3() W. WESCHP] THE LARVAL AND 



14. Culex tigripes, Grandpre, var. fusca, Theo. 



Larva. 



Head moderately large, light in colour. Antenn?e short and simple, plume 

 ahsent, only a few short hairs at the tip. Mouth with remarkable stout 

 chitinised hairs on the brush, which, seen with higher magnification, show a 

 beautiful microscopic structure of minute pectination on a large portion of 

 each hair (PI. Ill, fig. 15 j. No plumes on the face. 



Thorax Avell differentiated, with moderate-sized plumes of plumose hairs. 



Abdomen with plumes of plumose hairs on segments 1-4 and double hairs 

 on segments 5-7. Comb with about 30 scales in several rows, which are 

 rather small ; seen dorsally they have a spinose appearance. 



The siphon is peculiar and characteristic ; it has a very rough surface, and 

 is bearded down the ventral side between the rows of spines with long 

 plumose hairs ; it is under three times as long as the base (PI. Ill, figs. 13 & 14), 



The anal segment is strikingly prolonged at its dorsal edge, and has an 

 even rougher and more serrate surface than the siphon ; the papillpe are 

 short, and there is a long ventral beard (PL III, fig. 12). 



The larvsR are 5 mm. long. 



Plpa. 



The pupa has rather stout trumpets ; the plumes on the seventh segment 

 consist of plumose hairs, and there are similar plumes on the sixth segment ; 

 the ribs that strengthen the anal plates carry two minute hairs instead of a 

 spine; there are no hairs on the head (PL III, fig. 16). 



Length of thorax 2 mm. 



Described from six larvse and three pupse. 



[Larvae found in a large water- hole, the water of which was milky-coloured 

 and opaque. These larv?e were very carnivorous, and fed upon other speci- 

 mens of larvae, or upon each other when other species were not available. 

 The attack was usually made by seizing the victim^s siphon near the base 

 and biting it through. The larv?e of .Pf/retoj:>horus costalis were found in the 

 same water-hole. It is possible that this carnivorous larva may be useful 

 by acting as a destroyer of the larvae of Pi/retoplwrus costalis and of Myzo^ 

 rliynrhus mauritianus. Egg-raft small, rounded, of 25 to 40 eggs; the latter 

 brown, with black apex. The eggs hatch in about 24 hours.— W. M. G.] 



15. Cnlex pallid othoracis, Theo. 



Larva. 

 Head very large in proportion to the thorax. Antennae covered on both 

 joints with minute spines, and carrying a large plume of plumose hairs; 

 the distal joint is slightly darker, and has one strong black spine at its end 



