THE GROUSE-WING 63 



Family . . LEPTOCERID^E 

 Genus . . Mystacides 

 Species . . longicornis 

 Spurs, 0.2.2. 



PLATE XII 



Mystacides longicornis is known in the north Mystacide 

 as the grouse- wing, from the close resemblance g^oSwi 

 that the colours and markings of the wings bear 

 to some of the grouse feathers. It frequents 

 still waters, such as canals and reservoirs, and 

 in such localities occurs in considerable abund- 

 ance towards August and September. I have 

 found it on the canal at Newbury, on the Hythe 

 military canal, on some ponds at Great Missen- 

 den, and on a lake in the immediate neighbour- 

 hood of the Test. 



Family . . HYDROPSCYHID.E 

 Genus . . Hydropsyche 

 Species . . instaUlis. 

 Spurs, 2.4.4. 



PLATE XIII 



Hydropsyche instabilis belongs to a group Hydrop- 

 of caddis-flies which come out of their hiding- Sstabais. 

 places in bright weather and dance about in 

 clouds in the sunlight. The eaves of fishing- 

 huts form favourite places for such gatherings. 

 During May and June numbers of two other 

 species, H. guttata and H. pellucidula, are 

 usually to be seen, the last named being the 



