THE NEMOURA SPECIES 



75 



autumn as to be a positive nuisance to the 



fisherman. It settles on the face and clothing, 



dropping from the trees, 



and eludes removal with 



great agility. The female 



deposits the eggs by letting 



them fall in a mass from 



some little height above the 



water. I give a figure of 



the genitalia of the male 



insect (Fig. 42). Another 



species of Leuctra is found 



on the Test at the same time 



as geniculata L. klapdleki. 



It is smaller and darker 



than geniculata, the true 



willow fly, and the fish take 



it equally freely. 



I give a drawing of the wings of L. hippopus, 

 a species plentiful on the river Dove, in Fig. 43. 



FIG. 42. Genitalia of 



Leuctra gen iculata , 



, from above. 



Family . . 



Genus . . Nemoura 



Species . . meyeri 



PLATE XV 



I give Nemoura meyeri as a type of a whole 

 group of small stone-flies very plentiful on m 

 streams other than those arising from the chalk. 

 The genus Nemoura has a Greek-cross-like con- 

 figuration of nervures in the wings, which is 

 shown in the Plate. I have heard Nemoura 

 meyeri described as the early brown, but I 



