Jordan and Evermann. — Fishes of N'orth America. 2795 



narrowly triangular at the tip when viewed from behind, densely tufted 

 on the anterior edge; fontanel narrow, its length 21 in the snout, its 

 width about \ its length. Fins all large; the origin of the dorsal a little 

 nearer tip of snout than base of caudal, the sixth ray over base of ventral, 

 its base 1? in head, the free edge nearly straight, the last ray 1| in the 

 first, which is 1.V in head; pectorals scarcely falcate, reaching a little 

 more than f distance to base of ventrals, their length 1:^^ in head ; ventrals 

 long, reaching veut, the rays gradually iucreasing in length from the 

 outer to the seventh and eighth, which are longest, the ninth and tenth 

 being but slightly shorter, the length of the longest ray 1* in head or 

 about ), longer than the first; anal long and poiuted, the fourth ray 

 longest, reaching base of caudal, 1,; in head; each ray of anal fin with 

 8 to 12 strong tubercles; caudal lobes about equal, their length IJ times 

 the middle ray. Length a foot or more. Upper Klamath Lake, Oregon, 

 where it m abundant and of some importance as a food-fish. The Klamath 

 Indian name is K-ahp-tu. {drofiiai, large-mouthed.) 



Chasmistes atomias, Gilbert, Bull. U. S. Fish Comm. 1897 (Jan. 6, 1898), 5, with plate, Upper 

 Klamath Lake, Oregon (Tj'pe, No. 48223. Coll. Gilbert, Cramer & Otaki) ; Ever- 

 MANN & Meek, Bull. U. S. Fish Comm. 1897, 70. 



297(b), CHASMISTES tOPEI, Evermann & Meek. 



HeadSf; depth 4; eyetJi; snout 2.V; maxillary (measured from free end 

 to tip of snout) 3; mandible2*. 1). II, 10; A. I, 7; scales 13-80-12; inter- 

 orbital width 2^; vertical depth of head at mandibular articulation 2i, 

 Head large, cheek very deep, the depth equal to distance from tip of 

 snout to nostril; body stout, back scarcely elevated, caudal peduncle 

 rather short and stout; ventral surface somewhat convex. Premaxillary 

 spines less protruding than in C. stomias, not forming a prominent hump; 

 mouth large, inclined upward at an angle of 45°, maxillary not nearly 

 reaching vertical at front of anterior nostril; width of mouth 1* in snout, 

 or 4 in head; upper lij) thin, witliout papilhe ; lower lip thin, entirely 

 without papillic, interrupted at symphysis, forming rather broad lateral 

 lobes; pores on head very conspicuous; gill rakers larger than in C. 

 stomias, broadly triangular at tip when viewed from behind, densely 

 tufted on anterior edge, each appendage more or less bifid and club- 

 shaped, closely resembling those of C. Hon<K; fontanel narrow, its length 

 24 in snout, width } its length. Fins all small; origin of dorsal a little 

 nearer snout than base of caudal, its sixth ray over base of ventrals, free 

 edge straight, base 2| in head, last ray a little less than 2 in first, which 

 is 2 in head; pectorals somewhat falcate, reaching slightly more than 

 ^ distance to ventrals, their length If in head; ventrals very short, 

 reaching only | distance to vent, free end nearly straight; outer ray lon- 

 gest, 2f in head ; inner shortest, 3:1 in head ; anal fin short, bluntly poiuted, 

 not reaching base of caudal, third and fourth rays longest, 1| in head; 

 no tubercles on anal rays; caudal lobes e(£ual, length about 1| times the 

 middle ray. Scales small and crowded anteriorly, abOTit 14 rows down- 

 ward and backward from front of dorsal to later.il line, 11 vertically 

 upward from base of ventral to lateral line, about 38 oblique series before 



