158 PROCEEDINGS OF THE AMERICAN ACADEMY 



Tlierc has lately appeared an insufficient preliminary notice, 

 by Whulimir Scliinikewitscli,* of an Aslucus from the neighbor- 

 hood of the town of Toorkistan in the valley of the Jaxartes. It 

 is closely related to A. JiuviutiUs and A. leptodactylus, perhaps not 

 siDecifically distinct from one of these. Schimkewitsch affirms 

 that intermediate forms coanect A. pachi/jyus with A. leptodactylus 

 (Government of Riazan) and A. leptodactylus with A. Jluviatilis 

 (Governments of Toola and Moscow). 



68. AsTAcus PACiivrus. 



Astacus paclii/pus, Rathke, op. cit., p. 365. 1836. 



Astctcus Cdspiiis, Eichwald, Bull. Soc. Imper. Nat. Moscou, 

 1838, p. 14!).— Fauna Caspio-Caucasia, p. 181, PI. XXXVI. 

 fig. 2. 1841. 



Astacus pac/typus, Erichson, op. cit., p. 91. 1846 (after 

 Rathke). 



Astacus Caspius, Erichson, op. cit., p. 92 (after Eichwald). 



Astacus JlitfiatiliSjVar. jmcliypus et Caspius, Gerstfeldt, op. cit., 

 pp. 566, 584. 1859. 



Astacus pachypus, Heller, op. cit., p. 217. 1863. 



Astacus paclnjpus, Kessler, op. cit., p. 254. 1874. 



llab. Brackish waters of the Caspian Sea and estuaries of 

 rivers flowing into the Caspian and Black Seas. 



69. Astacus Colchicus. 



Astacus Colchicus, Kessler, Bull. Soc. Imper. Nat. Moscou, 

 L. 2. 1876. 



Ilab. Upper portion of Rion River and tributaries, Asiatic 

 Russia. It ha~! been artificially introduced into some of the trib- 

 utaries of the Upper Koor (anc. Cyrus). (Kessler.) 



* Der turkestanisclie Flusskrt'bs. (Vorlaufige Mittheihing.) Von Wladimir 

 Schimkewitsch. Zoologischer Anzeiger, VII. 339, 23 Juni, 1884. 



