THE AMERICAN TETRAGONOPTERINAE. 53 



the lower jaw with a 



long row of very small 



single-pointed teeth. 



28. Creatochanes Giinther. 



//. Premaxillary teeth in 



three series. 



29. Bryconops Kner. 



(dd. Preventral area compressed, the scales of the two sides separated by a series of narrow 



median scales, the marginal scales of the two sides with their lower margins straight; outer 



ventral rays filiform Zygogasler Eigenmann '). 



ddd. Preventral area with two series of large overlapping scales; origin of anal in advance of 

 the origin of the dorsal or but little behind it; premaxillary with an inner series com- 

 posed of several tricuspid and several conical teeth; the outer series of the premaxillary 

 of two or three tricuspid and usually one or more conical teeth. 



/. Lateral line com- 

 plete; caudal 

 naked. 

 30. Phenocogasler Eigenmann. 

 JJ. Incomplete lateral 

 line. 

 31. Vesicatrus Eigenmann. 

 66. Teeth all conical; mouth very large, the lower jaw entering the profile. 



32. Genycharax Eigenmann. 

 cc. Gill-rakers short, lanceolate; anal long (29); lateral line complete; maxillary with conical teeth 

 along half of its length; premaxillary and mandibular teeth as in Tetragonopterus. 



33. Scissor Giinther. 

 aa. Upper lip not covering the premaxillary teeth. 



K. Premaxillary 



teeth in a main 

 outer series 

 and a minor 

 inner series of 

 two or more 

 teeth; a pair 

 of conical 



teeth behind 

 the main series 

 of the man- 

 dibulary teeth 

 in front. 

 34. Henochilus Garman. 

 KK. Premaxillary 



with one series 

 of teeth; no 

 conical teeth 

 in the lower 

 jaw. 

 35. Psalidodon Eigenmann. 



1 This has been made a subgenus of Astyanax. 



