woods and among cacao. 

 Deinocerites troglodytus is a crab-hole mosquito, living near the crab- 

 holes in the water of which its larvae dwell. The author's experience 

 is that it is a timid blood-sucker, biting in the field. The Sabethinae 

 are all bromelia or tree-hole dwellers. The species of ]Vyeo)Jii/>a bite 

 in the field, and in flight carry their legs all curled up. Also a biter in 

 the field is Sabetkinus, a genus of metallic blue colour. JobJolui 

 digitatus is a fairly large mosquito with white tarsi seen around cacao 

 heaps, in the broken shells of which it breeds when they contain water. 

 The list of mosquitos is followed by a summary of the remedial measures 

 that should be taken against them. 



Macfie (Dr. J. W. S.). Preliminary Note on the Development of a 

 Human Trypanosome in the Gut of Sioitwxgs nigra. — A»n. Trop. 

 Med. Parasit., Liverpool, Series T.M., vii, no. 33. 7th Nov. 1913, 

 pp. 359-362, 1 fig. 



The role of Stomoxys in the transmission of trypanosomiasis has been 

 much discussed. In May 1913, the author made some experiments 

 on the subject at the Medical Research Institute, Lagos. At the end 

 of May and at the beginning of June a number of S. nigra caught in the 

 laboratory were fed on a guinea-pig infected with the trypanosome 

 from a case of sleeping sickness from Eket in Southern Nigeria. This 

 trypanosome differed in several respects from T. gaiitbiense. Thirteen 

 flies w^ere dissected from one to six days after the first infecting feed. 

 In six, flagellates [Herpetomonas) were found in the mid-gut. As a 

 control, twelve flies not fed on the infected animal were dissected and 

 found to have no flagellates. To exclude the possibility of previous 

 infection, experiments were begun with flies bred in the laboratory. 

 On 14th June one S. nigra, which had emerged the previous day, was 

 fed on the infected guinea-pig. On 17th June, the fly was dissected 

 and Herpetomonas was found in the mid-gut only. On 28th June, 

 another bred fly was fed on the infected guinea-pig. It was dissected 

 on 2nd July, and Herpetomonas found in its mid-gut. Two flies also 

 bred out in the laboratory, but not fed on the infected guinea-pig, were 

 dissected and found to contain no flagellates. These experiments 

 would seem to prove that the trypanosome, with which the guinea- 

 pig was infected, was capable of development in the gut of Stoinoxys 

 nigra, and thus this fly is probably capable of serving as the inter- 



