ig w. wesche the larval and 



The Pui\il. 



These are comparatively simple, and consequently difficult to differentiate^ 

 l)ut characters will be found in the respiratory trumpets and in the short 

 plumes and bunches of hair at the base of the thorax ; there are also small 

 plumes on the points of the seventh segment of the abdomen. This segment 

 also supports two plates (the anal plates), which vary in shape, in the 

 character of the thickening ribs, in the short bristles at the end of the 

 central rib, and in one instance (Cule.r quasigelidiis, Theo.) in having a 

 dark patch or cloud at the end. 



The eighth segment lies under the anal plates, and in some cases is furcate^ 

 containing the large forcipes of the male (PL VII, fig. d, & PI. VI, fig. 13). 

 In mature pup?e the sex of the future mosquito can be seen by an examination 

 of this part. The hairs on the segments of the abdomen are variable, but from 

 the difficulty of judging the angle of vision, they are unreliable characters. 



The respiratory trumpets are not jointed, and form a single valve outside 

 the thoracic sac. In certain specimens, however, owing to the transparency 

 of the pupal skin, the trumpets present the false appearance of an external 

 articulation ; but the button-shaped object at their base is actually on the 

 under side of the pupal skin_, and below that is a tube running to the thorax 

 of the contained imago. 



I may point out that I have purposely described the abdomen of the pupa 

 as only consisting of eight segments, as this is the appearance of the 

 organism^ when cursorily examined. The true first segment is very small and 

 difficult to make out ; in the case of Culex dissimiUs, Theo., which I have 

 mounted and carefully examined, it is certainly in a degenerate condition. 



Key to the Larv-E described. 



1. Siphon long- and thill, nearly as long as, or two-thirds the length of 



the abdomen 2. 



Siphon moderately short and thin, sides never curved, one-half, or 



one-third the length of the abdomen '.'.'. 7. 



Siphon short and stout, less than one-half the length of the 



abdomen '. 8, 



Siphon longer than abdomen. Antennae with doik distal joint and 



black spines at the tip Cule^v (juiarti, Blanch., p. 37. 



(PI. YII, fig. 4.) 

 Siphon undeveloped. (Axophelin.13.) (PL V, fig. 20.) 23. 



2. Anal papilkTe very long, three times as long as the anal segment. 



Culex imUidofhoracis, Theo., p. 36» 

 Papillae short •'. 3. 



3. Papillae equal in length : 4. 



Papillae unequal in length . 5. 



Siphon over ten times as long as its base ; anal segment with simple , [p. 48. 



hairs on the dorsal edge Fectinopalpus fuscus , Theo. ?.(If)> 



Siphon thirteen times as long as its base; anal segment with plumose 



hairs on the dorsal edge Cidex pullatus, Graham, p. 46, 



