442 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



CHEILODIPTERUS NIGROT.ffi;NIATUS Smith and Radcliffe, new species. 

 Plate 37, fig. 3. 



Dorsal vi-i,9 ; anal ii,8 ; scales 3 + 5-25. 



General form elliptical; head 2.60, long, depressed; body slender, 

 cylindrical, not strongly compressed, depth 4; caudal peduncle com- 

 pressed, depth 2.90, length 1.66; eye 3.57; snout 3.67, nearly as long 

 as eye; mouth nearly horizontal; maxillary 1.89, long, reaching verti- 

 cal from posterior margin of eye; interorbital 5.10, narrow, flat, 

 smooth; margin of preopercle smooth; mandible with a row of slender 

 unequal canines; upper jaw with a row of unequal canines anteriorly, 

 widening out into a band of cardiform teeth, these becoming smaller 

 villif ormlike ; a single row of rather stout teeth on the vomer; a similar 

 row of smaller teeth on palatine bones; peritoneum silvery white; 

 position of vent cephalad, much nearer base of ventrals than origin of 

 anal, its distance from anal 1.65 in distance from anal to base of 

 ventrals; scales large, regular, ctenoid. 



Dorsal spines feeble, first long, nearly as long as second, second and 

 third subequal, 2.36; anterior second dorsal rays longest, 2.10, mar- 

 gin nearly truncate; caudal short, broad, forked; anal similar to 

 second dorsal, 2.30; ventrals 2.27; pectorals 2.17. 



Color in alcohol : Ground color silvery white tinged with yellow and 

 dusky points; four dark longitudinal stripes, the first sepia, from inter- 

 orbital along median line of back to base of caudal; the second Van- 

 dyke brown, from above eyes to upper caudal lobe; the third clove 

 brown, encircling tip of snout, backward through middle of eye to 

 end of lateral line; fourth almost black, from chin under eye, through 

 base of pectoral to inferior caudal base; stripes broken up on base of 

 caudal into irregular spots; interspaces wider than stripes, mesially 

 washed with silver white; margins and articulations of caudal rays 

 outlined with brown; other fins dusky. 



Color in life: Stripes black, interspaces and lower surface dusky 

 wliite; on head interspaces are bright yellow, area behind eye to second 

 dorsal also yellow; first dorsal hyalin; second slightly dusky in front; 

 caudal dusky, stripes on sides being broken into dots at base; other fins 

 dusky or hyalin. 



Type. — Cat. No. 70252, U.S.N.M., a specimen 8 cm. in length, 

 from coral reefs on the northeast shore of Sacol Island, east of 

 Zamboanga. 



In this species and the one wliich follows the vent is nearly as far 

 forward as in Acropoma. It agrees, however, in all essential char- 

 acters with CJieilodipterus. 



There are four examples in the collection, 7.5 to 8 cm. long, two 

 from Sacol Island, one from Tutu Bay, Jolo, and one from Gomomo 

 Island. 



