FISHES FROM PERU HILDEIJRAND AND BARTON 



principal differences among tlie three species of this genus, recog- 

 nized in these pages, are shown in the parallel comparison that follows. 

 The name angusttceps was suggested by the rather narrow com- 

 pressed head. 



equatorialis 

 Teeth in jaws com- 

 pressed, with broad 

 bases, the posterior 

 margin of each tooth 

 always and the an- 

 terior margin gener- 

 ally serrate. 



Skin on body mostly 

 smooth, wrinkles if 

 present not extending 

 on dorsal fin. 



Head and trunk defi- 

 nitely shorter than tail, 

 length anterior to vent 

 2.3 in total length. 



Head large, its length to 

 gill opening 3.0 in 

 length anterior to vent, 

 6.8 in total length. 



Snout about square in 

 cross section, 6.0 in 

 head. 



Origin of dorsal well in 

 advance of gill slit, 

 its distance from tip of 

 snout 4.1 in length an- 

 terior to vent, 9.4 in 

 total length. 



Dorsal fin rather low, 

 its height nowhere 

 exceeding length of 

 snout, not enveloped 

 in thick skin. 



Head and body with 

 pale spots, very small 

 (dots) on head, be- 

 coming larger poste- 

 riorly, all smaller than 

 eye. 



serratidens, new 

 species 



Teeth in jaws com- 

 pressed, with broad 

 bases, each margin of 

 tooth definitely ser- 

 rate. 



Skin on body and fins 

 smooth. 



Head and trunk about 

 equal to length of tail. 



Head small, its length to 

 gill opening 4.25 in 

 length anterior to vent, 

 8.3 in total length. 



Snout rather broader 

 than deep in cross sec- 

 tion, 5.1 in head. 



Origin of dorsal little in 

 advance of gill slit, its 

 distance from tip of 

 snout 4.2 in length an- 

 terior to vent, 8.2 in 

 total length. 



Dorsal fin very low, its 

 greatest height about 

 half length of snout, 

 enveloped in thin skin. 



Head and body with 

 much larger pale spots, 

 many of them equal to 

 or larger than eye. 



angusticeps, new 

 species 



Teeth in jaws little com- 

 pressed, with minute 

 serrae, present only at 

 base of most of the 

 teeth. 



Skin on body very 

 wrinkled, the wrinkles 

 extending on dorsal 

 fin. 



Head and trunk about 

 equal to length of tail. 



Head moderately large, 

 its length to gill open- 

 ing 3-25 in length an- 

 terior to vent, 6.4 in 

 total length. 



Snout a little deeper 

 than broad in cross 

 section, 6.1 in head. 



Origin of dorsal far in 

 advance of gill slit, its 

 distance from tip of 

 snout 4.9 in length an- 

 terior to vent, 9.6 in 

 total length. 



Dorsal fin high, its 

 greatest height about 

 equal to length of 

 snout and eye. 



Head and body un- 

 spotted, but with dark 

 lines in the furrows of 

 the wrinkled skin. 



