FISHES FROM ECUADOR AND PERV—STARKS. 



789 



60. ISACIA CONCEPTIONIS Cuvier and Valenciennes. 



Two speciiiieiis from Callao, Peru, in length 233 and 290 mm. respec- 

 ti\'ely. The head i,s contained in entire length to Ixise of caudal 3i 

 times. The eye in head 5i to 5^ times. The vertical limb of the preo- 

 percle is straight, or but little concave. The mandible is a little 

 thicker toward the tip than in /. venusta^ and projects slightl}' more. 

 This character is somewhat more marked in the larger specimens (here 

 drawn) than in the other. The specimens at hand are everywhere 

 darker than in /. venusta, being black above and very dark on sides. 



FUi. 9. — ISACIA CONCEPTIONIS. 



KiG. 10.— ISACIA VENITSTA. 



61. ISACIA VENUSTA, new species. 



Isacia conceptionis Abbott, Proe. Acatl. of Sci. Phil., 1899, p. 350, Callao, Pern. 



Head, 2i to SyV in length to base of caudal; depth 3i to 3i. Eye, 

 4i to 4^ in head; interorbital space, 3| to 4; snout, 3f to 4; maxillary, 

 3| to 4. Dorsal, XIII, 13 or 14; anal, III, 13. Scales, 52 to 54. 



Profile of head and body with the curves moderate and unbroken; 

 the ventral and dorsal outlines similar. Jaws equal, or the lower very 

 slightly projectiag when mouth is closed. Maxillary scarcely reach 

 ing to below front of eye. Teeth in rather broad villiform bands, 



