141 



<:learing of bush and endeavouring to reduce the numbers of the fly- 

 by systematic capture on a large scale. The district examined was 

 part of the proclaimed area near the western shore of Lake Nyasa 

 at Domira Bay. Observations have shown that there is no evidence 

 of the natural splitting of the northern portion of the fly area in the 

 dry feason into two small localised patches, though two large areas 

 do exist as a result of the subdivision of one larger one by native 

 clearings ; in the southern part-, examined after a few scanty rains, 

 the two so-called primary centres were continuous with each other 

 and with the northern part of the area. Fly is undoubtedly more 

 concentrated in Nyasaland in the dry season than in the wet, coincident 

 with the greater concentration of the game which then takes place. 

 The radiation which follows the scattering of the game after the dry 

 season is, in the author's opinion, too extensive to make practicable 

 any attempt at clearing and reducing the numbers of the fly by 

 systematic capture. Preliminary experiments have been conducted 

 to determine the range of flight of G. morsitans. Evidence has been 

 obtained of ten flights of five miles and of one flight of ten miles 

 back to the locahty from which the flies were originally taken. The 

 flies recaptured were all taken at the edge ol the fly area. Considerable 

 attention has been devoted to the fossorial wasps of the genus Bembex 

 as being possibly natural enemies or G. morsitans. Fhes of the family 

 BoMBYLiiDAE, somc Small species of which exist in great numbers in 

 the lingadzi district, have also been under consideration as potential 

 enemies. An endeavour to feed the flies on the larvae of a Saturniid 

 moth met with, negative results. A new fly area has recently been 

 reported in the Marimba district of Nyasaland ; this district possesses 

 for the most part a dry, sandy soil and is thinly populated. Tsetses 

 are especially attracted by moving objects, and several flies will often 

 travel on or near a person for considerable distances without attempting 

 to bite. An examination of such individuals showed that they were 

 all males. 



The Stegomyia Survey in Hong Kong. —Bull. Entom. Research, Loiidon, 

 vi, 1st June 1915, pp. 67-68. 



In view of the possible introduction of yellow fever into the Far 

 East, the Government of Hong Kong has instituted an investigation 

 of the mosquitos of the Colon}'. The following is a list of species. 

 found up to the present time: — Anopheles indiensis, Theo., 

 A. jeyporensis, Theo., A. karwari. James, A. macidatus, Theo., 

 A. ininimus, Theo., A. rossi, Theo., var. indefinitus, Ludl., A. sinensis, 

 Wiecl., A. tessellatus, Theo., Stegomyia fasciata, F., S. scutellaris, Wlk., 

 S. w-alba, Theo., Armigeres obturbans, Walk., Ochlerotatus macfarlanei, 

 Edw., 0. togoi, Theo., Cidiciomyia pallid at Jwr ax, Theo., Cvlex 

 bitaeniorhynchus, Giles, C. concolor, R. D., C. fatigans, Wied., 

 C. fuscocephalus, Theo., C. mimeticus, Noe, C. sinensis, Wied., 

 G. sitiens, Theo., C. tritaeniorhynchus, Giles, C. virgatipes, Edw., 

 C. vishmii, Theo., Ficalbia minima, Theo., LopJiocerafotm/ia minutissima, 

 Theo., L. riibithoracis, Leic, Mansonioides vniformis, Theo., Micraedes 

 malayi, Leic, and Uranotaenia macfarlanei, Edw. 



Stegomyia scutellaris is probably the commonest mosquito in Hong 

 Kong. During the summer it breeds abundantly in Chinese houses 



