79 
Note , two rows of spines, 4 the pecten,’ on the 
posterior aspect of the syphon tube, starting from the 
base and extending a variable distance up the syphon 
tube ; note that they differ much in number and 
shape, etc., in different species. In some species (e.g., 
in cannibal larvae) a large fan of hairs projects pos- 
Fig. 27. Respiratory Syphons of Larvae. 
(1) Stegomyia sp. ; (2) Culex sp. ; (3) Culex with Large Syphon Lube ; 
(4) Laeniorhynchus sp. ; (5) Cannibal Larva (? C. concolor ) ; 
(6) Enormous Syphon Lube (one quarter scale of others , 
genus undetermined) ; (7) Spine on Lube seen on 
the flat ; (8) Spine seen sideways 
teriorly in the median line from the syphon tube. In 
certain species the syphon tube is of enormous size, 
and may attain to one-third the length of the larva. 
On the eighth segment at the base of the syphon is a 
group of scales, the 4 comb.’ It differs much in 
