175 



39 (38). Larva larger, to 16 mm; pronotum, mesonotum, and head dark 



brown; posterior surface seta of fore femur situated basal to 

 primary ventral setae; case straight, smooth, slightly narrower 

 posteriorly, made of large, brown, leaf fragments of varying 

 size 22. L. ignavus McL. (p. 286) 



40 (33). Head colored differently; groove in anterior third of pronotum, 



dark in middle. 



41 (44). Pattern on frontoclypeus consisting of large, distinct dots, divided 



from dorsal stripes by a more or less distinct, light space; dorsal 

 stripes present; pronotum light, with distinct, dark punctation, and 

 a dark stripe in anterior third. 



42 (43). Head mainly yellowish brown, pattern more or less distinct; dark 



pattern on frontoclypeus wider anteriorly, resembling pattern 

 of species of the rhombicus group, posterior angle with small 

 light spot; dorsal stripes distinct, with distinct dark punctation; 

 anterior third of pronotum slightly dark, without punctation; 

 abdominal segment 2 without lateral, presegmental gills; ventral 

 presegmental gills and dorsal presegmental gills of segment 2 

 sometimes also of segments 3-4, with 2 filaments; case straight, 

 rough, made of dark, longitudinally or obliquely arranged plant par- 

 ticles of different size; sand grains, or mica platelets present at 

 anterior end of older cases; case before pupation built of sand grains 

 and dark fragments of detritus 11. L. lunatus Curt. (p. 258) 



43 (42). Larva darker; frontoclypeus almost entirely dark; dorsal stripes 



less distinct, head with coarse punctation; anterior third of 

 pronotum with coarse punctation; abdominal segment 2 with lateral 

 presegmental gills; ventral and dorsal presegmental gills of 

 abdominal segments 2—3 with 3 filaments; case made of sand 



grains, slightly curved, slightly narrower posteriorly 



12. L. fuscicornis Ramb.(p. 26l) 



44 (41). Frontoclypeus entirely dark, with indistinct punctation; dorsal 



stripes on dark background, invisible or indistinct; pronotum 

 dark, groove of anterior third with dark stripe. 



45 (46). Punctation of frontoclypeus and dorsal stripes indistinct; claws 



narrow, long; case straight, made of small, thin, irregular leaf 

 fragments 24. L. tncisus Curt. (p. 290) 



46 (45). Frontoclypeus dark, without punctation; dorsal stripes with 



indistinct punctation; claws short, thick; case straight, made of 



different, longitudinally arranged plant particles 



18. L.xanthodes McL. (p. 280) 



1. Limnophilus rhombicus Linne 



Rosel von Rosenhof, 1746:71-74, Plate XV, Figure 1, Plate XVI, Figure 3. 

 Pictet, 1834:149-151, Plate IX, Figure 1, a-d. - Kolenati, 1848:26.- Hagen, 

 1864:243.- Meyer, 1864:161.- Walser, 1864:54-58.- Lampert, 1900:202, 

 Figure 74.- Struck, 1900:20, Figure 33 a-d.- Ulmer, 1901 : 223-226, 

 Figure 1.- Siltala, 1902 : 43-48, Plate IB, 8 a-e, Plate IIA, 8f-t.- Struck, 

 1903:74, Plate I, 15.- Ulmer, 1903:59, Figure F; 1903b: 197.- Siltala, 

 1907:495-496, 507-510.- Ulmer, 1909:257-259, Figure 387b.- Lestage, 

 1921:729-731, 744,748, Figure 255 e. m, t. - Lepneva, 1940:212-215, 

 Figures 159, 160.- Ross, 1944:185-186, Figure 648.- Hickin, 1948:54-56, 

 Figures 1-10.- Flint, 1960:49, Figure 24. 



218 



