ON SPECIES OF CYNOPOTAMUS. 13 



Lake Hyanuary, Manacapoura, Kio Puty, Sao Paolo, San 

 Gongallo, Serpa, Tabatinga and Tonantins. 



CYNOPOTOMUS XENODON Rht. ; Ltk. 



D. 11, A. 50, L.I. 66, L.tr. -g- 



In shape and markings the specimens placed under this 

 name closely resemble (7. pauciradiatus- The rays in the 

 anal vary from 48 to 55, the scales in the lateral line from 

 61 to 70, and those in the transverse series from 14 to 16 

 above the line and from 13 to 14 below it. Large num- 

 bers were taken at Lake Saraca and at Serpa ; it was also 

 secured at Arary, Lago Alexo and Obydos. 



CYNOPOTAMUS GUATEMALENSIS. 

 Anacyrtns guatemalensis Gth. 



On a couple of a number of individuals from the Chagres 

 river, the formula is D. 11, A. 48-50, L.I. 83-90, L.tr. 

 fjifj-* The depth of the body is about two and three- 

 fourths times and length of the head four and one-third 

 times in the total length, without caudal. 



CYNOPOTAMUS KNERII. 

 Anacyrtus Jcnerii St. 

 D. 11, A. 46, L.I. 86, L.tr. -g- 



Small specimens from Tabatinga have a distinct caudal 

 blotch but are without the humeral spot. The silvery 

 band on the flank is narrow but well defined. 



CYNOPOTAMUS HUMERALIS C. V. 



Near the middle of its length the silvery band of the 

 flank occupies the six scales immediately above the lateral 

 line. The humeral and the caudal spots vary much in 

 depth of color, usually both are present. The number of 



