756 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



o'. Teeth on palate granular. 



p\ PsEUDABius. Palatine teeth in 2 groups, begin at front edge of 

 palate and cover most its front surface, patches wider an- 

 teriorly; gill rakers 12 manillensis 



ff'. Ariodes. Palatine teeth in 4 groups. 



IC. Hind patches in broad oval or ellipse, converge behind or 

 parallel, 

 i'. Anterior patches well developed. 

 y\ Forward patches ovate-elliptical, far apart, each of 16 to 

 26 or more teeth ; length parallel to front palate edge ; 

 hind patches far back, elliptical, usually parallel ; oc- 

 cipital process truncate triangle with nearly straight 



sides; gill rakers 12 magatensis 



f. Forward patches ovate, nearly at right angles to anterior 

 palatal edge; hind patches pear-shaped, converging be- 

 hind ; occipital process triangular, elevated along center, 



sides convex ; gill rakers 9 crossocheilus 



i^ Anterior patches very small or rudimentary ; occipital process 



with straight sides ; gill rakers 7 or 8 argyropleuron 



7^^ Hind patches elongate or in narrow oval, end at rear in 

 diverging points. 



fc\ Occipital process ovate or oval, large, elevated, with 

 convoluted rough surface; gill rakers 8 or 9. 



leiotetocephalus 

 fc". Occipital process triangulate, with straight sides; sur- 

 face radially granulate ; gill rakers 12 goniaspis 



Subgenus Tachysurus Lacepede 



TACHYSURUS DISPAR (Her re) 



Arins dispar Hekeb, Philippine Journ. Sci., vol. 31, p. 405, pi. 1, fig. 6 (dentition) 

 1926 (type locality: Paco m-arket, Manila; Leguna de Bay; Pasig River; 

 Quiapo market, Manila; Los Banos) ; Fish. Herre Philippine Exped. 1931, p. 

 22, 1934 (San Fabian ; Augat R. ; Manila ; Leguna de Bay ; Pasig R.) . — Roxas 

 and Martin, Dept. Agr. Comm. Manila, Tech. Bull. 6, p. 44, 1937 (reference). 



Depth 51/^; head 3i/4, width li/2- Snout projects beyond lower 

 lip, broadly rounded; eye 7^3 in head, 2% in snout, 31/5 in inter- 

 orbital; maxillary barbel reaches pectoral base, mandibular reaches 

 gill opening, li/4 in maxillary, mental much shorter; teeth villiform, in 

 slightly curved band, widest at ends, width 5 in its length; lower 

 teeth slightly longer, crescentic band much narrower; on palate 2 

 small, very widely separate, ovate, triangular patches of coarse 

 strong conic teeth; plates on top of head granulose, with broad 

 median fontanel from opposite nostril to occipital process; last 

 bluntly triangulate, sides slightly bowed, densely granulate, hind 

 blunt edge in contact with narrow crescentic, granulose bone at base 

 of dorsal spine; humeral plate small, sharply triangulate, smooth. 

 Gill rakers 7+12, stiff, twice eye. 



Dorsal fin II/3 in head, spine 1%^, front edge granulose, serrate 

 near tip and serrate behind ; adipose fin base 1% in anal base ; A. 18 ; 



