ERE EET ERE 
303 
guished from any other Culicid-larva. The sipho is short, no 
longer than the anal segment; anteriorly it is limitid by a dark, 
strongly chitinized ring. It may be described as consisting of two 
parts, an anterior part almost as broad as long, and a posterior 
g. 22. Sipho seen ryubrad 
Signification of letters in figs. 22 —34: a—d various aches of bristles; e e1 e2 the two 
main-tracheæ and the part derived from the muftdnen of the two slema(e 2); f ventral 
muscles: v1 muscles 
=] 
ge | æ… 
-ø 
= 
ee 
aen of tes inner ak e; ske muscles of the chit 
With its ligament; æx y muscle which communicate with hose Gi ) of the anal segment ; 
z oblique muscles to the flaps: æ ganglior 
part shaped like a curved tube. The first part is covered by a 
yellowish, rather friable chitin, the other part is almost black and 
evidently very hardly chitinized. The tube is much narrower than 
the anterior part. Laterally, between the two parts, there is a 
