310 Bulletin 47, United States National Museum. 



pectoral \\ in head, usually not quite reaching ventrals, the latter reach- 

 ing past vent ; caudal large. Color dark olive, more or less mottled above 

 with black ; sides with two ill-defined dark lateral bands, the interspaces 

 paler ; axils of the fins mostly crimson in life, as in related species. Length 

 2 to 5 inches. Streams of Colorado in the Colorado River Basin, very 

 abundant in small streams in the mountain meadows, less common in the 

 larger streams. (Named for Dr. Henry C. Yarrow, naturalist of the 

 Survey West of the Hundredth Meridian.) 



Agosia yarroivi, JORDAN & EVERMANN, Bull. U. S. Fish Comm., ix, 1889, (1891), 28, Tomichi 

 Creek and Gunnison River, Gunnison, Colorado. (Coll. Jordan, Evermann, Fesler, 

 & Davis.) 



Apocope oscula, COPE & YARROW, Zob'l. Wheeler Survey, 647, 1875, (1876), not of GIRARD ; JORDAN 

 & GILBERT, Synopsis, 211, 1883, in part. 



512. AGOSIA COUESII (Yarrow). 



Head 4 to 4ij depth 4.i to 4|; eye 4| to 5; snout 2f. D. I, 8, (some- 

 times 7); A. I, 7; scales 12-74-11, (range from 70 to 76); teeth 1 or 2, 

 4-4, 2 or 1. Barbel present. Body moderately stout, ventral and dorsal 

 outlines gently arched; head long and pointed; snout pointed, mouth 

 broad, inferior; eye small, high up; interorbital width equal to snout; 

 caudal peduncle long, slender, and compressed. Origin of dorsal behind 

 insertion of ventrals, about midway between base of middle caudal rays 

 and nostril. Scales small, firm and close-set; lateral line complete. 

 Color dark gray above and on sides to lateral line; below pale; no 

 lateral band ; fins all plain. Length 4 inches. Colorado River Basin. 

 (Named for Dr. Elliott Coues, the well-known ornithologist.) 

 Apocope couesii, YARROW. Field and Forest, 1876, and Zob'l. Wheeler Surv., 648, 1875, (1876), 

 Camp Apache, Arizona. 



513. AGOSIA ADOBE, Jordan & Evermann. 



Head 3$ to 3$; depth 4| to 5; eye 2 in snout, 5 to 5 in head. D. 8; 

 A. 7 ; scales 12-63 to 70-10. Body slender and elongate, the head long 

 and low, sharp in profile. Snout long, about 2f in head, its tip project- 

 ing considerably beyond the thick upper lip; mouth larger than in A. 

 nubila,the maxillary extending beyond nostril; barbel well developed. 

 Lateral line complete. Insertion of dorsal midway between front of eye 

 and base of caudal ; pectorals shortish ; caudal large. Length 2 to 4 

 inches. Clay-colored, with a dark lateral band ; back with some dark 

 dots. Sevier River, Utah, locally abundant, (adobe, clay, in Spanish.) 



Agosia adobe, JORDAN & EVERMANN, Bull. U. S. Fish Comm., ix, 1889, (1891), 36, Sevier River, 

 Juab, Utah. (Type, No. 41674. Coll. Jordan, Evermann, Fesler, & Davis.) 



514. AGOSIA NEVADENSIS (Gilbert). 



Head 3 to 4; depth 3| to 4; eye very small, 5$ in head, half iuteror- 

 bital width, which equals distance from tip of snout to middle of eye. 

 D. 8; A. 7; scales 65; pores about 58. Body robust, with broad, 

 heavy head, its greatest depth at occiput, 5 in body, (6i in A. nubila, 

 of same size). Mouth terminal, very oblique, the lower jaw included, 

 the premaxillaries not overlapped by snout. Maxillary 3 in head, reach- 

 ing front of eye ; barbels well developed ; scales small, very irregularly 



