﻿74 DE. A. INGEAM --NOTES ON THE MOSQUITOS OBSEEVED 



larvae collected from these samples were bred out after separating the species, so 

 far as possible. Many of the larvae were easy to rear, so long as they were given 

 fresh water from their native pool frequently, and care was taken to remove 

 the larvae of other aquatic insects, such as dragon-flies, which prey upon them. 

 Other larvae did not thrive so well ; for example, quite two-thirds of the 

 Myzorhynchus larvae died after living several days in the breeding vessels without 

 appearing to grow at all. 



The station at Bole is distant about 600 yards north of the town and some 

 500 yards from the nearest water-holes, although at the height of the rainy 

 season a small marsh forms within 100 yards of the quarters, in which larvae of 

 Myzomyia funesta have been found. 



A collection of mosquitos which found their way into the Medical Officer's 

 quarters was made and in the order of frequency of their occurrence these 

 appeared to be : — (1) Mansonioides uniformis, (2) Culiciomyia nebulosa, (3) 

 Myzomyia Junesta, (4) Myzomyia costalis, and (5) Stegomyia fasciata. 



Examples of all the species bred were sent to the Entomological Research 

 Committee, and I am much indebted to Mr. F. W. Edwards, of the British 

 Museum, for kindly identifying them. 



Notes on the early stages. 



1. Myzorhynchus mauritianus, Grp. and paludis, Theo. 



Larvae found from June to December in water-holes shaded by overhanging* 

 grass or having water-weed growing on the surface ; also found at the edges of 

 the swamp. The larvae may be very dark grey in colour, showing lighter bands, 

 or a beautiful grass-green, when the palmate hairs may be easily seen with the 

 naked eye. When the larvae are dark in colour, the pupae are also dark ; and 

 similarly when the larvae are green, the pupae are green. 



I have been unable to distinguish between the larvae of M. mauritianus and 

 M. paludis; and it appears to me also that in the perfect insects specimens may 

 be found that are intermediate between the two forms. 



These larvae are difficult to rear in artificial conditions, and quite two-thirds 

 of them died before pupating. 



2. Nyssorhynchus squamosus, Theo. 



Larvae found in water-holes containing clear water overhung with grass, from 

 September to December. The larva is of a green colour and resembles that of 

 N. ivatsoni, Edw., but has palmate hairs on segments 2-7 (rudimentary on 1st). 

 Pupa of a green colour. 



3. Nyssorhynchus watsoni, Edw. var. 



Larvae found from September to December in shaded water-holes which often 

 contained filmy algae. The larva is green in colour and resembles that of 

 JSJ. squamosus, but may be distinguished with a pocket-lens, as it has palmate hairs 

 only on segments 3-7 and these are like the palmate hairs of M. paludis to some 

 extent. The pupae are green and not distinguishable from those of the preceding 

 species. 



