CADDIS-FLIES 263 



condition. Unfortunately, it has almost disappeared 

 from this river, and, as stated in an earlier chapter, 

 all efforts have failed so far to reintroduce it. The 

 following is a description of it in brief : — 



Larva, slender and subcylindrical. Case, a four- 

 sided tube of vegetable matter tapering slightly towards 

 the tail (shown in Fig. 49). Pupa, 



• •! . Tj/ J.1 -J J J- Fig. 49. Grannom Caddis X 3 



smiilar to Khyacophtla aorsans, «^~^j«^^^<'«r"W«r»i. 



but with a dull blue-green body. f%^MM^MlP"i^ 

 When the pupa is rising in the 



water to assume the imago stage it usually spins 

 round and round on the surface as the thin pupal 

 shuck distends and splits, allowing the perfect insect 

 to emerge. The fly is only of moderate size, the 

 wings a pale smoky grey membrane marked with 

 yellowish or fawn-coloured hairs or spots and with 

 whitish fringes. Its body immediately after its 

 change from the pupa is a yellowish grey-green 

 colour. The female subsequently carries an enor- 

 mous oval mass of blue-green eggs at the tail end 

 of the abdomen. 



Notidobia ciliaris is the scientific name in " Dry-Fly 



Entomology " I have given to 

 Notidobia ciliaris. the brown silverhorns. This 



I must confess is a mistake, as 

 I am convinced that the brown silverhorns of the 

 Hampshire fishermen is Leptocerus cinereus. Fig. 50 

 is a drawing of the male Notidobia ciliaris. It is a fly 

 which is very plentiful on chalk-streams and other rivers, 

 and is best imitated by the small dark sedge, No. 31. 



