78 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. V. 



Head 4^"; depth 5^; D. 8; A. 7; scales 17-88-10. Body elon- 

 gate, subterete; head small; the snout bluntish, 3^ in head; inter- 

 orbital area broad and flattish; mouth small, the maxillary not 

 reaching vertical from eye; lips somewhat thickened; lateral line 

 decurved anteriorly, complete; fins all very small; dorsal inserted 

 slightly behind origin of ventrals. 



Color olivaceous, silvery below; sides with a faint plumbeous 

 lateral band, ending in a small caudal spot; a dark dorsal stripe; 

 fins all plain. Length about 3 inches. 



72. Evarra tlahuacensis Meek. 



Evarra tlahuacensis Meek, Field Col. Mus. Pub. 65, 1902, 85; 



Tlahuac. 

 Valley of Mexico. 



FIG. 24. EVARRA TLAHUACENSIS Meek. 



No. 3681, Field Columbian Museum. 



Head 4; depth 5^; D. 8; A. 14; scales 95. Body elongate, rather 

 slender; snout blunt, its length 3^ in head; upper jaw protractile; 

 teeth 4-4, tips hooked, grinding surface fairly developed; mouth 

 little, oblique, tip of maxillary reaching margin of orbit; diameter 

 of eye 3^ in head; origin of dorsal fin midw.ay between base of 

 caudal and posterior margin of eye; about 38 scales in a series before 

 dorsal fin; first dorsal ray reaching beyond tip of the last ray, when 

 the fin is defiexed; lateral line complete, decurved above the pec- 

 torals; gill membranes connected to isthmus; peritoneum black; 

 the length of the alimentary canal equals distance from eye to tip 

 of caudal fin. 



Color dark olive, white below, the line between the colors very 

 distinct and extending from below eye to one-quarter distance. from 

 ventral surface of caudal peduncle; a dark vertebral and a dark 

 lateral band. Length about 2% inches. 



