422 PROCEEDINGS OF THE ACADEMY OF [May, 



P. microstictus Eigenmann both differ in the slender body, coloration, 

 etc., when compared with P. bondi. P. bairdii (Steindachner) has 

 the anal radii 40 to 42. 



(Named for Mr. Frank E. Bond.) 



APODASTYANAX gen. nov. 

 Type Apodastyanax stewardsoni sp. nov. 



Body elongated moderately, well compressed. Head moderate. 

 Mouth small. Teeth only in jaws, upper biserial and lower uniserial. 

 Maxillary small, reaches front eye edge, toothless. Rakers thin, 

 slender. Scales moderately small, cycloid, and only on base of caudal, 

 remainder of fin and other fins naked. L. 1. complete, median along 

 side. Dorsal inserted about midway in body. Anal with long base, 

 inserted about opposite dorsal origin. Adipose fin present. Caudal 

 emarginate. Pectoral low, moderate. No ventral fins. Coloration 

 brownish, silvered. A grayish shoulder spot and a dusky basal caudal 

 spot. Size small. 



This genus seems to be well separated from almost all the others in 

 the absence of ventral fins, of which there is no trace whatever. 



(A, without; -<>u$, foot; , aarodva^ } Astyanax; with reference to the 

 absence of the ventral fins.) 



Apodastyanax stewardsoni sp. nov. Fig. 2. 



Head 3f ; depth 24; D. hi, 9; A. hi, 39, i; P. i, 12; scales in 1. 1. 

 about 42 + 3? (squamation injured); 12 scales above 1. 1. ; 13 scales 

 below 1. 1. ; 21 predorsal scales; head width 2^ its length; mandible 

 about 2f ; dorsal base 1*; first branched anal ray about 2; least depth 

 of caudal peduncle 2^; pectoral 1^; snout 5 in head measured from 

 upper jaw tip; eye 2^; maxillary 3J; interorbital 2f. 



Body strongly compressed, deepest before middle or about first f in 

 total length at dorsal and anal origins, predorsal region with slightly 

 constricted or trenchant edge due to median keel, other edges rounded 

 convexly, and general contour ovoid. Caudal peduncle well com- 

 pressed, length about f its least depth. 



Head moderate, compressed, lower profile slightly more inclined, 

 flattened sides a little constricted below. Snout short, surface 

 convex, obtuse as viewed from above, length about half its basal 

 width. Eye large, circular, a little elevated, about first f m head. 

 Mouth small, transverse, with strong jaws. Maxillary small, vertical, 

 along front edge of eye below, and not extending below lower edge of 

 latter, its greatest expansion about 4 in pupil. Lips thin. Teeth 

 only in front of each jaw, none on maxillary. Upper jaw teeth 9 in 



