204 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



Scales small ; those along base of vertical fins not enlarged ; spi- 

 nules curved, siiberect, in quincunx order, 10 to 15 on each scale on 

 sides of trunk; scales of head irregular, their boundaries rather 

 difficult to determine, their spinules erect, becoming stronger on 

 snout, but there are no spinous tubercles; under side of head com- 

 pletely scaled; gular and branchiostegal membranes, and anterior 

 part of mandibles, naked ; inner edge of shoulder girdle completely 

 naked. Lateral line with a very short anterior arch, one-fourth as 

 high as long, its length 2.25 in head. 



Distance from occiput to origin of dorsal 2.15 in head. First dorsal 

 spine broadly triangular, compressed, sharp, with an indistinct lon- 

 gitudinal groove; the second spine 1.6 in head, its anterior edge 

 trenchant, armed with strong, widely spaced serrations, 6 on proxi- 

 mal two-thirds of spine, about 10 in all; last four dorsal rays un- 

 branched ; length of first dorsal base half the interdorsal space, and 

 equal to distance between lateral and terminal angles of snout; sec- 

 ond dorsal low. Origin of anal slightly behind vertical from end of 

 first dorsal. Pectoral pointed, 1.95 in head, the rays slender ; base of 

 pectoral in front of origin of dorsal. Ventral small, with six weak 

 rays, the outer one with a short slender filament which reaches to 

 anus; ventral inserted anterior to pectoral and anterior to end of 

 opercle. 



Distance from center of anus to origin of anal less than usual in 

 Lionvrus, being only half the distance from the anus to base of 

 outer ventral ray. Anus surrounded by a black naked area, two- 

 thirds as long as orbit ; no other naked areas on breast. 



Color in alcohol light brown on back and sides, shading into bluish 

 black on belly; head gray, with a large blackish opercular patch; 

 branchiostegal membranes black, without a light inner margin ; gular 

 membrane and lips blackish; lining of buccal, branchial, and ab- 

 dominal cavities black. 



L. cetonuropsis differs from Z. parvipes in the shorter dorsal spine 

 (length 0.51 of length to anus, instead of 0.58 to 0.61), with fewer 

 stronger serrations; the much lighter color, especially of the head 

 and fins, which are pale instead of dusky; the weaker spinules on 

 the scales; the somewhat stronger dentition; the shorter, blunter 

 head; the narrower suborbital (0.115, instead of 0.13 to 0.16 of length 

 to anus). These differences have been verified in each of the six 

 Philippine specimens of L. parvipes. 



