56 Annals of the Carnegie Museum. 



Compressed, head at the base of the occipital process very nearly 

 equal to the greatest depth. Preventral region rounded, scaled, but 

 without complete series of median scales. Postventral region narrow. 

 Predorsal region rounded. 



Occipital process short, interorbitals flat, frontal fontanel triangular, 

 narrower than the parietal, slightly longer than the parietal without 

 the occipital groove. Second suborbital leaving a narrow naked mar- 

 gin behind and below. Snout short, about half the length of the eye. 

 Mouth moderately large, lower jaw protruding beyond the upper when 

 the mouth is open. Maxillary | the eye ; mandible equal to the eye. 

 Premaxillary with five small conical teeth in the outer row and five 

 tricuspid teeth in the inner row. Maxillary with seven small conical 

 teeth closely packed together. Dentary with a series of four rather 

 broad tricuspid teeth, probably followed by several minute ones on the 

 sides. 



Scales cycloid, regularly imbricate, with striae few (2-3) ; no inter- 

 polated scales or rows of scales. Caudal naked. Anal sheath reduced 

 to a single small scale, not extended upon the first anal rays. Pores 

 developed on the first nine scales of the lateral line, the rest of the 

 scales in the series with a shallow notch on the free margin. The 

 series just below the slightly decurved lateral line parallel to it. 



Origin of the dorsal equidistant from the snout and caudal, penulti- 

 mate ray 1 of the longest which is 3.2 into the length. Caudal not so 

 long as the head. Origin of the anal on the vertical from the second 

 scale behind the dorsal. Anal emarginate, the longest ray about i-i- 

 into the length of the base. Ventrals on the vertical from the first 

 dorsal ray. Ventrals just reaching the anal. Pectorals short and 

 paddle-shaped with a fringe of soft rays. 



Humeral spot vertically elongate, very faint. No caudal spot, but a 

 few chromatophoresat the base of each caudal lobe. Lateral stripe very 

 dim. Scales of the back outlined with dusky. Fins without pigment. 



Genus Hemigrammus Gill. 

 Hemigrammus erythrozonus sp. nov. 



Type, 32 mm. (No. 1448 Carnegie Museum Catalog Fishes.) 

 Erukin. 



Cotypes, 32 specimens, 21-33 mm. Erukin. (C. M. Cat. Fishes 

 No. 1449, a-e ; I. U. Cat. No. 11905.) 



Distinguished by having along the sides a cherry-colored streak, 



