254 . PROCEEDINGS OF THE ACADEMY OF [Apr., 



Scales on back all reduced in size and crowded. Caudal base and 

 anal base covered with small scales. No scaly axillary flaps. L. 1. 

 complete, extends as decurved a little below middle in greatest depth 

 and sloping up low along side of caudal peduncle to caudal base 

 medianly. Tubes of mostly simple structure, though ends in pos- 

 teriorly downward directed prong. 



Dorsal inserted a little nearer caudal base than snout tip, first 

 branched ray longest, and depressed fin reaches 2J to caudal base^ 

 Adipose fin small, its length If in eye, and its origin nearer caudal 

 base than depressed dorsal tip. Caudal (damaged) slightly emar- 

 ginate and lobes apparently equal? Anal inserted slightly before 

 middle of dorsal base, anterior rays slightly longer than others, and 

 fin base not quite twice dorsal length. Pectoral broad, low, inserted 

 slightly behind gill-opening, and reaches back apparently to anal 

 (tip damaged). Ventral inserted a little nearer anal origin than 

 pectoral origin, and fin about reaches latter. Vent about last 

 fourth in space between ventral and anal origins. 



Color in alcohol dull brownish on back, becoming paler below and 

 on abdomen. Head brownish above, sides and below pale or whitish. 

 Front of lips tinged brownish. Iris slaty. Fins all pale brownish, 

 mostly with more or less dusky tints. 



Length 210 mm. (caudal damaged). 



Type, No. 39,337, A. N. S. P. Rupununi River, British Guiana. 

 J, Ogilvie. 



Only the above example known. In the figure, the ends of the- 

 fins aye restored in some cases. 



(Named for Mr. J. Ogilvie, who collected the type.) 



ACESTRORHYNCHIN^. 

 Acestrorhynchus falcirostris (Cuvier). 

 Two examples, 227 and 233 mm. 



HYDROCYNIN.^. 



Hydrooynus cuvieri (Agassiz). 



One example 314 mm. 



ERYTHRININ.E. 



Hoplias malabaricus (Bloeh). 



Two examples, 150 and 155 mm. 

 Erythrinus unitaeniatus Agassiz. 



One example 160 nnn. 



