% 



ADDENDA 31. CYPRINID^ RHINICHTHYS. 885 



are recognized. These are distinguislied by the cliaracters given iu 

 tlie following analytical key: 



a. Mouth inferior, snout jiroduced beyond it. 



b. First dorsal ray midway between end of snout and base of caudal. 



c. Lateral line 60-64; 1. trans. 10 + 1 +y nasitfiis. 



cc. Lateral line 70 vataructa. 



J)h. First dorsal ray midway between anterior nostril and base of caudal. 



d. Lat. 1. 75-80 ; 1. trans. 10 + 1-1-10 marmoratiis. 



(id. Lat. 1. 70; 1. trans. 10 + 1 + 10 hitem. 



hhb. First dtu'sal ray midway between front of mouth and base of caudal. 



€. Lat. 1. 70 ; 1. trans. 11 + 1 + 10 ; snout narrow occUa. 



ee. Lat. 1.80; 1. trans. 12 + 1 + 12 ditlcls. 



ecc. Lat. 1. 70-72 ; 1. trans. 12 + 1 + 13 trannmontanwa. 



hhhh. First dorsal midway between middle of eye and base of caudal. 



/. L. trans. 25 maxiUosus. 



ua. Mouth subinferior, snout not produced. 



g. First dorsal midway between nostril and base of caudal; lat. 1. 80; 



1. trans. 14 + 1 + 10 hadim. 



g(j. First dorsal midway from eye. 



h. Lat. 1. 58-60 ; 1. trans. 9 + 1 + 7 slin hs. 



7i7i. Lat. 1. 70; 1. trans. 11 + 1 + 8 ohinsiis. 



hlih. Lat. 1. 63; 1. trans. 12 + 1 + 9 aironasm. 



i. Stout, black baud obsolete hoiatuK. 



aaa. Mouth anterior. 



fc. First dorsal midway from front of eye. 



I. Lat. 1. 69-76 ; 1. trans. 11 + 1 + 10 mplcagris. 



II. Lat. 1. 64 ; 1. trans. 9 + 1 + 7 arcnatm. 



Most of these species we are unable to recognize. They seem to us 

 to be merely local varieties, or even individual variations, of the tAvo or 

 three most widely-distributed types in this genus. 



The following may i)erhaps be inserted: 



Page 207. After R. transmontanus add: 



316 (&). R. dulcis (Grd.) Jor. & Copcl. 



Eeddish brown, clouded with darker; lateral band very faint; a 

 dark caudal spot. Snout blunt, projecting beyond mouth, which is 

 small and inferior. Barbel small, sometimes absent. Ventrals reach- 

 ing vent. Scales small. Head 41. D.J); A. 8; scales 12-80-12. Platte 

 Valley. {Garman.) 



{Arfjijreus dulcis Grd. Proc. Acad. Nat. Sci. Phila. 1856, Sweetwater River; Gar- 

 man, Science Observer, 1881, 59, Cheyenne: Ehinichlhi/s ocella Garman, 1. c. 59, from 

 N. E. Wyoming and Montana, has the snout narrow, the barbel conspicuous, the 

 scales 11-70-10: lihiniclitlnjs htteiis Garman, Hull. Mus. Comp. Zool. 1881, 87, and 

 Science Observer, 1881, 59, from Oj;"den, Utah, has the snout long, more than twice 

 eye, the barbel small, and the scales 10-70-10: Khinichthiis mar moral 11.1 Ajjj. ; Garman, 

 1. c. 58, from Sault Ste. Marie, has the scales 10-78-10, and is possibly distinct from 

 E. cataractw.) 



