172 



MEMOIRS OF THE CARNEGIE MUSEUM. 



(4) Eigenmannia troscheli (Kaup). 



Snout short; minute teeth in patches in both jaws; size small, not exceeding 

 250 mm. 



The stomach of but a single specimen 180 mm. long was examined. It came 

 from San Joaquim and contained twenty-nine Copepoda, seventeen Cladocera, 

 three dipterous larvae and one Hydrachnid. This food is of the same type as that 

 taken from the two preceeding species of this genus. 



(5) Hypopomus brevirostris (Steindachner) and (6) Hypopomus artedi (Kaup). 



These two species are so similar that they will be considered together. Snout 

 short, somewhat pointed; teeth wanting; mouth small; caudal appendage moderate 

 to long; size small. 



Hypopomus artedi (Kaup). 



Hypopomus brevirostris Steindachner. 



(7) Steatogenys elegans (Steindachner) . 



Head chubby; snout short and blunt; mouth small; a cylindrical filament in a 

 groove on each side of the mental region; size small. 



This species was of particular interest because of the pecuUar mental filaments. 

 The stomachs of the specimens examined contained a large number of small annelids. 

 These worms are small mud-inhabiting Oligochseta. The contents of the three 

 stomachs are tabulated here : 



