CADDIS-FLIES 273 



The spur formula for both sexes of this genus 



is I, 2, 3. 

 Ecclisopteryx. Ecclisopteryx guttulata. The 



general characters of the flies 

 of this genus are similar to those of Drusus, 

 but of course the difference in the spur formula 

 will at once enable the student to separate these 

 two genera. It is said to be widely distributed, ap- 

 pearing in May, June and July in the North of 

 England, Scotland, etc. A specimen was sent to 

 Mosely for the Fly-Fishers' Club cabinet by Mr. 

 John Henderson, jun., from the River Neath, and 

 the fly is found quite plentifully on the Dove towards 

 the end of May. 



In this genus of the Limnophilidae the spur formula 



for the male is o, 3, 3, and for 

 Chaetopteryx. the female i, 3, 3. 



Ch(stopteryx villosa. This 

 is a most unmistakable insect when once it has been 

 seen. The derivation of its scientific name — xairn, a 

 mane, and -n-Tepv^, a wing — indicates at once the nature 

 of the fly. Its wings are short and broad, with 

 long, erect hairs inserted partly upon the nervures 

 and, to a large extent, upon granulation scattered 

 over the membrane. This gives a fairly good repre- 

 sentation of a mane on the wings. It is a moder- 

 ately small insect of a medium-sedge colour, and 

 is covered with pubescence and hairs. It is fairly 

 plentiful on the Test, Itchen, Kennet and other 

 rivers. 



