78 



slightly darker; nervures fuscous and slender; 1-st and 2-nd apical 

 forks beginning at the same level. 



cf. 9-th dorsal segment produced into a long and broad yellow 

 projection (fig. 7 — 8) bearing on the apex two small lateral teeth and 

 a median process, triangular if seen from above, and curved somewhat 

 downwards; below the base of this dorsal projection, in the middle, arises 

 an unpaired process in the shape of a narrow plate; from the side this 

 process is slender and acute at the end. 1-st joint of the pedes genitales 

 rather short and very broad; second divided by a deep excision 

 near the upper base into a lower lobe long and triangular from side, 

 and into an upper lobe, short in the form of a plate very narrow from 

 side; the lower one bearing on its inner side numerous short yellowish 



Рис. 7. Rhyacophila impar, sp. n. J 1 . 

 Конецъ брюшка сбоку. 



Рис. 8. Rhyacophila impar, sp. 

 n. J 1 . Конецъ брюшка сверху. 



setae. Titillatores with some spinules at the ends; penis rather slender, 

 slightly curved upwards (fig. 9). 



Length of the body 9 mm. 



Our specimen has an anomalous feature. The second apical fork 

 of posterior both wings and the right anterior is provided with trans- 

 verse nervure at the end of the first third of its length; second fork of 

 the left anterior wing shows two black transverse thickenings at the 

 same place. 



This species is distinct and can not he included into any Euro- 

 paeau group. 



Голова и грудь черно-коричневый, ляжки снизу коричневый, 

 ноги темножелтоватыя; на переднихъ и среднихъ ногахъ бедра въ 

 основной части, а голени у концовъ буроватыя, тарзальные членики 

 темножелтоватые; брюшко коричневое, снизу несколько свЪтл'Ье. 

 Основной блБднокоричневатый фонъ переднихъ крыльевъ представ- 

 ленъ лишь неясной сеткой, такъ какъ нанолненъ многочисленными 

 сливающимися блвднымп включешями; темный пятна имеются на кон - 

 Revue Russe d'Entom. XIV. 1914. № 1. 



