EIGENMANn] south AMERICAN FRESH-WATER FISHES 147 



14. BO ULENGERELLA 

 New genus of Hydrocyoninas, allied to Xiphostoma. 



Teeth on palate minute, granular. Belly rounded. Snout greatly 

 produced, conical. Premaxillary and mandible very long, with a 

 single series of very small, equal, recurved teeth. Scales small. 

 Lateral line incomplete. Anal short, of lo or ii rays. 



Type. — Xiphostoma lateristriga Boulenger. 



For Dr. G. A. Boulenger, of the British Museum. 



IS. GILBERTELLA 

 New genus of Cynodontinse. 



Origin of dorsal above anal ; anal with about fifty rays ; pectoral 

 very long, reaching beyond origin of anal. Lower jaw with a pair 

 of canines on each side, of which the outer one is larger ; a pair of 

 small canines behind the front series in front ; teeth otherwise in a 

 single series. 



Type. — Anacyrtus alattis Steind. 



For Dr. C. H. Gilbert, of Leland Stanford Junior University. 



16. ACNODON 

 New genus of Mylesinae. 



Premaxillary teeth with an oblique, cutting edge, in two series. 

 No abdominal serrse in front of the ventrals. Gill-rakers filamentous. 

 No predorsal spine. 



Type. — Myleus oHgocanthus, Miiller & Troschel. 



a, privative ; xvwdcov, projections on a hunting spear. 



17. MYLEOCOLLOPS 

 New subgenus of Metynnis. 



Premaxillary teeth with an oblique, cutting edge, in two series. 

 Abdominal serrae along the entire ventral surface. A procumbent 

 dorsal spine. Adipose fin long ; dorsal of less than 20 rays ; free 

 margin of anal convex, or with a single lobe in front. Gill-rakers 

 short, not setiform. 



Type. — Metynnis gocldii Eigenmann = Myletes lippencottianus 

 Ulrey, not Cope. 



Myleus, name of an allied genus ; xoUo(/', ridge of skin on neck of 

 horse. 



