308 Bulletin 47, United States National Museum. 



Represented in the Tennessee Basin by 



609a. RHINICHTHYS ATRONASUS CROCEUS (Storer). 



Head 4; depth 4i; eye 5. D. 7; A. 6; scales 70; teeth 2, 4-4, 2. Very 

 similar to R. atronasus, but usually rather stouter, the scales smaller, the 

 barbel more distinct, the head a little shorter, the upper jaw more pro- 

 jecting, and the coloration somewhat different. Back olivaceous, much 

 mottled with darker ; sides with a rather faint brownish band, margined 

 above and below with creamy yellowish ; a dusky blotch in the middle of 

 the base of the dorsal fin ; males with the pectoral fins enlarged, and with 

 the lateral band rosy. Length 3 inches. Tennessee Basin ; abunjdant in 

 clear brooks, (croceus, saffron color.) 

 Leuciscus croceu*, STORER, Proc. Bost. Soc. Nat. Hist., July, 1845, 48, Florence, Alabama. 



(Coll. Chas. A. Hentz.) 

 RhinichthysoUusus, AGASSIZ, Amer. Journ. Sci. Arts, 1854, 357, Huntsville, Alabama ; GUNTHER, 



Cat., vn, 190, 1868 ; JORDAN & GILBERT, Synopsis, 208, 1883. 

 Bhmichthysbadius, GARMAN, Science Observer, 1881, 60; "Scales 14-80-10," Clinch River. 



Replaced northwestward by 



609b. RHINICHTHYS ATRONASUS LUNATUS (Cope). 



Much like var. croceus, the coloration mottled, the lateral band obsolete, 

 the mouth more inferior, with shorter and wider cleft. Eye 5 in head ; 

 depth 5 in length. Insertion of dorsal midway between nostril and base 

 of caudal. Scales 62. The common form in the lakes and brooks of Michi- 

 gan and Indiana, and probably of Wisconsin and Minnesota, also. 



Rhinichthys lunatus, COPE, Proc. Ac. Nat. Sci. Phila., 1864, 278, Grosse Isle, Michigan. (Coll. 



Prof. Fox.) 

 Rhinichthys arenatus, GARMAN, Science Observer, 1881, 62, Sand Hill River, Minnesota. 



Represented in the prairie streams by 



509c. RHINICHTHTS ATRONASUS MELEAGRIS (Agassiz.) 



Similar to subspecies croceus, but the jaws nearly equal. Head broad, 

 narrowed anteriorly. Scales 11-70-8. Illinois and Iowa, perhaps indis- 

 tinguishable from lunatus. (meleagris, generic name of the turkey, from 

 its color?) 



Rhinickthys meleagris, AGASSIZ, Amer. Journ. Sci. Arts, 1854, 357, Burlington, Iowa. (Coll. 

 Dr. Rausch.) JORDAN & GILBERT, Synopsis, 886, 1883. 



129. AGOSIA, Girard. 



Agosia, GlRARD, Proc. Ac. Nat. Sci. Phila., 1856, 186, (chrysogasler). 

 Apocope, COPE, Hayden's Geol. Surv. Mont, for 1871, 472, 1872, (carringtoni). 

 Erilrema, COPE, Zool. Wkeeler's, Geol. Surv. W. 100th Mer., v, 648, 1876, (henshavii). 

 Zophendum, JORDAN, Bull. Hayden's Geol. Surv. Terr., iv, 1878, 786, (siderium). 



This genus differs from Bhinichthys only in having the premaxillaries 

 protractile. Even this character shows a disposition to disappear by 

 degrees, as many specimens of Agosia yarroivi possess a narrow frenum, 

 which, however, is distinct from the very broad frenum of EhinicJithys. 

 In form, appearance, and habits the two groups agree perfectly, all the 

 species inhabiting mountain streams and springs. Rocky Mountain region. 

 (A coined name without meaning.) 



