Ellis: Hasemania, Hyphessobrycon, and Hemigrammus. 151 



scales. Predorsal region rounded, with a regular series of aboul 

 eleven scales. Occipital process short, 6 or more in the distance 

 from its base to the dorsal, lntrriu-hii.il almost flat. Frontal 

 Fontanel truncate, not so wide as the parietal, three-fourths as long 



as the parietal without the occipital groove. ' Second suborbital 

 with narrow naked margin behind and below. Maxillary less than 

 the eye, 3.6 in the head. Mandible equal to the eye. Premaxillary 

 with tour seven-pointed teeth in the inner row, and one conical or 

 tricuspid tooth representing the outer series. Maxillary without 

 teeth. Dentary with three broad, chisel-shaped teeth with eight 

 or nine points. Gill-rakers 8 + 11. Scales cycloid. Probably 

 no interpolated Males or rows of scales. Anal sheath very short 

 or lacking. Later, d line with pores on the first three to six scales. 

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

 est ray 3.8 in the length. Origin of the anal on the vertical from 

 the last dorsal ray. Anal rounded, the longest ray equal to the 

 base. Ventrals on the vertical from the third or fourth scale in front 

 of the dorsal. Ventrals reaching to the third or fourth scale in 

 front of the anal. Pectorals (of fishes over 16 mm. in length) nor- 

 mal in form, and reaching the fourth or fifth scale in front of the 

 ventrals. Pectorals of specimens of less than 16 mm. in length 

 archaic. Adipose lacking. Xo true humeral or caudal spots. A 

 heavy black lateral stripe from the caudal peduncle to the head, 

 much fainter over the region of the body-cavity. An almost straight 

 black line from the caudal along the under side of the caudal peduncle 

 to a point just above the origin of the anal. Last four scales of the 

 back black. Fins all unmarked. Scales above the lateral stripe 

 heavily outlined with dusky. 



Genus Hyphessobrycon Durbin. 



4. Hyphessobrycon taurocephalus sp. now 



Plate I, fig. 4.* 



Type, 55 mm. C. M. No. 3007. Serrinha Parana, Rio Iguassii. 



Cotypes, thirty-two specimens, 39 to 55 mm. C. M. No. 3008. Serrinha 

 Parana, Rio Iguassii. 



Colypes, twenty-two specimens, 30 to 45 mm. C. M. No. 3009. Porto Uniao, 

 Rio Iguassii. 



* The figure is incorrect, in that it does not show the pygiform, which is located 

 vertically above the posterior extremity of the insertion of the anal. — Editor. 



