Larval Characters. 



LARVAL CHARACTERS. 



A great deal has been done in America on Culicid larvae 

 since the issue of the last volume. A large number of forms are 

 now definitely known. The chief work has been done by 

 Professor Felt, Professor C. B. Smith and Dr. Dyar. Dr. Grabham 

 has also worked out a number of Jamaican forms; Professor 

 Goeldi, some in South America, and a few are described from 

 other regions in this volume. 



Dr. Dyar and Mr. F. Knab in the paper referred to on p. 13 

 have described a number of forms, but as in most cases the adults 

 are not known at present, the descriptions lose their value. It 



Fig. 1. 



Diagram of larva. 



A, Antenna ; a 1? lateral tuft ; a 2 , apical spines ; B, thorax ; C, abdominal segments ; 

 D, siphon : E, pecten of siphon ; Ei, pecten scales ; H, anal gills ; G, comb of 

 8th segment ; Gi, comb scale ; H, eyes ; I, 8th segment ; J and Ji, labial plate ; 

 F, siphon tuft. 



is hoped by degrees they may be traced to the adults so that the 

 correct names may be known. 



The characters used for identifying the larvae of Anophelinae 

 made most use of, are (i) the frontal hairs of the head ; (ii) the 

 structure of the antennae ; and (iii) the structure of the palmate 

 hairs. These have been referred to in the previous volumes, and 

 need not be further considered here. 



In the Culicinae the chief characters of diagnostic value are, 

 (i) the form of the clypeus (Fig. Jl) ; (ii) the structure of the 

 antennae (A and al); (iii) the form of the siphon (D) ; and 

 (iv) the number and structure of the spines forming the pecten 

 on the siphon (E) and on the so-called comb at its base 

 (G and Gl). 



