288 



A Monograph of Cidiciclae. 



Fig. 94. 



Comb of Grabhamia ja7naicerms. Theobald. 

 (After Felt.) 



Mid spine of 

 comb. 



When the larva rises to the surface it assumes at first the 

 position of a Culex, but after a moment, if left undisturbed, the 

 body with a slight jerk floats quickly to an ap- 

 proximately horizontal position, with the head on a 

 level with the surface of the water. It differs from 

 Anopheles in this respect, however, that like a piece 

 of slack rope, that it is curved down between the 

 head and respiratory tube. The tube projects at least 

 a third of its length out of the water. They are 

 constantly swimming about in a backward direc- 

 tion. The anal filaments are much longer and more 

 slender than in Culex. Professor Glenn-Herrick 

 says the respiratory tube is much longer than in 

 Culex fatiyans. The figure does not show this, 

 and a character of this genus is the short larval 

 siphon. The antennae have a small lateral tuft 

 towards the apex. The comb on the eighth seg- 

 ment, is composed of conspicuously toothed spines 

 joined on a weak basal segment. The pupae are 

 large and are figured with long siphons, with two 

 tier* at the truncated end. This stage lasts, according to Pro- 

 r Herrick, forty-eight hours. The eggs are laid singly, as 



Pig. !»:.. 



Grabhamia 



/(iinnir, 

 Larval siphon. 



