1903.] NATURAL SCIENCES OF PHILADELPHIA. 529 



Ventral serrse in the co-types 34 and 36 ; of these there are in one 22 

 simple spines, 9 with a double (anterior and posterior) tip and 3 bilat- 

 eral ones ; in the other there are 21 + 11 + 3. 



Form nearly circular. The dorsal profile is very slightly concave at 

 the occiput and the ventral profile about equally concave at the 

 isthmus. Lateral line but slightly decurved near its anterior end. 



The distance from the origin of the dorsal to the lateral line f distance 

 between lateral line and lowest point of the ventral profile. 



Supraoccipital process extending ^ to origin of dorsal. 



Length of head less than its depth by ^ diameter of eye. Posterior 

 outline of opercle much flattened, its width 3^ in its depth. Suborbi- 

 tals very narrow, leaving the cheek entirely naked. Maxillary oblong, 

 directed straight downward. Mandible with an outer row of 10-12 

 strong teeth with oblique cutting edges and an inner row of 2 conical 

 teeth at the symphysis. Pre maxillary with an outer row of 6-8 medium- 

 sized teeth similar to those in the mandible, and an inner row of 6-8 

 heavy broad-tipped teeth close against the outer row and alternating 

 with them. The outer row lacks the middle tooth. 



Snout equals ^ diameter of eye. Eye large, 2| in head, 1^ in inter- 

 orbital. 



Base of dorsal 1| in its height, which equals depth of head. 



Distance between dorsal and adipose dorsal H in base of dorsal, 1 in 

 base of adipose. Height of adipose about 3^ in its length. 



Caudal broad, widely emarginate, its middle rays 3 times in distance 

 between tips of its lobes. Caudal peduncle small, its depth equal to 

 diameter of eye. 



Pectorals small, 1^ in head. Ventrals very small and narrow, equal 

 to pectorals, not reaching vent. 



Anal slightly lower at its posterior end than at its anterior, its pos- 

 terior margin slightly convex. 



Color light brown, with 7-8 irregular bars and a few indistinct^spots 

 of darker above the lateral line. Fins immaculate. 



This species stands nearest to Af. Uppincottianus, from which it 

 differs in the greater depth, in the more evenly rounded ventral'profile 

 and in a narrow subopcrcle. 



89. Myleus tiete Eigenmann and Norris. 



A specimen of this species was overlooked when the report on the 

 fishes of S. Paulo, Brazil, was prepared {Revista do Museu Paulista, IV, 

 1900). The type was but 30 mm. ; the present specimen is much larger, 

 measuring 155 mm. It differs from the type considerably in propor- 

 tions and in color. 

 34 



