Io8 UNIVERSITY OF COLORADO STUDIES 



the middle of the posterior margin of the eye to the middle of the operculum where 

 it breaks up into a suffuse dusky spot; posterior margin of the operculum with a 

 dark spot; a small but distinct black humeral spot; sides of the body sprinkled 

 with minute dots of blue or black; dorsal fins brick red, caudal reddish to orange, 

 pectorals, ventrals and anal yellowish; rays of the fins crossed with several rows 

 of black spots giving them a barred appearance, the 7 or 8 rows of spots on the 

 caudal very conspicuous, the 4 or 5 rows on the soft dorsal quite prominent, the 

 4 or 5 rows crossing the pectorals rather indistinct, and the rows of spots on the 

 ventrals and anal quite indistinct. Size very small; length under 2 inches. 



Cragin's Darter is known only from the Arkansas River and its tributaries 

 west of Garden City, Kansas. 



Colorado specimens. — University museum: Outlet to Sells Lake, Canyon City, November 

 8, 1913 (5 specimens, 35-52 mm.), A. G. Vestal and M. M. Ellis, No. 406. 



Etheostoma iowae Jordan and Meek 



Iowa Darter 



Etheostoma iowae Jordan and Meek, Proc. U.S. Nat. Mus., p. 10, 1885 (Chariton River, 

 Chariton, Iowa); Juday, Univ. Colo. Studies, Vol. II, p. 113, 1903 (Longmont); Cockerell, Univ. 

 Colo. Studies, Vol. V, 1908 (Boulder Creek, Boulder); Jud.^y, Bull. U.S. Fish Com. for 1904, 

 p. 227, 1905 (Longmont). 



Body elongate, compressed back of the pectorals, depth 4.75 to 6, usually 

 about 5. 25, in the length to the base of the caudal; head long and rather com- 

 pressed, somewhat flattened dorsally, its length 3 . 25 to 4 in the length of the body; 

 snout short and blunt ; eye large, its center about twice as far from the posterior 

 margin of the operculum as from the tip of the snout, situated above the middle 

 of the side of the head, dorsal margin of the eye on a level with or slightly higher 

 than the top of the head ; diameter of the eye greater than the interorbital distance, 

 equal to or usually greater than the length of the snout, and 4 to 5 in the head; 

 nostrils small, just belovv the dorsal margin of the side of the head and about one- 

 third of the distance from the tip of the snout to the eye in front of the eye ; mouth 

 moderately large, terminal and slightly oblique; angle of the mouth reaching the 

 level of the nostrils; premaxillaries not protractile, frenum narrow, about one-half 

 the diameter of the eye; dorsals separate, the soft dorsal slightly higher than the 

 spinous dorsal, spine VIII or IX, rays 8 to 11, the first spine of the dorsal slightly 

 behind the origin of the pectorals, first ray of the soft dorsal in front of the anal 

 opening; pectorals rather large, a little more than i in the head; ventrals small; 

 anal smaller than the soft dorsal, anal spines II, rarely I, rays 6 to 8, usually 7; 

 scales small and strongly ctenoid, with 8 to 12 basal radii and 10 to 15 apical teeth; 

 lateral line interrupted; scales 5 to 7, 55-61, 9 to 11; cheeks and opercula scaled; 

 general body form much the same as that of young specimens of Boleosoma nigrum. 



General color greenish to olivaceous, darker dorsally; mid-dorsal region with 

 7 or more blotches of dark brown; lateral line region crossed by 8 or more irregular 



