2O2 HELLER AND SNODGRASS 



POMACENTRUS ARCIFRONS sp. nov. 



pi. vii. 



Type. Cat. No. 6356, Leland Stanford Jr. University Museum. 

 Harrington Island. 



Diagnosis. Profile from snout to front of dorsal regularly arcuate, 

 forehead convex ; least depth of preopercle less than eye, but relatively 

 greater than in P. leucorus or P. redemptus-, interorbital space 

 greater than eye ; upper limb of opercle vertical, rather coarsely ser- 

 rated ; lips orange, contrasting conspicuously in color with the brown 

 color of the head and fore part of the body ; young without spots 

 on the scales, orange posteriorly. 



Description of the Type. Depth of body a little more than one 

 half its length. Profile from tip of snout to front of dorsal steep, 

 regularly curved, thence to tip of soft dorsal, profile nearly straight. 

 Posterior border of soft dorsal receding. Profile of body descending 

 from front of spinous dorsal to caudal. Mouth on a level with upper 

 edge of base of pectoral and lower edge of caudal peduncle. Ventral 

 profile of body regularly curved. Anal fin similar in shape to soft 

 dorsal; caudal forked, the upper lobe the larger. Head three and 

 one third in length ; eye three and two thirds in head ; interorbital 

 space about three in head ; preorbital a little narrower than diameter 

 of eye ; maxillary reaching slightly back of front of eye. Posterior 

 margin of the preopercle vertical with slender serrations. Suborbital 

 with larger, wider, less numerous serrations. Teeth rather firmly 

 fixed, a single row in each jaw, compressed basally, flattened antero- 

 posteriorly at tip; D. XII, 15; A. II, 13. Dorsal spines all about 

 the same length, the first two in head ; median soft rays elongated ; 

 the last shortest ; first anal spine three in second ; second one and two 

 thirds in head. Pectoral wide, fan-shaped, the upper rays longest, 

 slightly shorter than head ; outer angle of ventral prolonged into a fila- 

 ment, about three in length. Scales large, 5-25-10. Lateral line end- 

 ing a little in front of posterior end of soft dorsal ; pores on twenty 

 scales. 



Coloration in Alcohol. Dark brown, with diffusion of orange over 

 posterior parts, color varying greatly in different specimens. All have 

 the fore parts brown and nearly all have the posterior parts orange ; 

 but the proportions of the two colors are very indefinite, some speci- 

 mens being nearly all brown and others almost wholly orange. 



