eigenmann: tetragonopterid characins. 99 



To this species probably belong many specimens, 21-4] mm. long (to base of 

 caudal) from Santa Cruz, collected by Dom Pedro II. Ou account of the poor 

 condition of the types an absolute identification is impossible. 



Seven specimens, 73-100 mm. long, in very poor condition, are undoubtedly a 

 species of Deuterodon distinct from D. iguape. 



Deuterodon parahybae, sp. nov. 



Head 3.5-4; depth 2.5-3; D. 11; A. 24-26, usually 25. 



Compressed elliptical ; caudal peduncle as high as long. Second suborbital 

 leaving a very narrow naked area ; maxillary with 2 or 3 teeth ; scales mostly 

 fallen off, cycloid, with several slightly diverging striae. 



A well-defined vertical, humeral spot ; a large caudal spot, the middle caudal 

 rays black. 



Eight specimens, 46-53 mm. Itapemirim, Hartt & Copeland. 



Pristella, gen. nov. 



This genus differs from Hemigrammus as Hemibrycon differs from Astyanax. 



Lateral line incomplete ; caudal naked ? Premaxillary with two series of teeth, 

 those of the outer series with parallel margins, a prominent, broad, central lobe 

 and two receding shoulders, the teeth becoming conical toward the sides, the 

 posterior series within margin of jaw 1-pointed or 3-pointed incisors, with the 

 middle much the higher ; maxillary with minute conical teeth scattered along most 

 of the margin : lower jaw with a single series of teeth, imperfectly tricuspid, the 

 points broad, not unlike those of the upper jaw, graduated, the lateral teeth minute, 

 conic; snout and maxillary 2-2.5 in head; gill-rakers long, setiform; gill mem- 

 branes free from each other and from isthmus. 



Type. — Holopristes riddlei Meek. 



Psellograminus, gen. nov. 



Allied to Hemigrammus, but with the lateral line extending with interruptions 

 to the caudal, the anal originating under the origin of the dorsal or still further 

 forward. 



Type. — Hemigrammus kennedyi Eigenmann. 



Hemigrammus coeruleus Durbin, sp. nov.* 



Head 3.5 ; depth 2.75 ; D. 11 ; A. 20-22 ; scales 5-31 or 32-3|, 7 or 8 with 

 pores ; eye 2.5-2.66 in head; interorbital equal to eye. Maxillary a little longer 

 than the eye, with four or five, sometimes two or three, tricuspid teeth. 



1 The descriptions of the species of Hemigrammus and of Hyphessobrycon are the 

 work of Miss Marion Lee Durbin, an able and earnest student of the Characins. 



