PHILIPPINE MACKOUROID FISHES GILBERT AND HUBBS. 429 



d 2 . No round blackish spot above and behind the pectoral tin ; sec- 

 ond dorsal fin as high anteriorly as the anal. 

 o. 1 Snout, 2.2 in head ; orbit, 3.7 ; least interorbital width, 1.2 in 

 orbit ; interdorsal space two-thirds as long as the first dorsal 

 base ; body conspicuously mottled anteriorly, barred posteri- 

 orly ; one species from northern Luzon and Formosa. 



cingulatus. 



o\ Snout, 2.4 in head ; eye, almost 3 in head ; interorbital width 



1.8 in orbit ; interdorsal space one-third as long as base of 



first dorsal ; body without dark markings ; one Australian 



species innotabilis. 



Spinules on scales on strongly divergent carinae, the lateral ones of 

 which are often weaker than the median ; anus always immediately 

 before anal fin ; second dorsal spine equal to, or less than, the 

 postrostral length of head;Jx)dy usually without definite dark mark- 

 ings; an apparently natural group of species, with its center of dis- 

 tribution in the East Indies oxymacrurus. 



i 1 . Orbit very large, longer than the postorbital length of head ; 3 to 5 

 spinous ridges on scales; distance from anus to ventral greater 

 than length of orbit; snout comparatively short; one Chilean 



species ehilensis. 



; 2 . Orbit moderate, shorter than postorbital length of head ; Indo- 

 Asiatic species. 

 &\ Snout less than twice as long as orbit in adult. 

 c\ Snout without an acuminate tip ; sides of snout very convex, the 

 width between its anterolateral angles 0.75 or 0.8 1 in length 

 before that point; scales on ridges of head, especially on in- 

 , fraorbital ridge, enlarged and strengthened much more than 

 usual in this subgenus; flesh soft {platorhyncJius group). 

 d\ Underside of head and lower part of nasal fossa scaled ; 5 to 7 

 strong spinous carinae on scales of body ; scales from top of 

 head usually with a single strong median keel ; 4| r<5ws of 

 scales in a series between lateral line and origin of second 

 dorsal ; infraorbital ridge scales in a double series on sub- 

 orbital and preopercular regions, that is, behind middle of 

 eye ; area between ridge and orbit covered by small . scales ; 

 orbit 1.2 to 1.25 in postorbital length of head ; least inter- 

 orbital width shorter than length of orbit, 1.5 to 1.7 in post- 

 orbital ; preoral length of snout, 2.9 to 3.3 in head ; length of 



maxillary, 3.S to 4.1 J platorhyncJius. 



d 2 . Underside of head and nasal fossa completely naked ; scales 

 from top of head usually with several carinae. 

 e\ Four to seven strong spinous carinae on scales of body ; 

 4J rows of scales between lateral line and origin of second 

 dorsal; infraorbital ridge scales in a double series on 

 preopercular, suborbital, and posterior part of preorbital 

 regions, that is, behind front of eye; area between ridge 

 and orbit naked; orbit, 1.15 in postorbital length of head; 

 least interorbital width decidedly shorter than length of 

 orbit, 1.5 to 1.6 in postorbital ; preoral length of snout, 

 2.9 .to 3.05 in head ; length of maxillary, 3.9. 



aeantholepis. 



1 0.85 in a young specimen of C. aeantholepis 60 mm. kng to anus. 



