26 K. LÖNNBERG, THE ICHTHYOLOGY OF THE CASPIAN SEA. 



gether with herring upon which it is preying. This was 

 also the case with these which were caught at Petrovsk. 



In Kura and Lenkoranka river the salmon was said to 

 ascend during September — December. 



Stenodus leucichthys Guldenstaedt. 



Total length in mm 825 



Lengtli of head in % of total length 19,1 



Prseorbital length » » » ■> « 4,0 



Postorbital > . > » > » 12,3 



Least height of caudal peduncle »»» » » 5,1 



Distance from snout to dorsal fin . » » » » 47,2 



Postabdominal length >»> » > 24,1 



Prseabdominal » »»»> » 29,0 



Distance from snout to ventral fins »»» > » 49,4 



Length of maxillary » » . » > 5,9 



> » mandible »»» > > 8,9 



It was difficult for me to get any opportunity of study- 

 ing this fish because I only saw large specimens which were 

 sold at high prices in the märket. The only »belorybitsa» 1 

 could get hold of was therefore one from which the above 

 measnrements ^ have been taken. It was given to me by the 

 commanding officer of Fort Alexandrovsk, Transcaspia, and 

 had been caught in a seine at the seashore together with 

 Clupea delicatula and Ätherina upon which iishes it is preying. 



It was a female. The relative length of the head agrees 

 with the same of the specimen measured by Smitt (1. c. p. 

 208 — 10). The distance of the dorsal fin from the snout is a 

 little larger in this specimen. The same is also the case 

 with the preeabdominal length, and wåth the distance from 

 the snout to the ventral fins. It ought, however to be ob- 

 served that these two percentages, according to Smitt's mea- 

 snrements of the related Siberian nelma, are larger in female 

 than in male specimens. The belorybitsa measured by Smitt 

 was a male which thus may explain the diflPerences in this 

 respect. The postabdominal length is smaller in my specimen 

 than in Smitt's which it ought not to be, but the latter spe- 



^ But as it had löst the greater part of its scales and I still hoped to 

 get new and better specimens it was not preserved. 



