76 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. III. 



nine rows of papillae on upper jaw; lower lip broad, deeply 

 incised, the two halves posteriorly forming an obtuse angle; 

 hinder margin of upper lip fringed with papillae; base of third 

 dorsal ray midway between tip of snout and base of caudal; about 

 45 scales in a series from nape to first dorsal ray; scales 

 below lateral line near middle of the body are smaller than those 

 above this line. 



Profile convex; interorbital convex, -i\ in head; pectoral fin 

 ij } in head, the tips not reaching ventrals; ventrals i \ in head; 

 distance from tip of ventrals to vent 3! in ventral fin; dorsal fin 

 longer than high, its height i| in head, length of base i\ in 

 head; the tip of last dorsal ray scarcely reaching opposite tips of 

 ventrals when fin is deflexed. 



Color, light steel blue on back, shading into a dark olive on 

 sides; lighter below, especially on posterior half of body, where 

 the line between the light and dark color is very marked. On 

 anterior half of body the colors gradually merge into one another. 



Eight small specimens also from Jimenez. The small speci- 

 mens 2-J inches in length are more robust and have a larger eye 

 than the type; the tips of pectorals reach anal fin. 



Sides with three large dark blotches resembling those on the 

 young of Catostomus commersonii. Dorsal fin also higher in the 

 young, longest ray about i^ in head, tip of first ray reaching nearly 

 to tips of last when fin is deflexed. In the larger specimen the first 

 rays reach but a short distance beyond base of last ray. Jimenez. 



Moxostoma congestum (Baird & Girard). 



A few small specimens from Santa Rosalia I identify as this 

 species. 



Moxostoma austrinum Bean. 



A few specimens were seen at La Palma and Ocotlan. All 

 were taken in Lago de Chalco. One specimen 9 inches in length 

 gives the following measurements: 



Head 4^; depth 4; distance from dorsal to snout 2^ in length 

 of body; eye 4 in the length of the head; snout i\\ base of 

 dorsal i|; longest dorsal ray il; pectoral i; ventral 1 3 : caudal 

 peduncle 2^; scales 48-18. This specimen has a shorter head 

 and smaller scales than those of fishes of this species, formerly 

 described. A few large specimens were seen at La Palma. 

 Ocotlan; La Palma. 



