312 Bulletin 47, United States National Museum. 



elevated, caudal peduncle compressed ; head moderate, snout broad, 

 gently decurved; mouth broad, inferior, oblique; interorbital -width 

 equals length of snout. Fins not falcate; insertion of dorsal slightly 

 behind ventrals, about midway between base of middle caudal rays and 

 pupil; height of dorsal and anal about equal, 1^ in head; caudal not 

 deeply forked. Lateral line often, but not always, incomplete. Color 

 grayish, with scattered dark spots or blotches ; faint dark lateral band 

 extending forward through eye and around snout ; dorsal and anal fins 

 with some dark markings; other fins plain. Length 4 inches. Upper 

 Snake Iviver liasin to Heart Lake in Yellowstone Park, thence extending 

 southward in the Great Basin to Utah Lake ; very abundant and extremely 

 variable. To this form we also refer provisionally specimens from Lake 

 Tahoe and elsewhere in the Lahontan basin, and also those from various 

 coastwise localities in central and southern California, where it is 

 abundant in clear streams and springs as far south as San Luis Obispo. 

 These California and Nevada forms may be distinct species, but if so, we 

 are unable to define them. (Named for Campbell Carrington, naturalist 

 of the Hayden Survey in Utah and Idaho.) 



Apocope carringtonii, CoPE, Hayden's Fifth Annual Report U. S. Geological Survey, 1871, (1872), 



472, Warm Springs, [Box Elder County], Utah. (Coll. Campbell Carrington.) Cope 



& Yaruow, Zoiil. Wheeler Survey, C45, 1875, (1876). 

 Apocope vulnerata, Cope, /. c, 473, Logan, Utah. (Type, No. 15768. Coll. Henshaw.) Cope 



& Yarrow, Zoiil. Wheeler Surv., G4G, 1875, (1876). 

 Tigoma rhinichthyuides, Cope, I. c, 473, Logan, Utah. (Coll. Carrington.) 

 Bhinichlhys hensharii, CoPE, Proc. Amer. Philos. Soc. Phila., 1874, 133, Prove, Utah; Plagop. 



Ichth. Utiih, 7, 1874. 

 Agosia novemradiata, Cope, Proc. Ac. Nat. Sci. Phila., 1883, 141, Weber River at Echo, Utah. 

 Ceratichlhys mibilns. Cope, Hayden's Fifth Annual Report U. S. Geol. Surv. 1871, (1872), 472. 

 Apocope henshavii. Cope & Yarrow, Zoiil. Wheeler Surv., 645, 1875, (1876). 

 Apocope carringtoni and vulnerata, Jordan & Hensuaw, Report Chief Engineers, U. S. Geol. Surv. 



W. 100th Mcr., 191, 1878. 

 Apocope carringtoni, vtihterata, and henshavii, Jordan & Gilbert, Synopsis, 210, 1883. 

 Agosia nuhila, Jordan, Bull. U. S. Fish Comm., ix, 1889, (1891), 32 and 48. 

 Agosia rMhila carringtonii, Gilbert & Evermann, Investigations in Columbia River Basin ,41, 1894. 



516. AGOSIA VELIFERA (Gilbert). 



Head 4; depth 4f ; eye 3. D. 8; A. 7; lateral line with 56 pores; 10 

 scales between lateral line and dorsal ; teeth 2, 4-4, 2, hooked. Upper 

 lip as in J. i/arrotci with a narrow frenum, thus indicating a transition 

 toward RMnichihys. Snout narrow, bluntly rounded, not projecting 

 beyond premaxillaries. Mouth small, horizontal, the maxillary equal to 

 eye, reaching front of eye, 3^ in head. Pectorals nearly reaching base of 

 ventrals, the latter beyond front of anal; origin of dorsal behind ventrals, 

 midway between base of caudal and middle of eye, the fin unusually high ; 

 caudal lobes more pointed than usual. Brown ; a black lateral band and 

 a small black caudal spot. Three specimens from a hot spring in Pahran- 

 agat Valley, southwestern Nevada, (velum, sail; fero, T bear.) 



Rhiuichlhi/s (Apocope) velifer, Gilbert, Death Valley Expedition, 229, pi. vi, tig. 2, 1893, Pah- 

 ranagat Valley, Nevada. (Coll. Merriam & Bailey.) 



