EEPORT OF COMMISSIONER OF FISH AND FISHERIES. [28] 



320 c. Hhhiichthys cataracicB transmonlanus Cope. R. (315) 



321. Rhinichthys atronasus Mitchill. Vn. (:51.6, 317) 



86.— AGOSIA Girarcl. (90) 

 § Agosia. 



322. Agosia chrysogaster Girard. R. (318) 



323. Agosia metallica Girard. R. (319) 



324. Agosia novemradiata' Cope. R. 



^ Apocope Cope. (91) 



325. Agosia carringtoni Cope. R. (3i0) 



326. Agosia nubila- Girard. R. (321,322,323,324) 



327. Agosiaoscula' Girard. R. (325) 



87.— HYBOPSIS^ Agassiz (92) 

 § Nocomin Girard. 



328. Hybopsis biguttatus'' Kirtland. V. (325,327) 



^ Hybopais. 



329. Hybopsis cumingi Giiuther. T. ? (329) 



330. Hybopsis storerianus"^ Kirtland. Vvv. (330) 



recognized. B. fransmontanus represents a tangible variety, occurring vrest of the 

 Rocky Mountains and having a greater number of scales below the lateral line than 

 I have ever seen in J?, cataractcr. Bh. dulch has the snout shorter and blunter than 

 usual in cataractw, projecting little beyond the mouth. Carman's review of this genus 

 (Science Observer, 1881, 57) seems to me worse than useless. 



^Agosia iiovemradiata Cope, Proc. Ac. Nat. Sci. Phila., 1883, 141. Silvery, dusted 

 with smoky above and marked on sides with several rows of dusky spots; bases of 

 lower fins and upper lip red; head elongate, especially the muzzle, which projects 

 a little; eye 4* in head, U in muzzle, and in interorbital Avidth ; dorsal inserted be- 

 hind ventrals : caudal ])eduucle rather deep ; head 4 ; depth 5 : D. always 1, 9 ; A. 1, 

 7; scales ll-nO-ll. Weber River, at Echo, Utah. {Cope.) 



2 On comparison of many examples, including the original types of Apocope nubila, 

 rulnerata, and henshavii, I am unable to appreciate any permanent specific distinctions. 

 The genus Apocope is scarcely distinct from Agoma. 



•' Argyreus osculus Girard = Argyreus notahilis Girard = Apocope ventricosa Cope. This 

 species differs from A. nubila chiefly in the much smaller size of the scales. The orig. 

 inal type of A. oscuhis has 90 scales in the lateral line, which is nearly complete. 



< There is little doubt of the identity of Hxjbopsis gracilis Agassiz with Ceratichthys 

 amblops. The name Hybopsis is therefore prior both to Nocomis and Ceratichthys as the 

 designation of this genus. 



6 Ceratichthys micropogon Cope is i>robably based on an abnormal individual of H. 

 biguttafus. 



^Rutilus storerianus Kivt\aTid= Ceratichthys lucens Jordan. By a curious mistake, 

 Kirtland's species has been confounded by several recent writers with Kotropis amarus, 

 a species similar in appearance but lacking barbels. This handsome species reaches 

 a length of 10 inches and is abundant in the lakes and river channels of the Missis- 

 sippi Valley and the lake region. The teeth are usually 1, 4-4, 0. 



