o 



EIGENMANN: THE PYGIDHD^E, A FAMILY OF SOUTH AMERICAN CATFISHES. 283 



hb. Origin of dorsal equidistant from tip of caudal and occiput. 



d. Last anal ray under the dorsal; D. 17 3. titcombi Eigenmann. 



ill]. Last anal ray behind the last dorsal ray; D. 14. . . .4. areolata (Cuvier & Valenciennes). 

 aa. Dorsal with twenty-one rays; anal entirely under the dorsal. 



e. Ventrals nearer tip of caudal than snout 5. burmeisteri (Berg). 



ee. Ventrals nearer snout than tip of caudal 6. macraei (Girard). 



1. Hatcheria patagoniensis Eigenmann. 

 Hatcheria patagoniensis Eigenmann, Reports Princeton Univ. Exped. Patagonia, 

 III, 1909, p. 250 (Rio Blanco, at base of Andes, latitude 47° 30', longitude 72 

 W. ; the southernmost record of the family); I. c, 1910, p. 399. 

 Habitat. — Eastern slope of the Andes between latitudes 47° 30' and 31° 30'. 

 Mr. Haseman collected the following specimens : 



7084, C. M., two, 66 and 82 mm. San Juan, Argentina. Feb. 25, 1909. 



7085, C. M., six, 34-77 mm. San Juan, Argentina. Feb. 26, 1909. 

 11370 and 11371, I. U. M., four, paratypes, 94-120 mm. Rio Blanco; Hatcher. 



,-*<** 



Fig. 3. Hatcheria patagoniensis Eigenmann. From a paratype in Indiana University. 



Head 5; depth 8; D. (13) 15; A. 6. Elongate, slender; caudal peduncle slender, 

 its depth nearly three times in the head, about four times in its length; upper 

 maxillary barbel reaching pectoral, lower maxillary barbel reaching to margin of 

 interopercle ; a broad lobe of skin joining base of lower maxillary barbel to the lower 

 lip; snout pointed, mouth narrow, its width 3.5 in head, equal to interorbital; 

 nasal barbels reaching 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 distance 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, 1.5 in head, equal to height of anal. Base of pectoral 

 horizontal, closing edgewise to the body, its lower part folded when appressed, its 

 first ray sickle-shaped, slightly prolonged. Dark yellowish, more or less regularly 

 spotted with darker; dorsal, caudal, and pectorals irregularly blotched with black. 



