850 WAHLGREN, ON SOME APTERYGOGENBA. 



The length of the animal is 2,5 — 3 mm. 



Our species was found first, as the collector informs iis, in 

 Single and scattered speciraens but låter in a numerous »colony» 

 under stones on one of the terraces on the steep slope of the 

 Mangischlak promontory in Transcaspia, not far from Fort 

 Alexaudrowsk. 



Isotoma palustris MÜLLER /. prasina Reuter was found 

 together with the two foUowing species on the surface of the 

 water in a stagnant pool near the main fishery establishment of 

 Saposhnikov in the Volga-delta. The species (not the variety) 

 is known from two other localities in South Russia, lying further 

 west, viz: Kiew (Scherbakow) ') and Kharkow (Skorikow) 2). 



Podura aquatica LiNNÉ was found in väst numbers in the 

 locality mentioned above. It was known before both from Kiew 

 (ScHBRBAKOw) and from Kharkow (Skorikow). 



Xenylla maritima Tullberg. Some few specimens were 

 collected together with the foregoing; it has been observed by 

 Scherbakow at Kiew. 



All these three have a very wide geographica! distribution. 



II. Thysanura. 



Lepisma sacdiarina LiNNÉ, which was also known by the 

 two Russian authors, mentioned above, from Kiew and Kharkow, 

 was taken under a stone on the slope of the Mangischlak pro- 

 montory in Transcaspia. 



') A. Scherbakow. Einige BemerltungeE über Ai)terygogenea, die bei Kiew 



1896—1897 gefanden wurden. Zool. Anz. 1898. 

 -) A. Skorikow. Liste des Thysanoures des environs de Kharkow. Kharkow 1897. 



