Jordan and Rvermann. Fishes of North America. 323 



A'<y///(s ni'brascensis, GiRARD, Proc. Ac. Nat. Sci. Phila., 1856, 190, Sweetwater River, 

 Nebraska, (Coll. Bowman.) 



A*<V,(,,/N l>tllK-u*, GIRARD, Z. c., 213, 185G, Black Warrior River. (Coll. Winchell.) 



(V/-,,/iV/,M//.s leptocephalus, GIRARD, Proc. Ac. Nat. Sci. Phila., 185C, 213, Salem, North Carolina. 



CeratichllHj* ci/dotis, COPE, Proc. Ac. Nat. Sci. Phila., 1864, 277, Grosse Isle, Waterford, Clin- 

 ton River, and Bruce, Michigan; GCNTIIER, Cat., vn, 178, 1868. 



Ci'rafictttiiy* wiVroyw/on, COPE, Proc. Ac. Nat. Sci. Phila., 1864, 277, Conestoga River, Penn- 

 sylvania. (Coll. Jacob Stauffer.) 



Ceratichlliy* sttijmxtiais, COPE, 1. c., 278, 1864, Michigan; GUNTHER, Cat., vn, 179, 1868. 



(Vm/iV/,%.s biguttiitus, COPE, Cypr. Pcnn., 366, 1866; GUNTHER, Cat., vu, 178, 1868. 



Ceratichthys biguttatus and C. micropogon, JORDAN & GILBERT, Synopsis, 212, 1883. 



131. COUESIUS, Jordan. 



Couesiiis, JORDAN, Bull. Hayden's Geol. Surv. Terr., iv, 785, 1878, (milneri). 



Body elongate. Head normal, not depressed, the profile convex. Mouth 

 terminal, normal, a well-developed barbel on the anterior side of maxil- 

 lary, just above its tip. Teeth 2, 4-4, 2, hooked, without grinding sur- 

 face. Scales rather small; lateral line continuous. Dorsal fin over or 

 slightly behind ventrals ; anal basis short. Size rather large. This genus 

 is closely related to the section Nocomis under Hybopsis, from which it 

 may be separated by the presence of 2 teeth in the lesser row, by the posi- 

 tion of the barbel, and by the smaller scales. Its relations with Semotilus 

 are equally close. The species are not well known. (Named, for Dr. 

 Elliott Coues, the most versatile and most inspiring writer on American 

 ornithology, (1842 ) who collected the- type species in large numbers.) 



a. Scales in a cross series from dorsal to lateral line about 17; 66 in the lateral Hue. 



SQUAMILENTUS, 537. 



aa. Scales in a cross series from dorsal to lateral line 10 to 13. 

 6. Scales in the lateral line 63 to 72. 



c. Free margin of dorsal fin concave, the anterior rays extending beyond the last rays 



when the fin is depressed. PLUMBEUS, 538. 



cc. Free margin of dorsal not concave, the tips of the anterior rays not reaching tips 



of last rays when the ftn is depressed. PISSIMILIS, 539. 



66. Scales in the lateral line 55 to 58. 



d. Scales before dorsal about 36. GREENI, 540. 



dd. Scales before dorsal about 27. ADUSTUS, 541. 



537. COUESIUS SQUAMILENTUS (Cope). 



Head 3f ; depth 5 ; eye 4. D. 8 ; A. 7; scales 17-66-14 ; teeth 2, 4-4, 1. 

 Form stout, the profile nearly plane; muzzle not prominent. Mouth hori- 

 zontal, the maxillary not reaching orbit ; eye rather small, shorter than 

 snout. Isthmus wide. Barbel quite small. Dorsal fin slightly in advance 

 of ventrals, behind iniddleof body. Scales quite small. Olivaceous above ; 

 sides silvery ; a lateral band of dark punctulations ; fins plain. Henry's 

 Fork of Green River in southwestern Wyoming. (Cope.) Perhaps not 

 distinct from C. dixsimilis, but the scales in transverse series said to be 

 much more numerous, (squamilentus, small -scaled.) 



Ceratichthys sijnamileiitut, COPE, Haydeu's Geol. Surv. Wyom., 1870, (1871), 442, Henry Fork 



of Green River, 'Wyoming. Colorado basin. 

 Conesius squamilentus, JORDAN & GILBERT, Synopsis, 218, 1883. 



538. COUESIUS PLUMBEUS (Agassis). 



Head4i; depth ^i; eye 4. D. 8; A. 8; scales 11-60 to 70-7; teeth 2, 4-4, 2. 

 Form of Semotilus atromaculatus, but more elongate and less compressed. 



