6 4 



HYDROPSYCHE SPECIES 



largest of the three, and guttata perhaps the 

 most abundant on the Test. I show the geni- 



FIG. 35. Genitalia of Hydropsychc guttata, <J . 

 A. from above. B. from the side. 



talia of this last-named fly in Fig. 35, and the 

 neuration of the wings is illustrated in Fig. i 

 on p. ii. 



Family . . POLYCENTROPID.B 

 Genus . . Polycentropus 

 Species . . ftavomaculatus 

 Spurs, 3.4.4. 



A description is given with a drawing of the 

 genitalia of this little caddis-fly, on account of 

 its great abundance in almost every river. 

 Quite small, it is very active, and runs about 

 during the daytime up and down the stems 

 of grasses by the edge of the water. The 

 wings are dark brown spotted with gold, and 

 the thorax is densely clothed with light -coloured 

 hairs. The male genitalia are shown in Fig. 36. 

 Other species belonging to this genus are kingi 

 and multiguttatm. 



