1906.] NATURAL SCIENCES OF PHILADELPHIA. 349 



base of caudal, and 3 more on latter; 7 scales in an oblique series back 

 from origin of dorsal to lateral line; 6 scales in a vertical series from 

 base of ventral to lateral line, and same number from origin of anal to 

 latter: about 15 scales before dorsal; pectoral H in head; ventral If; 

 lower caudal lobe 1 ; snout 3f in head, measured from tip of upper jaw ; 

 eye 3; interorbital space 2f ; least depth of caudal peduncle 2t. At 

 least one small denticle at base of maxillary. Posterior distal ex- 

 tremity of maxillary extending till opposite anterior margin of pupil. 

 Rakers about 9 + 15, slender, pointed and longest much shorter than 

 filaments. In alcohol with a pale dusky humeral blotch. A dash of 

 dusky on middle of side of caudal peduncle at base of caudal, fading 

 out over posterior portion of anal, though posterior it extends out on 

 middle caudal rays. About ten distinct longitudinal brownish lines on 

 body, darker on back, and made up of dark brownish specks or dots. 

 Iris brownish with a darker brownish ring. Length 3if inches. 



Dr. Steindachner's figure in Sitz. Ak. Wiss. Wien, C, 1891, p. 368, 

 PI. 2, fig. 1, does not show the dusky streak on the side of the caudal 

 peduncle. 

 Astyanax chapadae sp. nov. Fig. 33. 



Head 3f ; depth 3; D. m, 8; A. iv, 18; P. i, 9; Y. i, 7; scales 39 m 

 lateral line to base of caudal, and 3 more on latter; 6 scales from origin 

 of dorsal obliquely back to lateral line, and 4 in same way from origin 

 of adipose fin; 4 scales between origin of ventral and lateral line 

 obliquely forward; 4 scales between origin of anal and lateral line; 16 

 scales before dorsal; width of head HI in its length; depth of head 

 over middle of orbit, U; snout 3^; eye 3; maxillary 2^; interorbital 

 space 3; mandible 2f ; length of depressed dorsal H; pectoral 1^; 

 ventral 2; upper caudal lobe l^V; least depth of caudal peduncle 2f . 



Body elongate, compressed, rather ovoid, lower profile a little more 

 convex than upper, and greatest depth at origin of dorsal. Predorsal 

 recrion rounded. Postdorsal region with a median obtuse keel. Pre- 

 veiitral region rounded. Postventral region slightly trenchant. 

 Caudal peduncle compressed, and its least depth about f its length. 



Head a little long, somewhat attenuated, well compressed, muzzle a 

 little pointed, upper profile a little concave above eye posterioriy, and 

 lower profile rather evenly convex. Snout a little long, convex, and 

 produced a little beyond tip of mandible. Eye circular, a little superior 

 and its center about first f in head. Mouth a little oblique. Maxillary 

 obliquely vertical, its distal expanded extremity reaching about op- 

 posite front margin of pupil and its width about half of diameter of 

 same. Mandible strong. Lips rather fleshy. Teeth in jaws mostly 



