136 BULLETIISr 95, UNITED STATES NATIONAL MUSEUM. 



Family SCORPAENIDAE. 



THE BOCKFISHES. 



KEY TO GENERA. 



a\ Dorsal XIII, 14 Sebastichthys, p. 136. 



a\ Dorsal XII or XIII, 10. 



5*. Pectoral with some of its median rays more or less branched. 



Scorpaena, p. 137. 

 6'. Pectoral rays all simple ; head more or less scaly, the scales ctenoid. 



Pontinus, p. 138. 



Genus SEBASTICHTHYS Gill. 



KEY TO SPECIES. 



a\ D. XIII, 14 ; A. Ill, 7 ; gillrakers 9+21, longest 2.37 in eye — chamaco, p. 136. 

 al D. XIII, 13 ; A. Ill, 6 ; gillrakers 10+18, longest nearly as long as pupil. 



darwini, p. 137. 

 162. SEBASTICHTHYS CHAMACO. new species. 



CHAMACO. 

 Plate 12. fig. 3. 



Six specimens, field Xos. 504, 545-549, 18.5-24.8 cm. long, from 

 Mollendo. 



Type.— Cat. No. 77621, U.S.N.M. (field No. 548), a specimen 35 

 cm. long, from Mollendo. 



Head 2.4 in length ; depth 2.83 ; eye 4.52 in head ; snout 3.9 ; inter- 

 orbital 6.61; maxillary 2.02; fourth dorsal spine highest, 3.24; sec- 

 ond anal spine longest and strongest, 2.77 ; height of anal rays 2.45 ; 

 pectoral 1.36; 10 lower pectoral rays simple, thickened; D. XIIT, 14; 

 A. Ill, 7; scales about 48, 38 pores; accessory scales numerous on 

 back to level of base of pectoral, below that not nearly so numerous ; 

 gillrakers 9+21 ; comparatively short and stout, longest 2.37 in eye ; 

 lower jaw projecting; preopercle with five stout spines, notchings 

 very distinct; nasal, preocular, supraocular, postocular, tympanic 

 and parietal spines strong; opercular, suprascapular and scapular 

 spines smaller. 



Dorsal spines low, shorter and more slender than the second anal 

 spine; caudal rounded; ventrals reaching just behind anus, pectoral 

 longer, reaching to middle of space between anus and origin of 

 anal. 



Color in alcohol, back reddish brown, becoming silvery gray be- 

 low ; maxillary with a dark reddish brown stripe in center ; another, 

 wider, parallel with preopercle, just above maxillary; indistinct 

 traces of two more behind eyes; five dark reddish brown saddles on 

 back scarcely reaching lateral line; the first at origin of dorsal; 

 second under fifth to sixth dorsal spines; third under ninth to 



