THE CAPERER 47 



to in an earlier chapter, is the difference in 

 the number of spurs present in the two sexes, 

 the male having- one less than the female on the 

 anterior tibae. 



This fly will be easily recognised by the very 

 hairy appearance of the wings, which literally 

 bristle with long stiff hairs. It is subject to 

 great variety in size, and the larva makes a 

 rough case of miscellaneous material. I give a 

 figure of the pupal grating, which has a char- 

 acter of its own, though akin in construction 

 to those of Limnophilus lunatus and rhombictts. 

 This is to be expected, as all three belong to 

 one family. The reader should note how widely 

 the grating differs from the pattern made by 

 members of the Sericostomatida group. 



Family . . LIMNOPHILID^E 

 Genus . . Halesus 

 Species . . radiatus 

 Spurs, 1.3.3. 



PLATE IX 



This insect is the caperer of the trout fisher- 

 man, and is a large, strikingly marked fly not 

 likely to be confused with any but the closely 

 allied species Halesus digitatus. So nearly alike 

 are these two that the popular name can quite di s itatus - 

 legitimately be applied to both species. On 

 the Test H. digitatus is not so abundant as H. 

 radiatus ; it is somewhat larger, and has slightly 



