4. Hydropsyche pellucidula Curtis 



Struck, 1899:342, Figure 30; 1900:27, Figure 46; 1903: 118-1 19, Plate VII, 

 Figure 1. - Ulmer, 1903:115, Figures 8, 20, 33, 43, 69, 78, 105; 1903a:ll-15, 

 Figures 1-10; 1909:236,301,- Lestage, 1921 :537, 543, Figure 1 78. - 

 Lepneva, 1928:25-26; 1940:207. 



Full-grown larva. Length 17— 18mm; resembling larva of H. angusti- 

 pennis but darker. Anterior part of frontoclypeus (Figure 699, A; 699, C) 

 with 2 light lateral spots, sometimes also with a less distinct median spot; 

 instead of 3 spots, light specimens have a wide spot with a dark forked median 

 stripe which is divided into 2 lateral spots and one median spot, common in 

 dark larvae; an indistinct light spot in the posterior angle; other part of 

 498 dorsal surface, except the light band near the occipital foramen and light 

 periocular area, is dark. Ventral side of head, except light stripe near the 

 anterior margin and along the median suture, dark (Figure 699, B); sides 

 between dorsal and ventral dark figure brown. Primary setae as in 

 H. angustipennis, light; seta 9 longer and darker than others. Minute 

 covering setae (Figure 699, D) numerous. 



(497) 



FIGURE 699. Hydropsyche pellucidula Curt. Head, dorsal (A) and ventral (B); 

 frontoclypeus (C), covering setae of head (D) 



568 



