484 CALIFORNIA ACADEMY OF SCIENCES. 



Family CH^:T0D0NTID^. 



184. Chaetodon humeralis Giinther. 'Muneca. 

 Exceedingly common in the Astillero, especially on 



rock bottom. It reaches a length of about six inches, 

 and is seldom used as food, although its striking color, 

 which has suggested the name of Afuheca or doll, makes 

 it an object of attention. 



185. Pomacanthus zonipectus (Gill). Mojarra de las 

 PiEDRAS. (Pomacanthus cresceiitalis Jordan & Gilbert. ) 



Not uncommon in rocky places about Mazatlan. Two 

 specimens were obtained by us with dynamite about the 

 wreck of a French man-of-war in the Astillero. Smaller 

 specimens, very different in color from the adult, and 

 hence taken by us to be a distinct species (Pomacanthus 

 crescentalis), were obtained by Dr. Gilbert at Mazatlan 

 and Panama. The original type of the species was* taken 

 at San Salvador by Capt. Dow. 



Description of the adult of Pomacanthus zonipectus: 



Head 3^; depth \y^; D. XI, 23; A. Ill, 20. Pre- 

 opercular spine longer than eye, 3^ in head. Last dor- 

 sal spine i^ in head. Longest dorsal ray \ longer than 

 head, falcate. Anal rounded. Caudal short, truncate, 

 154^ in head. Pectoral moderate. Ventral very long, ^ 

 longer than head. Preorbital equals maxillary, i}^ in 

 head. Eye 3^ in head. Interopercle with one stoutish 

 spine. Preopercle very finely serrate. A large hump 

 at nape in adult. 



Dark gray, blackish posteriorly, most scales with black 

 centers; edges of scales, bright sky blue in life, espe- 

 cially posteriorly; a triangular bronze yellow patch in 

 front of line connecting pectorals with ventrals, then a 

 dil^use blackish bar from front of dorsal along region be- 

 hind pectorals to ventrals, then a broad curved bar of 



