426 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



Origin of dorsal nearer tip of snont than base of caudal by a 

 distance equal to length of maxillary ; edge of fin concave ; first ray 

 highest, the length contained 1^ times in head. Adipose fin of 

 enormous size, the length of its base equal to that of anal fin; the 

 height contained 2h times in the length of its base. Anal inserted 

 opposite the adipose fin, the posterior ends of their bases being on 

 the same vertical line; height of longest (first) ray contained 1§ 

 times in the head. Pectoral sharply pointed, the length contained 

 If times in the head. Origin of ventrals below middle of dorsal, 

 their length equal to highest dorsal ray. Caudal deeply notched, the 

 lobes rounded I3 in head. 



Color silvery, somewhat dusky above; edges of fins dusky. 



Described from the type. Cat. No. G2!)87, U.S.N.M., a female speci- 

 men 480 nun. long, the largest specimen known, from the McKenzie 

 River, Oregon, collected by Mr. A. C. Bassett, of Menlo Park, Cali- 

 fornia. Many others, including the cotypes. Cat. Xo. -21140, Stan- 

 ford University collection, were sent by II. C. MacAllister, head fish 

 warden of the State of Oregon. The figure of the type, a female as 

 above indicated, is drawn by Mr. William S. Atkinson. 



Females ready to spawn, others with the eggs considerably smaller, 

 and males with the rejjroductive organs greatly developed, are at 

 hand. A male specimen has the body covered with tubercles, one on 

 each scale. The snout appears to increase in length and become 

 prominent with age. Its great length is not a character peculiar to 

 either sex, nor is it an indication of sexual maturity. Small indi- 

 viduals (measuring about 250 mm.), both nuiles and females, sex- 

 ually mature, have relatively short snouts. The adipose dorsal is 

 relatively larger in older specimens, but even in very small examples 

 its base is nearly equal to that of the anal fin, and it is much higher 

 than any other whitefish. The young of this species have large dark 

 spots on the upper surface, and a series of short, bi'oad, vertical bars 

 along the lateral line. 



The following is a table of proportional uieasurements: 



Length (to base of caiulal) iu niillimeters__ 425 384 340 248 226 



Length head, in hundredths of length .25 .245 .225 .225 .215 



Depth caudal peduncle .002 .00 .002 . 0.'')2 .050 



Length snout .005 .08 .075 .074 .062 



Tip of snout to end of maxillary .085 .08 .072 .07 .06 



Snout to occiput . 1!) .195 .175 .17 .105 



Length base adipose tin .13 .12 .12 .115 .105 



Height of adipose fin .00 .045 .055 .05 .055 



Dorsal rays 12 13 13 13 12 



Anal rays 12 12 12 12 11 



Scales in the lateral line 80 81 85 85 84 



For several summers Mr. A. C. Bassett, of Menlo Park, California, 

 has visited the McKenzie River, in central Oregon, and has reported 



