272 THE DRY-FLY MAN'S HANDBOOK 



Very plentiful in July and August, and appears 

 just at dusk in great quantities along the river- 

 banks. 



Stenophylax latipennis.— McLachlan says, " I know of 

 no general characters whereby to separate this 

 from the large-sized individuals of stellatus ; the 

 colours are possibly slightly paler (more testa- 

 ceous) on an average." Mr. John Henderson 

 has found it on the Dove in the early spring, and 

 date of its appearance is perhaps the best indica- 

 tion of its species. 

 The spur formula for both sexes of the genus 

 Halesus is i, 3, 3. 

 Halesus. Halesus radiatus is the well- 



known caperer shown at Fig. 

 35. It has broad fore-wings, parabolic at the tip and 

 of a yellow grey colour streaked longitudinally with 

 darker grey in most of the areas and cellules. It is a 

 large insect. 



Halesus digitatus. Very similar to the foregoing 

 species and plentiful in the South of England. It has 

 also been found in Scotland in the Clyde district. 

 Rather larger and paler than H. radiatus. 



In this genus the spur formula of both male and 

 female is i, 3, 3. 

 Drusus. Drustts annulatus is a 



medium-sized brownish sedge- 

 fly, of which McLachlan says that it is not uncommon 

 in rocky and mountainous districts of England and 

 Scotland in summer and early autumn. 



