224 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
anterior ; preinaxillaries protractile ; fold of lower lip not crossing the 
symphysis ; lower jaw trenchant, without horny covering ; no barbels. 
Gill-rakers short. Pharyngeals strong. Teeth 3-3, of the MylocMlus 
type, more or less cylindrical, with rounded grinding surfaces, posterior 
more slender and snbconical. (<Tr stump ; o(5<yv, tooth.) 
352. S. sig’iiifcr Garman. 
Dorsal and ventral outlines similar. Eye large, longer than snout. 
Mouth oblique, the maxillary not reaching front of eye. Lower jaw the 
longer. Pectorals not reaching ventrals, the latter to anal. Brown; 
silvery below ; a broad brown lateral b^nd, bordered above by a nar- 
row silvery line. Head 3§; depth 3f. D. 8; A. 8; scales 6-35-2; 
“ teeth 3-3, stout, stump-like, with convex summits.” Lago de Parras, 
an isolated lagoon in Coahuila, Mexico. (Garman.) 
(Garman, 1. c. 90.) 
98.— MYLOCHfLUS Agassiz. 
(Mylooheilus Agassiz, Amer. Journ. Sci. Arts, 1855, 229: typo Mylocheilua lateralia 
Agassiz = Leuciscus caurinus Rich.) 
Body elongate, not elevated, little compressed. Head rather short, 
conic, somewhat pointed. Mouth rather small, little oblique, the lower 
jaw included ; maxillary with small barbel at its end ; upper jaw pro- 
tractile. Scales moderate not closely imbricated. Lateral line de- 
curved. Dorsal fin beginning nearly opposite ventrals. Caudal fin with 
the rudimentary rays little developed. Anal basis short. Intestinal 
canal about as long as body. Teeth 2, 5-5, 2, or 2, .'i-I, 2, two or three 
of those in the main row molar, much enlarged, blunt and truncate 
above. (A third deciduous row sometimes present, according to Girard, 
in this genus and in Mylopharodon} we have seen nothing of the kind.) 
Size large, grinder; lip.) 
353. M. caill’iiius (Richardson) Grd . — Columbia Chub. 
Eye large, shorter than snout, 5 in head ; interorbital space broad, 
convex. Mouth horizontal or nearly so, the maxillary not reaching the 
front of the eye ; suborbital bones wide; preorbital elongate. Color 
dark above; sides silvery, a dark lateral band; below this a pale 
stripe; under which is a dark stripe which extends about to the vent; 
fins plain; belly and pale stripe red in spring males. Head4|; depth 
4^. D. 8; A. 8; scales 13-70-10; teeth 2, 5-5, 2. L. 12 inches. Streams 
