56 BULLETIN OF THE BUREAU OF FISHERIES. 



yellowish stripe, and below which the sides are covered with spots more or less definitely arranged in 

 stripes." 



During the nuptial migration of Catostomus, before noted, large numbers of this species followed 

 the female suckers, feeding on the eggs. Many eggs were found in the stomachs of the minnows. Neither 

 male nor female spawning suckers objected to the presence of the minnows, the latter swarming about 

 and at times darting over and under them. 



Many examples were caught with hook and line in Lake Tahoe. None of these exhibited bright 

 colors, although taken at the time when others of the species were spawning in the streams near by. On 

 dissection the ovaries of some of these were found to contain large eggs, although in most cases they were 

 immature. Females here far outnumbered the males. 



On May 14 specimens in nuptial colors and nearly ripe eggs were secured in the Truckee River near 

 Pyramid Lake. Examples taken at the same place April 24 had only traces of red color. Specimens 

 from the Humboldt River collected after July i had spawned. These were generally lighter in color 

 than those of the Tahoe region, as were also examples from Carson and Walker Rivers. 



A few specimens taken August 1 1 in Walker River near the outlet contained large numbers of almost 

 fully developed eggs. Some rather brightly colored males were found there at the same time. 



The teeth of 20 specimens were examined, and in general they numbered 2-4 on the right side, 

 2-5 on the left. Variations of 1-4 and 1-5 were observed, and in one example an extra row of 2 teeth 

 appeared on one side, making 3 rows in all. The teeth of the outer row are strongly hooked, and when 

 a grinding surface appears it is very narrow and indistinct. The alimentary canal is S-shaped and very 



l?ic. 3. — Richardsonius et/regius. Red^striped shiner. 



short. The gillrakers number 8 or 9, occasionally 7; of these, 5 or 6 are on the lower arch. They are 

 very short and for the most part sharply pointed. The peritoneum is silvery, immaculate on tlie belly, 

 generally covered with blackish spots on the sides and above. The spots are more numerous and the 

 effect darker in specimens from the mountain streams, while in examples from the sandy rivers of the 

 desert they are less numerous and the color effect decidedly lighter. Individuals show much variation 

 in the size, shape, and number of pigment spots. The edges of the dorsal and anal are straight or slightly 

 concave. The caudal is large and deeply cleft, especially in male examples. 



a Richardsonius balleatus is a species which exhibits a range and variety of coloration similar to that of R, egregius, and seem- 

 ingly a lack of appreciation of this is what led Evcrmann and Cockercll (Proceedings, Biolographical Society, Washington, xxn, 

 1909, p. 18s) to the conclusion that examples of R. balteatus from Warm Springs, Oreg., represented a new form which they name 

 R. thermophilus. 



The warm springs from which the locality gets its name flow into a marsh, where water of an even temperature is maintained 

 throughout the year. Silver Creek drains this marsh. The water" is full of algfe and at times swarms with minute Crustacea 

 and the larvje of insects. Many large, well-fed, fat fishes collected here belonged to three genera of minnows, and they were 

 much alike in color and form, differing in the same way from other specimens of like species taken at various places in Silver 

 Creek, just as trout from a deep, shaded pool differ from those living in a shallow, sandy stream. The specimens of R. balteatus 

 found here and in other parts of Silver Creek possess certain characteristics of a local nature, as do other examples of the species 

 from particular parts of its very wide range, but although attempts have been made to coordinate these local variations with 

 reasonable geographic distribution no success has been achieved. 



The description of R. thermophilus mentions no distinctive characters and contains nothing more than had been previously 

 pubUshed regarding the specimens upon which the species is based, save a figure of an enlarged scale. This differs in no way 

 from others of L, balteatus from various places in the Columbia Basin. 



