160 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



t Fontauelle well developed : lips without evident cartilaginous sheath. 

 d. Dorsal fin comparatively long, of 12 to 14 rays. 



e. Mouth quite large, with very large lips, the upper full and pendent, 

 with 6 to 8 rows of strong papilla : head large, 4 in length, 

 rather narrow, quadrangular, the snout projecting: eye 

 large: dorsal fin much longer than high, its rays about 14: 

 scales 12-72-10 : coloration rather dark ; a dusky lateral 

 stripe MACROCHILUS, 28. 



ee. Mouth comparatively small, smaller than in C. teres; the upper lip 

 thick, with 5 or 6 rows of papillae, which are moderately 

 large : head rounded above, 4| in length, the profile steeper 

 than in C. teres, the snout more pointed, the two sides of the 

 head more convergent forwards : eye small : dorsal fin longer 

 than high, its rays 12 to 14: scales 13-72-10. 



OCCIDENTALS, 29. 



dd. Dorsal fin short, higher than long, of about 11 developed rays : head 4 

 in length, rather bluntish: mouth moderate, the labial papillae 

 largely developed, the upper lip full, with about 5 rows of 

 large bat rather sparse papillae : scales 12-74-10 : color dark 

 above; sides clouded with black and yellow... LABIATUS, 30. 

 tt Fontanelle very small and narrow : both jaws with a weak cartilaginous sheath : 

 body elongate, fusiform, subterete, the greatest depth 4 to 4 

 in length : head small, conical, 4f in length : mouth quite 

 large, with fall, thick lips, the upper very wide and pendent, 

 with about 6 rows of very strong papilla3 : lower lip two- 

 lobed, similarly papillose : interorbital space wide, convex : 

 eye elevated, posterior, quite small: fins moderate; dorsal 

 higher than long, with 10, rarely 11, rays: ventral rays 10: 

 scales small, crowded forwards, 10 or 0-70-8: color dark; 



scales with dark punctulations AR^OPUS, 31. 



*** Scales verv small, much reduced and crowded anteriorly ; 83 to 115 in the lateral 

 line, and 25 to 40 in a transverse series from the ventrals tD 

 the dorsal : body and head more or less elongate : sides with a 

 broad rosy or orange lateral band in spring males. (Cato- 

 stomus.) 

 Fontanelle well developed: jaws without evident cartilaginous sheath. 



/. Upper lip comparatively thin and narrow, with but few (3 or 4) rows 



of papilla3. 



g. Body shorter than in the next, but still elongated, its greatest depth 

 4-J to 5 in length : head very large and long-acuminate, tbe 

 muzzle nearly one-half its length, overhanging the rather 

 large mouth : lips moderate ; the upper pendent, with about 3 

 rows of small papilla ; the lower rather full, similarly papil- 

 lose: eye nearly median, rather small, 8 in head: scales 

 small and crowded forwards, closely imbricated, 83 to 87 in 



