ON SPECIES OF CTNOPOTAMUS. 13 
Lake Hj'anuaiy, Manacapoura, Kio Puty, Sao Paolo, San 
Gongallo, Serpa, Tabatinga and Tonantius. 
Cynopotomus xenodon Rht. ; Ltk. 
D. 11, A. 50, L.l. 66, L.tr. 4^• 
In shape and markings the specimens placed under this 
name closely resemble G. pauciradiaius. 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. 
Aiiacyrtns guatemalensis Gth. 
On a couple of a number of individuals from the Chagres 
river, the formula is D. 11, A. 48-50, L.l. 83-90, L.tr. 
^^' 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 knerii St. 
D. 11, A. 46, L.l. 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 
