Rhithrogena ussingi E. Peters, and 

 its Larva. 



By 

 P. Esben-Petersen, Silkeborg". 



When the above named species was described (Ent. 

 jMedd. Kbhvn., p. 313, IQIO) only two male specimens 

 kept in alcohol were at hand. Since then I have collec- 

 ted the species at its first locality and in Grejsdal, 4. June 

 IQIO, both places situated near to each other. Last year 

 my friend J. Kr. Findal, Aarhus, found the species at a 

 more northerly situated place, Jexen river, 14 km. west 

 and 5 km. south of Aarhus, 10 km. north and 5 km. east 

 of Skanderborg; in spring 1Q14 he also found the larva 

 at the same place. 



On May 2nd we both, together with other entomolo- 

 gical friends, visited the place, and we fortunately found 

 both the imagines, J 9; ^nd the fullgrown larvæ in 

 numbers. 



With regard to the description I have only a few re- 

 marks to add: The venter of the abdomen is much pa- 

 ler than the dorsum and with yellowish joinings- of the 

 segments. Penis yellowish, its tips brownish. Fore fe- 

 mora of the male dark brown with a broad pitchy black 

 median band, fore tarsus and tibia brown to blackish 

 brown. Intermediate and hind femoræ pale brown with 

 a blackish band; tibiæ yellowish; tarsi pale greyish brown, 

 paler at the joinings and with blackish claws. 



