350 



PROCEEDINGS OF THE ACADEMY OF 



[June, 



quindeiitate, especially those in mandible anteriorly which are also long 

 and pointed, and five in each outer series above. At least three small 

 serrated teeth along base of maxillary. Tongue elongate, fleshy and 

 not free. Nostrils together near upper front rim of orbit. Interorbital 

 space a little convex. Greatest width of infraorbital rim a little less 

 than orbit or much broader than greatest exposed width of opercle. 



Gill-opening extending forward opposite front margin of pupil. 

 Rakers about 7 + 10, lanceolate, rather far apart, and longest about 

 f of longest filaments. Filaments about equal to pupil. Isthmus 

 narrow. Branchiostegals 4. 



Scales large, well striated, largest on flanks, and in longitudinal 



Fig. 33. — Astyanax chapadce Fowler. 



series parallel with lateral line. Basal anal sheath low and of small 

 scales. Base of caudal well covered with small scales. Axillary 

 ventral scale about ^ length of fin. Lateral line well decurved and 

 running rather low posteriorly to base of caudal. Tubes simple. 



Origin of dorsal a little nearer base of caudal than tip of snout, 

 fin low, and when depressed reaching f of space to base of caudal. 

 Adipose fin small, its origin near last third in space between origin 

 of dorsal and base of caudal, or just behind base of last anal ray, 

 and length of fin less than orbit. Origin of anal about opposite 

 base of penultimate dorsal ray, or about midway between that of 

 pectoral and base of caudal. Caudal rather small, emarginate, and 

 lobes rounded. Pectoral falling a little short of ventral. Ventral 



