yellow, with a broad dark brown posterior margin; metanotum light brown, 

 with dark brown posterior margin. Pronotum with the upward-directed 

 seta M, anteriorly-directed setae A and a, and 3 yellow setae of group m 

 near the anterior margin; the 2 median setae of the latter group are curved 

 anteriorly and the lateral seta is straight; seta L near the lateral margin; 

 the small setae 1 are not marked; surface setae situated in the middle of 

 351 the sclerite; the median group consists of 3 setae (l, 2, 5) the lateral group 

 of 2 setae (3 and 4) situated behind each other. Two setae (O and m) in the 

 middle of the anterior margin of the mesonotum; angle of sclerite with 

 3 setae (A, a, ai); angle of metanotum with 4 setae (A, a, ai, a2). There are 

 3 primary surface setae situated close together near the posterior margin 

 of the metanotum; they are situated slightly away from the posterior 

 margin, on the mesonotum. 



The horn of the trochantin of the prothorax is fused with the episternum; 

 it is brown on the outer side; distal seta at the base of the membranous apex 

 short and thick; transverse membranous stripe of epimeron broad, as in 

 the other species; seta of epimeron longer than the other setae of the 

 pleuron. Setae of the pleuron of meso- and metathorax similar; episternum 

 complete, with a longer seta; seta of epimeron shorter but thicker. 



[352) 



FIGURE 458. Leiochiton fagesii Guin. Larva in its case (A), 

 pupal case on a leaf of P o t a m o g e t o n (B) 



Forelegs (Figure 456) different from the other legs as in species of 

 Oxyethira; distal process of tibia with 2 ventral setae which form light 

 and strong spines; anterior spine of this group shorter than the posterior; 

 352 a spatulate process with short, dark setuliform spinules on the ventral side 

 of the segment near the apex of the process; pale sparse hairs basal to 

 this process. The longest segment of midlegs and hind legs is the tibia; 



390 



