THE GYMNOTID EELS OF TROPICAL AMERICA. 125 
The following is extracted from Steindachner’s original account. 
“Snout 3 in the head; eye 7.5 to 10.5 in the head, 2 to almost 4 in the snout, 
depth of the head about 1.4 (more than 1.3) in the length of the head; head 9.5 
to 11 in total length. 
“Kye with a free lid, its diameter in young individuals twice the interocular 
distance, in old specimens about three times the interocular. 
“Anal begins slightly in front of the vertical from the base of the pectoral and 
contains more than three hundred rays. 
“The head of this species is noticeably deeper, the snout shorter in profile and 
more strongly arched than in Sternopygus carapo = (Sternopygus macrurus).” 
It seems quite probable that this species may be but a variety of Sternopygus 
macrurus. 
Distribution: Middle Amazons and Rio Madeira; north coast of Brazil. 
TV. EI1GENMANNIA Jordan and Evermann. 
Sternopygus MiuiEeR AND TroscHEL, Hore Ichthyol., III, 13 (Species). 
Cryptops E1GENMANN, Ann. N. Y. Acad. Sci., VII, 626 (humboldtii). (Preoccupied.) 
Eigenmannia JORDAN AND EvERMANN, Fishes North and Mid. Amer., I, 341, 1896 
(Substituted for Cryptops). 
Type, Sternopygus humboldtii Steindachner. 
Distinguished from Sternopygus by the absence of a free orbital margin. 
With fontanels; no caudal; snout short. Size moderate, not exceeding 400 mm. in 
length; body elongate and compressed; maximum depth and thickness in the 
region of the pectorals; head moderate to small, and rather short; gape small, 
curved downward and back; jaws equal, the lower included on the sides; teeth in 
two lateral patches in the lower jaw and two almost confluent median patches in 
upper jaw; mouth rather small; eyes medium, covered by a transparent membrane. 
Seales cycloid; lateral line complete. Origin of anal back of the vertical from the 
origin of the pectorals; caudal appendage moderate to quite long. 
Fia. 4. Higenmannia virescens (Valenciennes). 
