48 



BULLETIN OF THE BUREAU OF FISHERIES. 



has been taken in the Oregon Lake region, the other, if such really existed, having been unable to 

 maintain itself in the very restricted and reduced basins of which the system is now composed. It 

 seems that C. warnerensis and C. arenarius are probably related, both belonging with the coarse-scaled 

 series. 



The following description is of the type, no. 75654, United States National Museum, a male specimen 

 measuring 330 millimeters, collected at the Willows, Pyramid Lake, Nev., May 20, 1913. (Fig. i.) 



Head 4.1 in length to base of caudal; depth 4.9; depth caudal peduncle 11. 5; snout 2.1 in head; 

 eye 7.2; interorbital space 2.5; width of mouth 4.2; scales lateral series 75; between lateral line and 

 back 15; between lateral line and base of ventral 12 ; between occiput and dorsal 26. 



Mouth large, the lips broad and full; 6 or 7 rows of papillae on upper lip, about Son the lower. Eye 

 nearer edge of opercle than tip of snout. The dorsal foramen of the skull is broad and long. Body 

 completely scaled, the scales being nowhere unusually small or densely crowded; those on anterior 

 part of breast deeply embedded and not easily distinguished. Edge of dorsal fin straight. Ventrals 

 inserted below middle of dorsal. Pectorals, ventrals, and anal broadly rounded. 



Color in life, olive above, light yellowish brown on thesides, silvery suffused with pink on the ventral 

 surface, back, and sides with metallic reflections; a bright red lateral stripe of irregular width and with 



Fig. t.~Catostomus arenarius. Type. Sand-bar sucker. 



indefinite edges extends from opercle to tip of tail ; tubercles on anal and lower half of caudal dead white. 

 In spirits all trace of the bright color disappears; the dorsal parts become blue-black, then brown, the 

 ventral region white or yellowish. 



The females are less brightly colored in life, the body lacking much of the metallic sheen, and the 

 lateral stripe being but faintly indicated. On attaining large size the body becomes stocky and the 

 head appears morerounded. The largest specimen seen measured 20 inches in length and weighed 2>^ 

 pounds. 



The first example of this species was seen in the lower Truckee River, where it was picked out from a 

 number of "cui-ui" and red suckers caught by the Indians. They called it "au-wa-go," not distin- 

 guishing between it and the red sucker, C tahoensis. It was later caught in Fallen Leaf Creek near 

 Lake Tahoe and in the Humboldt River. It was finally observed spawning in Pyramid Lake, May 20. 

 The eggs were being deposited deep in the coarser sand and gravel of the bars near shore. Numerous 

 minnows were in attendance struggling with one another for the eggs. After June i no suckers were 

 spawning and none was seen near shore. 



One large example of this species was found in the collection of the National Museum among some 

 specimens of Caiosiomus tahoensis which had been collected long ago by H. W. Henshaw at Lake Tahoe." 



o Caiosiomus tahoensis first appears in Bulletin 12, United States National Museum. 1878. p. 173. where a brief diagnosis is 

 given, and a specimen collected by J. G. Cooper is designated as the type. Examples collected by Henshaw are also mentioned. 

 A description and figures appear later (Report Chief Engineers. 1S78. pt. 3, p. 1610), where the specimens collected by Henshaw 

 are referred to as the types. However, the figures accompanying this description are of one of the examples collected by Cooper, 

 and which was first designated as the type. It is fortunate that the latter is preserved (type no. 5240). for an examination of 

 Henshaw's specimens reveals the presence of two species, one of which, a relatively fine-scaled form, is represented by Cooper's 

 specimen. The latter measures 298 millimeters in length. There are 92 scales in the lateral series, 16 between the lateral line 

 and the back and 50 between the occiput and dorsal fin. The name tahoensis may without doubt therefore be applied to the 

 fine-scaled form. 



