460 MR. B. p. UVAUOV ON THE GEOGRAPHICAL DISTRIBUTION 



The northern boundary coincides with the chain of Pontus, 

 coming on tlie east very near to Batoum and embracing a narrow 

 strip of the Adzliarian chain; from here it runs southwards along 

 the A.rsian chain as far as Arax, where the contact of Armenian 

 and Aderbaidzhan fauna takes place ; farther on the boundary 

 turns eastwards along the chain of Aghridagh as far as Ararat, 

 from where it goes southwards along the Avatershed of the basins 

 of Urmiah and Tigris. The western boundary is presented by 

 the margin of the central plateau of Anatolia, and the southern 

 one goes in its western part along the Cilician Taurus and 

 Antitaurus, not yet being satisfactorily known farther eastwards 

 owing to the lack of investigation. I suppose it coincides with 

 the Armenian Taurus. 



As the territory of this district is far more extensive than 

 that of any other, it causes us to suppose that it should be divided 

 into two or more separate districts. Some modifications of the 

 Orthopberan fauna of diflerent parts of Armenia support this 

 conclusion, but I cannot offer any satisfactory division, as our 

 knowledge of the fauna of southern and south-eastern parts of 

 Armenia is extremely limited. Further investigations of this 

 district should be, therefore, of the greatest zoogeographical 

 interest. 



6. The Syrian Anatolia (A.S.) 



This district belongs to those which have been less investigated, 

 as is evident from the small number of species known of it, this 

 being only 106 (9M + 50 A + 38 L + 9G), though its southern 

 position and dry climate offer the best conditions for the develop- 

 ment of the richest Orthopteran fauna. 



As for the composition of its fauna, it may be regarded as veiy 

 closely related to the fauna of Syria proper, all differences being 

 of an accidental nature. On the contrary, the difference existing 

 between this fauna and that of Armenia is rather well defined in 

 the lack of the most characteristic Armenian endemics and in the 

 evident influence of the Eremian fauna which is a typical feature 

 of the fauna of Syria. 



The boundary between this district and the Armenian one 

 coincides with the southern limit of the latter district following 

 tlie chain of the Cilician Taurus ; along the Euphrat valley this 

 district penetrates into Armenia, as is to be seen on the map. 

 All the other boundaries of this district lie beyond the limits of 

 the country which we are studying now and are entirely unknowii 

 as yet. 



7. The Pontian district (P.). 



The fauna of this district includes 59 species of Orthoptera 

 (1 M + 27 A4-20 L + 11 G); having been well investigated it 

 cannot be considei'ed very rich. 



The analysis of the Pontian fauna shows us that it is very 

 closely related to the fauna of Western Anatolia, including only 



