770 



THE AMERICAN NATURALIST [Vol. XLI 



14. — Thoracocharax, proposed as a subgenus of Gasteropele- 

 cus because the " Anterior profile of back [is] convex," is a dis- 

 tinct genus characterized by its dentition and not by the degree 

 of the convexity of the back. 



15. — Cyrtocharax is synonymous with Cynopotamus, a sub- 

 genus of Charax. The type of Cynopotanuis lacks a second 

 row of teeth in the lower jaw. 



16. — Eucynopotamus may be used for the genus hitherto 

 known by the name Cynopotanuis, since the type of this genus 

 does not possess the generic characters distinguishing the other 

 species hitherto relegated to this genus from Charax. The divi- 

 sion of this genus into a subgenus with less than 75 scales and 

 another with more is not fortunate, since the scales are 76-77, 79- 

 97, 110-120 and 115 respectively in giilo, knerii, magdalenae and 

 humeralis. 



17. — Cynocharax, a new subgen us of Roeboides, I am unable 

 to pass judgment upon in the absence of material and through 

 the neglect of Dr. Fowler to state what species it includes. 



LS. - The subgenus Spliyraenocharax is said to be (h'stinguished 

 by having the depth IV, to 4 in the loiigtii. It api>arently consists 

 of brachyccphahis and abbreviafus, with the latter the ty])e. The 

 teeth are too imi)erfectly redescribed to place tliem. Cope's 

 figure of brachijcrp/talKs shows it to be allied to the ty{)e of Aces- 

 trorham|)hus. Tiie cliaracter of the teeth of ahhrtuafm' is still 

 in doubt. ( op." <;.y. "There are t^^o .hstinct large canines on 

 the anterior part of the iiiaxiUary bone and four .mailer ones; 

 maxillary teeth are minute." Presumably the iirst "maxillary" 

 is a misprint for premaxillary. Fowler says: "al)()ut 6 well 

 developed [canines] in the upper" jaw. This species is also allied 

 to the type of Ace.strorhamphus. Now the type of Acestrorham- 



