23. Limnophilus griseus Linne 



Degeer, 1778: Plate XIV, Figure 15.- Kolenati, 1848:54-55.- Hagen, 

 1864:248.- Walser, 1864:50.- Preudhomme de Borre, 1870-1872:68.- 

 Ostwald, 1899:50-64.- Ulmer, 1902b:117.- Siltala, 1902:65-68, Figure 14.- 

 Struck, 190 3:94-95, Plate IV, Figure 7.- Ulmer, 1903:53-54.- Siltala, 

 1904c:53-56, Figure 12.- Ulmer, 1909:264, Figure 398.- Lestage, 1921 :729, 

 739, 747, Figure 255, k,r.- Lepneva, 1940:215. 



Full-grown larva. Length 15—18 mm. Head (Figure 404, A) wide, mainly 

 dark dorsally. Frontoclypeus chestnut brown, with yellowish, posterior 

 angle; area lateral to frontoclypeus also dark; eyes on a small, light area. 

 Dorsal stripes not differentiated, adjacent to frontal sutures and coronal 

 suture; posterior part of head with a well defined, light brownish space 

 between dorsal and lateral stripes; transverse rows of large dots on site 

 of dorsal stripes; longitudinal rows of large dots on site of lateral stripes, 

 and in space between stripes. Ventral surface brown, including gula, 

 lighter, and with groups of large dots near occipital foramen (Figure 404, B). 



Median anterior -margin seta short, brown, strong; intermediate 

 anterior -margin seta slightly larger; lateral anterior -margin seta light, 

 short, curved; anterior frontal seta light, procumbent, middle seta dark 

 brown, strong, moderately long, posterior seta small, thin. Seta 7 brown, 

 strong, as long as intermediate seta; seta 9 thick, dark brown, long; seta 11, 

 small, thin; seta 12 situated behind eye, dark, strong, moderately long; 

 seta 14 longer and thicker than 9; seta 13 small, thin; seta 15 thin, 

 moderately long, much shorter than 14; seta 16 light, procumbent; seta 17 

 strong, dark brown, moderately long, shorter than 15. Ventral seta 8 small, 

 dark, seta 18 minute. 



Labrum dark brown, with deep median indentation; seta 1 in form of a 

 small, blunt, light spine; seta 2 slightly larger; seta 4 also in form of a 

 blunt, small spine; seta 3 short, thin, light; setae 5 and 6 large, brown. 



Mandibles black, without a pinkish distal area; left mandible with 5 teeth, 

 middle tooth larger than others; the subventral of the 5 teeth on right 

 mandible larger than others, ventral tooth narrow, 3 dorsal teeth of equal 

 size, wide, rounded; setae situated basally, dorsal larger than ventral. 

 2or> Pronotum brown, groove in anterior third dark brown in middle; posterior 



median part darker; anterior margin brownish; posterior margin with 

 2 narrow, black, separate stripes; posterior -angle process with a large 

 dot. Punctation distinct; major setae of moderate length. 



Mesonotum chestnut brown anteriorly except laterally; other surface 

 lighter, brownish; posterior margin black, narrow; lateral margin wider, 

 posterior angle projecting. 



Prosternite pale, whitish (Figure 405), golden brown posteriorly, with 

 groups of pinkish dots laterally; horn short, grayish. Mesosternite 

 represented by a row of 6 large, pinkish dots on each side. Metathorax 

 ventrally with 3—4 whitish dots on each side. 



Legs brown, without punctation; coxa slightly darker than other segments. 

 Primary ventral setae of fore femur in form of 2 brownish spines, basal 

 spine blunt, almost half as long as apical spine; posterior seta short, dark. 



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