﻿AT BOLE, NORTHERN TERRITORIES, GOLD COAST. 77 



connected with rods passing through the dark portion of the tube ; as muscular 

 bands pass up the basal portion of the tubes, possibly the hooks are capable of 

 being extruded and retracted. The dark portion of the siphon-tube also exhibits 

 a peculiar serrated outline on the dorsal aspect, when seen from the side, and 

 there is a corresponding but much finer grooving visible on the ventral aspect in 

 one of the specimens, suggesting that this apical portion of the tube may be bent 

 dorsally. The siphon-tube has a plume of simple hairs half-way up on either 

 side ; there is also a subsiphonal plume of simple hairs. The comb is curious, 

 consisting of only two stout blunt-ended bristles. 



The anal segment is about as long as the siphon-tube, and has a stout ventral 

 beard of simple hairs and well developed plumes on the dorsal edge. There are, 

 in addition, four tufts of hairs along the ventral aspect, and four short anal 

 papillae. 



The mature larva shows on the ventral surface two very stout, highly 

 chitinised hooks, which are evidently the hooks which are visible within the 

 trumpets of the pupa and by means of which it (the pupa) attaches itself to 

 the roots of the water-plant, as mentioned already. 



11. Culex quasigelidus, Theo. 



Larvae found from October to December in borrow-pits containing clear 

 water, overhung with grass and covered with algae. The larva is banded 

 alternately light and dark ; the pupa very dark. This species is difficult to rear 

 in artificial conditions ; it takes long to pupate and the insect often fails to 

 emerge from the pupal case. 



12. Culex ag , er, Giles, var. ethiopicus, Edw. 



Long-siphoned larvae of a green colour, found in water-holes containing clear 

 water, in which were floating semi-submerged, filmy algae {Spirogyra ?). June to 

 December. The pupae have forwardly-directed trumpets with large openings. 



13. Culex duttoni, Theo. 



These larvae were obtained in many of the water-holes which contained some- 

 what foul water ; they were also to be found in domestic cooking utensils 

 whenever water was allowed to accumulate in them for a few days. Occurrence — 

 June to December. 



14. Culex annulioris, Theo. 



The larvae occur in clear water, containing filmy algae, and are green in colour 

 with a long siphon-tube ; they are difficult to distinguish from the larvae of 

 Culex ager, with which they are often found. Occurrence — July and December. 

 The pupa has forwardly-directed trumpets with a large aperture. 



15. Culex univittatus, Theo. 



The commonest Culicid larva, found in nearly all the water-holes from June 

 to December. The pupa is small, with the sides of the thorax almost parallel. 



16. Culex invidiosus, Theo. 



Larva chiefly found in July, August and December ; it has a superficial 

 resemblance to that of the preceding species. The pupa is larger than that of 

 C. univittatus and has the sides of the thorax rounded. 



