288 FISHES. 



rest of the fin olivaceous, or in spring males fiery orange ; 

 males in spring with many rounded tubercles on head, 

 and usually the whole upper surface in no other genus 

 are these nuptial appendages so extensively developed 

 scales deep, rather small and crowded anteriorly; intes- 

 tinal canal six to nine times the total length of the body, 

 its numerous convolutions passing above and around the 

 air-bladder, an arrangement found in Campostoma alone 

 among all the Vertebrates; D. I, 8; A. I, 7; lat. 1. 50 to 

 55; L. 4 to 8; herbivorous. Mississippi Valley, every 

 where abundant; one of the most curious and interesting 

 of American fishes. [C. dubium, (Kirt.) Cope. C. cal- 

 lipteryx, gobioninum^ etc., Cope.] 



2. PIMEPHALES, Rafinesque. ROUND -HEADED 



MINNOWS. 



1. P. promelas, Raf. FAT-HEAD. BLACK HEAD. 

 Head almost globular, black in adult males; snout in $ 

 with several large tubercles; body very short and deep; 

 scales crowded; eye small; mouth very small and short; 

 a large black dorsal blotch; males dusky; females oliva- 

 ceous; D. I, 7; A. I, 7; lat. 1. 46; L. 2|. Ohio Valley 

 to Upper Missouri. Known at sight, as it resembles 

 nothing else. 



3. HYBORHYHCHUS, Agassiz. BLTJNT-NOSED MINNOWS. 

 1. H. notatus, (Raf.) Ag. BLUNT- NOSED MINNOW. 

 Brownish or bluish, a dusky shade along sides, sometimes 

 forming a caudal spot; a distinct black spot on middle 

 of front rays of dorsal; head short; snout in spring 

 males with disproportionately large tubercles, usually 

 fourteen in all; no distinct barbel at each angle of the 

 mouth; scales in front of dorsal small and crowded; 

 D. I, 8; A. I. 7; lat. 1. 45; L. 3 to 4. N. Y. to Tenn., 

 Wis., and Mo.; very abundant in the Ohio Valley. 



