250 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



warts. Gill-openings not continued forward to below the eye, the mem- 

 branes joined to the isthmus for a distance equal to one-third the width of 

 the mouth. 



Pectorals rounded, the first ray not produced ; origin of dorsal in front 

 of the vent, but some distance behind the ventrals, equidistant from tip of 

 snout and tip of caudal, its last ray over the last ray of the anal. Caudal 

 long, truncate. Anal short and high, its height about equal to the length 

 of the caudal, its distance from the base of the caudal 3f in the length. 

 Origin of the ventrals equidistant from tip of snout and base of caudal, 

 their tips reaching beyond the vent. 



Back and sides marbled with light and dark brown ; fins pale, immacu- 

 late. 



Head 51 (6| in the total) ; depth yi ; D. 15 ; A. 9. This account is 

 based on a specimen in the Museum of Comparative Zoology. 



12. Hatcheria patagoniensis Eigenmann sp. nov. 



(Plate XXXIII, Fig. 2 ; and Plate XXXIV, Figs, i and la.) 



Type: A specimen ii8 mm. long. Rio Blanco, base of Andes. Lat. 

 47° 30' S. ; long. 72° W. Hatcher, collector. 



Cotypes, 8 specimens, 96-113 mm. 



Elongate, slender ; head, 5 ; depth 8; caudal peduncle slender, its depth 

 nearly 3, in the head, about 4 in its length ; upper maxillary barbel reach- 

 ing pectoral, lower to margin of interopercle, a broad lobe of skin join- 

 ing base of lower maxillary barbel to the lower lip ; snout pointed, mouth 

 narrow, its width 3^ in head, equal to interorbital ; nasal barbels reach- 

 ing beyond eye ; width of head but little less than its length ; greatest 

 width of body behind the pectorals, 1.6 in the length of the head. Gill 

 opening not extending forward to below eye ; origin of dorsal equidistant 

 from tip of caudal and posterior nares ; base of dorsal equal to its dis- 

 tance from the caudal, its free surface emarginate, the anterior lobe rounded, 

 the posterior pointed ; beginning of last third of dorsal not much more 

 than half as high as anterior lobe. Caudal moderate, emarginate, its lobes 

 rounded, .8 of the length of the head. Anal broadly rounded, its last ray 

 about under last ray of dorsal. Ventrals broad, their middle under origin 

 of dorsal, i^ in head, equal to height of anal. Base of pectoral hori- 

 zontal, closing edgewise to body, its lower part folded when appressed ; 



