780 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Back brown, sides and lower surfaces paler to whitish, with silvery 

 w^hite reflections, especially side of head. Dusky brown median or 

 axial longitudinal band, indistinct on head, contrasted on body. 

 Blackish triangle from dorsal base joins dark lateral band with its 

 apex below dorsal. Barbel whitish. Iris whitish and gray. Fins 

 all pale, upper and lower caudal edges dusky brown. 



Busuanga Island, Philippines. 



2 examples. Pangauron River, Port Caltom, Busuanga Island. December 16, 

 1908. Length, 120-144 mm. Agrees with Herre's account, his 3 specimens 

 young or only 55-85 mm. 



Genus MANDIBULARCA Herre 



Mandibularca BteBBE, Proc. Pan Pacific Sci. Congr., Australia, vol. 2, 1923, p. 

 1568, 1924. (Type, Mandibularca resinus Herre, orthotypic.) 



Body oblong, rather deep, more or less compressed, strongly so 

 posteriorly, with broad rounded ventral surface. Head rather large, 

 little compressed. Snout short, broad, blunt, without pores or tuber- 

 cles. Eye small, anterior. Mouth rather small, terminal, slightly 

 oblique, with short protractile upper lip and thin, elongated, curved, 

 spatula-shaped lower jaw extending upward around mouth to upper 

 profile of snout. Upper lip wide, curtainlike, lower thin and usually 

 absent on mandible tip. Rostral and maxillary barbels present. Gill 

 membranes united to isthmus opposite preopercle. Gill rakers 7 to 

 15, short. No pseudobranchiae. Pharyngeal teeth 2, 3, 5-5, 3, 2. 

 Scales rather large, with longitudinally radiating striae. Lateral 

 line complete, median on caudal peduncle, tubes simple. Dorsal 

 begins before ventrals, with scaly basal sheath, 4 front rays spinous 

 with last jointed but not serrated and rays 8. Anal rays 5. 



One species in the Lanao Plateau of Mindanao. Known by its 

 elongate, upward-curved, and peculiarly shaped lower jaw. 



MANDIBULARCA RESINUS Herre 



Manditularca resinus Herre, Proc. Pan Pacific Sci. Congr., Australia, vol. 2, 

 1923, p. 1568, 1924 (type locality: Angus River, Lake Lanao, Mindanao) ; 

 Philippine Journ. Sci., vol. 24, p. 273, pi. 1 (rapids of the Angus; 

 "Lake Lanao"), p. 705, 1924 (reference). — Roxas and Martin, Dept. Agr. 

 Comm. Manila Tech. Bull. 6, p. 44, 1937 (reference). 



Depth 3 to 31^ ; head 3^10 to 41/10. Snout 31/5 in head from snout 

 tip; eye 5%, 1% in snout, l^o to 2 in interorbital ; maxillary nearly 

 reaches front eye edge, length 3^4 ^^ head ; barbels subequal, % to 1 

 in eye ; mouth with narrow, concave, upward curving, fleshless more 

 or less spatulalike mandible, wide lower part fitting over closed 

 mouth and narrower upper part curves over into space between 

 premaxillaries so tip extends almost to or flush with upper profile of 

 snout ; interorbital wide and nearly or quite jfjat. 



