50 



BULLETIN OF THE BUREAU OP FISHERIES. 



This species appears in schools along with Catostomus, small examples of the latter being easily dis- 

 tinguished in the water by the large dark spots on the sides. It usually appears in small numbers 

 in the lower courses of the streams, but is often more abundant where the ciurent is swift. Individuals 

 do not appear to reach a large size; no specimen over 6 inches in length was seen. None was foimd in 

 the lakes. 



Small suckers which may belong to this species were reported from Pine Creek, which flows into 

 Eagle Lake. None was seen at the time of the writer*s visit. 



Measurements of Pantosteus lahontan, HuMsotDT River, Palisade. 



Length of body mm 



Length head 



Depth body 



Depth caudal peduncle 



Length caudal peduncle 



Length snout 



Diameter eye 



Interorbital width 



Depth head 



Snout to occiput 



Snout to dorsal 



Snout to ventral 



Length base of dorsal 



Length base of anal 



Height dorsal 



Height anal 



Length pectoral 



Length ventral 



X^ength caudal 



Dorsal rays 



Anal rays 



Scalps lateral line 



Scales above lateral line 



Scales below lateral line 



Scales before dorsal 



O. 23 

 ■ 16 

 .08 

 .16 



.IIS 



.04 



■075 



■■3 



. 30 



■50 



■565 



.14 



.065 



.16 



. 20 



.iS 



•15 



7 

 80 

 16 



Chasmistes cujus Cope. "Cui-ui." 



Nothing seems to have been added to the brief original description of this species given by Cope," 

 and until now but one specimen, the type, was preserved in any museum. Its distribution is restricted 

 to Pyramid and Winnemucca Lakes, where it lives in deep water beyond the reach of ocular observation, 

 except during the brief spawning period, when a migration is made for a short distance up the Truckee 

 River. 



The annual run begins about April 15, varying somewhat of late years with the condition of the river. 

 The season of 1913 afforded an unusually good opportunity for observation, as the water was compara- 

 tively low and clear, while during the entire spring a reasonably steady flow into both Pyramid and 

 Winnemucca Lakes was maintained. 



The first " cui-ui " appeared in the river April 13, when several schools passed up rather hastily and 

 lodged in pools below an impassible irrigation dam. This preliminary wave having passed, none was 

 seen again until on the morning of April 22, when schools of 20, 30, or even 50 or more individuals were 

 observed moving slowly and steadily upstream. It was customary for them to congregate and lie for a 

 while below a rapid place, tlien suddenly and speedily shoot up, singly or in pairs or in small straggling 

 schools, their brilliant red and brassy sides flashing in the bright simshine. None of these stopped to 



o Proceedings, Academy Natural Sciences, Philadelphia, 1883, p. 149: 



Cope spelled the Piute name of the species Couia, and it has been thus known to recent authors. The white residents pro- 

 notmcc it kwec-wee. Both the latter and Cope's name are corruptions of the Indian name "^Cui-ui " (pronoimced Kouic-wee). 



Fowler holds that Lipomyzon, Cope, 1879 (breviroitris) should be used instead of Chasmistes (Jordan. 1879) (Proceedings, 

 Academy Natural Science, Philadelphia, 1914. p. 53). It will be found, however, that Dr. Jordan (Bulletin, Geological Survey. 

 Haydcn. vol. IV, 1878, p. 417) fully, or at least sufficiently diagnosed the genus Chasmistes as follows; " This genus is distinguished 

 from Catostomus by the very large terminal mouth, the lower jaw being very strong, oblique, its length about one-third that of 

 bead. The lips in Chasmistes are little developed and are very nearly smooth." 



Dr. Jordan wrongly supposed that the specimens from which he described Chasmistes were representatives of Catostomus 

 fecundus Cope and Yarrow, the type of which he had not then seen, and which, as he later determined, is a true Catostomus. 

 Under the circumstances it seems to be of secondary importance that C. fecundus, the name wrongly applied, was first designated 

 83 the type. (Bulletin, United States National Museum, no. 13, 1878, p. 319.) 



