128 FISHES OF ILLINOIS 



Spawning females, with eggs running from the vent, have been 

 taken by us from the first to the last of May, and occasional speci- 

 mens were found full of eggs as late as July 30. The eggs are ex- 

 tremely adhesive, and contain no oil globule. The males average 

 smaller in size than the females, and have the back somewhat more 

 Swollen at the nape. Their sides are rough with minute tubercles, 

 but the head and snout are not tuberculate. 



Genus CLIOLA Girard 



Fishes with the form and appearance of Pimephales , but with the 

 alimentary canal shorter than the body, the peritoneum pale, and the 

 teeth more hooked — allying them rather with Notropis; mouth inferior; 

 premaxillary protractile; teeth 4-4; dorsal rays 8, the anterior ray club- 

 shaped and separated from the second by membrane, as in Pimephales ; 

 anal rays 7; scales 42 to 48; lateral line developed. Size small, 2\ to 3 

 •inches. Two species known; central and southwestern United States. 



Fig. 28 



CLIOLA VIGILAX (Baird & Girard) 

 (bullhead minnow; fathead) 



Baird & Girard, 1853, Proc. Ac. Nat. Sci. Phila., 391 (Ceratichthys). 

 &., VTI, 259 (Leuciscus tudltanus) ; J. & G., 165 (tuditana), 166 (taurocephala), 

 169; M. V., 54; J. & E., I, 253; J., 56 (Alburnops tuditanus) ; F., 78; L., 15. 



Length 2 to 3 inches; body stout, only moderately elongate, not 

 much compressed, the thickness of the body in the predorsal region 

 contained about 1 \ times in its depth ; depth 4. 1 to 4 . 5 in length ; caudal 

 peduncle stout, shorter than head, its depth l.S to 2.2 in its length. 

 Golor dusky olive or yellowish above; sides silvery, with but a faint 

 Suggestion of a dark lateral band; a small jet-black caudal spot, and a 

 prominent black spot on the anterior 3 or 4 rays of the dorsal fin about 

 half way up; spring males with head leaden to blackish, and entire body 

 more or less dusky. Head 3 . 7 to 4 . 1 in length, broad and flat above and 

 little tapered forward, the muzzle very blunt ; width of head 1 . 5 to 1 . 7 in 



