PHILIPPINE MACROUROID FISHES GILBERT AND HTJBBS. 441 



spreads out. The region immediately around the base of the first 

 dorsal, the axillary region of the pectoral, and the dorsal spine, are 

 all black; the ventrals are sometimes blackish near their bases, and 

 near the tips of their rays ; elsewhere the fins are light dusky. 



G. quincunciatus differs quite widely from G. argent atus, although 

 the two species obviously belong to the same group. The scales are 

 larger in quincunciatus, being in but four, instead of five or six, rows 

 between the lateral line series and the origin of the second dorsal 

 fin ; the underside of the head is completel} 7 scaled, instead of being 

 wholly scaleless, except for a definite small anterolateral patch; the 

 anterolateral region of the snout above is almost wholly scaled, in- 

 stead of being mostly naked ; the spinules on the scales of the head 

 are weaker; the gular membrane is punctate, rather than trans- 

 versely striate; the anus is located farther forward, its distance 

 from the ventral fin being contained 2.4 to 3.2 times in the head 

 (rather than from 1.8 to 2.3 times) ; its distance from the isthmus is 

 contained from 1.32 to 1.6 times in the head (rather than from 1.15 

 to 1.32 times) ; the barbel is usually longer,' being contained from 

 2.3 to 3.0, instead of from 2.6 to 4.2 times in the postorbital ; the snout 

 is usually longer, its preoral length being contained 2.3 to 2.55 times 

 in the length of the head, instead of from 2.4 to 2.8 times. G. quin- 

 cunciatus appears to be intermediate in its relationships between the 

 preceding species, G. argentatus, and the one next to be described, 

 G. thompsoni. An analysis of the three species is given in the key, 

 and another after the description of G. thompsoni. Of the three 

 forms, G. argentatus apparently attains the largest size. 



Table of measurements in hundredths of length to anus. 



'A pseudocaudal developed. 



(quincunciatus, in reference to the quincunx arrangement of the 

 spinules on the scales.) 



