FISHES OF COLORADO 5 1 



orly, slightly overhanging the closed mouth; mouth rather smaD, oblique to 

 ventral; angle of the mouth not reaching the anterior margin of the eye, but on 

 a level with the nostrU; pharyngeal teeth usually 0-4-4-0, distinctly hooked; 

 dorsal fin short and rather high, length of its base about i . s in the length of its 

 longest ray; base of the first ray of the dorsal on a level with the base of the 

 ventrals, dorsal rays 7, sometimes S; pectorals short, not reaching the ventrals 

 by almost the length of the latter (females) or by about one-half the length of the 

 ventrals (males) ; ventrals barely if at all reaching the anal opening; anal fin short, 

 of usually 7 rays; scales large, 5 or 6, 33-39, 4; lateral line complete, slightly 

 decurved in the pectoral region; predorsal region regularly scaled, 14 to 16 scales 

 in front of the dorsal; size small, length 3 inches or less. 



Color above the lateral line yellowish overlaid with dusky and greenish; 

 sides silvery, ventral parts cream color to white; mid-dorsal region with a narrow 

 but distinct dusky stripe (indistinct in but 3 out of 147 specimens examined for 

 this character) ; sides just above the lateral line with a dusky bluish stripe, usually 

 rather distinct in the caudal half of the body, where in the young it ends in a small 

 caudal spot, this spot often indistinct in adults; a row of hyphen-shaped black 

 marks on each side of the lateral line pores; scales above the lateral line outlined 

 with dusky giving the upper half of the body, especially in the predorsal region, 

 a distinctly reticulated pattern; fins hyaline, rays often outlined with dusky; 

 head dark above. 



Notropis scylla is a species of the plains streams of the western part of the Mis- 

 sissippi Valley near the Rocky Mountains. Females taken at Julesburg and 

 Ovid, July 19 and 20, 1912, were distended with well-developed eggs. 



Colorado specimens. — University Museum: Boulder Creek, Boulder, October, 1903 (3 

 specimens, 60-75 mm.), C. Juday and J. Henderson, No. 28; St. Vrain Creek, Longmont, Octo- 

 ber 17, 1903 (3 specimens, 60-70 mm.), C. Juday and D. W. Spangler, No. 20; South Platte, 

 Julesburg, July 19, 1912 (174 specimens, 40-70 mm.), J. Henderson and M. M. Ellis, No. 357; 

 Lodgepole Creek near Ovid July 20, 1912 (18 specimens, 50-75 mm.), J. Henderson and M. M. 

 Ellis, No. 358; Republican River, Wray, October 26, 1912 (51 specimens, 30-70 mm.), A. G. 

 Vestal and M. M. Ellis, No. 359; State Teachers' College Museum: Cache la Poudre near Greeley, 

 A. E. Beardsley. 



Notropis horatii Cockerell 

 Notropis horatii Cockerell, Science, N.S., Vol. XXXIV, p. 614, 1911 (South Platte. Julesburg). 



A very doubtful species, based at present on a single specimen. Although 

 extensive collections have since been made at the exact station from which this 

 unique specimen was taken, no other individuals referable to this species have been 

 found. The following data are compiled from the original description: 



Head 5. 2 in the length to the base of the caudal; dorsal rays 8; anal rays 9; 

 scales 5 or 6, 38-40, 4; eye a little more than i in the snout; mid-dorsal stripe 

 present; length 47 mm. 



