648 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



D. Ill, 12 or 13, first branched ray I14 i^i total head; A. in, 13 or 

 14+2, first branched ray 2i/^ in head; caudal 4% in rest of body, 

 well forked; least depth of caudal peduncle 2 in head; pectoral 1%; 

 ventral 1%. 



Yellowish, point and top of head and back with dark tips. 

 Opercles silvery. Caudal dusted with black, margin blackish. Fins 

 otherwise hyaline. Length, nearly 90 mm. (Weber and Beaufort.) 



Sumatra, Borneo. 



Genus PELLONA Valenciennes 



Pcllona Valenciennes, Hist. Nat. Poiss., vol. 20, p. (218) 300, 1847. (Type, Pellona 

 orMgnyana Valenciennes, designated by Gill, Proc. Acad. Nat. Sci. Phila- 

 delphia, 1861, p. 38.) 



Ncosteus Norman, Ann. Mag. Nat. Hist., ser. 9, vol. 11, p. 17, 1923. (Type, 

 Pellona ditchela Valenciennes, designated by Norman, Zool. Record, Pisces, 

 1923, p. 25.) 



Edge of upper jaw with small toothed bone (ligament in Ilisha) 

 extending from lateral end of premaxillary to prominent middle of 

 maxillary. Scales usually with 1 or 2 vertical striae, sometimes sev- 

 eral others incomplete. Dorsal origin before anal. 



A small group usually associated with Ilisha but differing chiejfly 

 in the structure of the upper jaw. Norman proposed Neosteus for 

 this group, apparently overlooking Gill's designation of the type of 

 Pellona in 1861. Besides the only Indo-Pacific species described 

 below, Norman admits 7 others, all American. 



PELLONA DITCHELA Valenciennes 



Pellona ditchela Vaxencisnnes, Hist. Nat. Poiss., vol. 20, p. (228) 314, 1847 [on 

 Dltchelee Russell, Fishes of Coromandel, vol. 2, p. 72, pi. 188, 1803 (type 

 locality: Vizagapatam) ]. — Bleekeb, Verb. Batav. Genootsch. (Bengal), vol. 

 25, p. 72, 1853 (reference). — Gunther, Cat. Fishes British Mus., vol. 7, p. 454, 

 1868 (reference).— Day, Fishes of India, pt. 4, p. 644, pi. 165, fig. 5, 1878 

 (Madras, Coromandel) ; Fauna British India, Fishes, vol. 1, p. 381, 1889. — 

 Whitley, Rec. Australian Mus., vol. 16, p. 214, 1928 (Edward Pellew Group, 

 Gulf of Carpentaria). — Fowler, List Fish. Malaya, p. 30, 1938 (reference). 



IlisJia ditchela Fowler, Proc. Acad. Nat. Sci. Philadelphia, 1923, p. 36 (Tanana- 

 rive, Madagascar). 



Neosteus ditchela Noeman, Ann. Mag. Nat. Hist., ser. 9, vol. 11, p. 17, 1923 

 (types of Ilisha hoevenii; East Africa; Indo-Australian Archipelago). — 

 McCrrLLocH, Australian Mus. Mem., vol. 5, p. 41, 1929 (reference). 



f Chipea mclastoma Schneider, Syst. Ichth. Bloch, p. 427, 1801 (type locality: 

 Indian Ocean at Coromandel coast). — GtJNTHER, Cat. Fish. Brit. Mus., vol. 

 7, p. 454, 1868 (copied). 



Pellona melastoma Valenciennes, Hist. Nat. Poiss., vol. 20, p. 308, 1847 (Pondi- 

 cherry). 



Pellona hoevenii Bleeker, Verb. Batav. Genootsch. (Haring.), vol. 24, p. 21, 

 1852 (type locality: Batavia, Java); Nederland. Tijdscbr. Dierk., vol. 2, 

 p. 176, 1865 (Siam).— GiJNTHEE, Cat. Fish. Brit. Mus., vol. 7, p. 455, 1868 

 (type: Amboina ) .— Day, Fishes of India, pt. 4, p. 644, pi. 165, fig. 6, 1878 



