﻿AT BOLE, NORTHERN TERRITORIES, GOLD COAST. 75 



4. Myzomyia funesta, Giles. 



The commonest Anopheline larva, found in almost all water-holes containing 

 clear water, and also in the swamp. It occurs from June to December, but is 

 commonest in August and September. Both larva and pupa are almost black 

 in colour, though the pupa when first hatched shows transverse lighter bands and 

 the larvae may show white markings on the thorax and abdomen. 



5. Myzomyia eostalis, Lw. 



Larvae found chiefly in one water-hole containing opalescent water, but at the 

 height of the rains they were found in the hoof-marks of cattle and in puddles 

 containing muddy water in the neighbourhood of the swamp. They were common 

 from June to September, almost absent in October, and occurred rarely in the 

 larger water-holes during November and December. 



6. Stegomyia sugens, Wied. 



Larvae very common in shallow rock-pools throughout the rainy season ; after 

 the middle of October they were found scantily in some of the water-holes. 

 Both larvae and pupae are very dark in colour, approximating to the colour of 

 the bottom of the rock-pools. 



7. Stegomyia fasciata, F. 



The larvae of this species were found in native water-holes from June to 

 December. 



8. Ochlerotatus nigeriensis, Thee. 



The larvae were only found for two days during November in a muddy pool 

 formed by a shower of rain. They looked like the larvae of Stegomyia sugens,hut 

 as the larvae of that mosquito usually occurred in clear water, they were collected 

 and bred out. The larva is very dark in colour and has only a short siphon- 

 tube ; the pupa is also dark, and active. 



9. Aedomyia catasticta, Knab. 



Larvae found in a borrow-pit containing clear water, overgrown with the same 

 water-plant [Pistia stratiotes] which serves as a protection for Mansonia larvae ; 

 September to December. If disturbed when in a glass vessel the larva descends 

 to the bottom and will remain below for many minutes, lying with the ventral 

 surface uppermost, seemingly balanced on its siphon-tube and the dorsum of its 

 thorax ; it appears to feed in this position. The pupa shows a curious chequered 

 pattern on the thorax when newly formed. 



10. Mansonioides uniformis, Theo. 



Larvae only found in borrow-pits containing fairly clear water, overgrown 

 with a water-plant [ Pistia stratiotes]. To secure the larvae it was necessary to 

 scoop up pieces of the plant in the dipper and shake these vigorously before 

 extracting them from the water ; the larvae were then readily picked out from 

 the sediment which settled at the bottom of the dipper. 



The larvae are pearl-grey in colour, with a peculiar conical black-tipped siphon- 

 tube and a longish anal segment, with dorsal and ventral plumes extending 

 ofltwards almost at right angles, giving it a T-shaped appearance. They 

 progress with a wriggling movement like a Stegomyia larva. 



