FISHES, LAHONTAN SYSTEM OF NEVADA AND NORTHEASTERN CALIFORNIA. 73 

 Number of Spots on Trouts from Different Localities. 



Locality 



Length of specimen mm 



Spots on head 



Body above line 



Body below line 



Tail above line 



Tail below line 



Dorsal fin 



Adipose fin 



Caudal 



Anal 



I^ake Tahoe. 



Truckee River. 



Redfish. 



Tommy. 



Pyramid Lake. 



5S 

 95 

 113 

 43 

 59 

 36 

 3 

 66 



38 



67s 



60 

 103 

 S3 

 45 

 44 

 43 

 5 

 93 



16 



ICX) 



45 

 48 

 35 

 86 

 4 

 334 



44 

 49 

 39 

 31 



103 

 5 



38.1 



25 



US 

 ITS 

 63 

 57 

 55 

 a 

 14s 

 23 



68 

 92 



1 59 

 59 

 82 

 45 

 4 



162 

 16 



13 



43 

 o 



40 

 7 



41 

 4 



95 



17 



The native trout seen elsevfhere in the Lahontan system belong to this species. Those of the 

 Humboldt, Carson, and Walker Rivers are lighter in color than fishes from Lake Tahoe. Like other 

 trout they are darker in deep, shaded water and lighter and more silver}' in the open rivers. Large 

 trout of this species are foimd in the upper part of Walker Lake, where the water is comparatively fresh. 



S. hcnshawi is a more slender trout than the rainbow. The head is longer and more pointed, and 

 in some cases the body is very elongate. 



Measurements op Freshly Killed Specimen. 



Total length inches. . 



Depth do 



Depth caudal peduncle do. . . . 



Length head do 



Weight pounds. . 



3'i 

 iH 

 4 

 a!4 



In addition to the above, the following measurements and weights may be of interest. 

 were taken in Pyramid and Winnemucca Lakes. 



The fishes 



In this species the basibranchials bear teeth which are generally numerous and large. Occa- 

 sionally specimens will be found in which the teeth are few and frail or entirely absent. Many ex- 

 amples observed at the Truckee Dam at Thisbe were without exception supplied with basibranchial 

 teeth. At another time 20 individuals examined at the same place produced 6 examples without such 

 teeth. An occasional specimen taken in Pyramid and Winnemucca Lakes had none, the number 

 running about i to 10. It here appeared probable that teeth are more often absent in larger individuals, 

 those over 500 millimeters in length, than in the smaller ones. The gillrakers usually number from 

 23 to 25. The branchiostegals number 10 or 11, often 12, rarely 9. 



There are from 70 to 85 caeca present. There are usually from 153 to 163 scales in the lateral series 

 sometimes as few as 150 or as many as 170; 29 to 39 above the lateral line. 



