284 FEESHWATEE FISHES COLLECTED IN DUTCH NEW GUINEA. 



Depth of body 2^ to 3^ in the length, length of head 3J to 4. Snont as long as or 

 shorter than distance from its tip to end of maxillary, 1 to 1^ as long as diameter of 

 eye, which is 3 to 4|- in the length of head ; interorbital width 2^ to 3 in the length 

 of head. Cheek with 2 or 3 series of scales. 12 to 15 gill-rakers on lower part of 

 anterior arch. 33 to 39 scales in a longitudinal series, 11 to 13 in a transverse series, 

 15 to 20 in front of spinous dorsal fin. Dorsal (IV) V-VI, 1 11-16 ; origin of spinous 

 dorsal a little in front of, above, or behind that of anal ; first spine f to | length of 

 head. Anal I 19-24 (26). Pectoral as long as or a little longer than head without 

 snout. Caudal peduncle as long as or a little longer than deep. Silvery ; back 

 olivaceous ; scales often with dark edges and pale centres ; sometimes dark longitudinal 

 stripes between the series of scales ; often a blackish lateral band from snout through 

 eye to base of caudal fin ; this may be developed only posteriorly ; sometimes a blackish 

 blotch on the side below the band ; vertical fins reddish, darker at the base. 



New Guinea ; Aru Islands ; Waigiou. 



Here described from a large series of specimens, up to 140 mm. in total length, 

 comprising six from the Mimika Eiver (_B. 0. TI. Expedition'), the types of B. weberi 

 from the Fly Eiver (Barton), several from the Aru Islands, including co-types of 

 B. senckenlergianus, and examples sent by P]-ofessor Max Weber as B. ajfinis, B. kochii, 

 and B. catherince. 



In the Mimika River examples I count D. V-VI, I 11-13, A. I 21-23 ; in those, 

 from the Aru Is., D. V-VI, I 12-15, A. I 19-23 ; in those from the Fly K, D. V-Vl, 

 I 12-14, A. I 22 ; in two from the Lorentz R. {B. kochii), D. V. I 12-13, A. I 22-28 ; 

 in one from Njao [B. affinis), D. VI, I 16, A. I 22 ; and in two from Waigiou 

 {B. catherince), D. V, I 11-12, A. I 19. 



The specimens figured are from the Mimika River, and show well the difi'erences 

 characteristic of young and adult fishes. 



2. Rhombosoma lorentzii. 



Rhomb atr actus lorentzii M. Weber, Nova Guinea, v. 1907, p. 236, pi. xi. fig. .2, and ix. 1913, 

 p. 564. 



Depth of body 2^ in the length, length of head 3|. Snout as long as distance from 

 its tip to end of maxillary, 1| diameter of eye, which is 4^ in the length of head ; 

 interorbital width 2f in length of head. Cheek with 4 series of scales. 16 gill- 

 rakers on lower part of anterior arch. 38 scales in a longitudinal series, 13 in a trans- 

 verse series, 19 in front of dorsal. Dorsal (IV) V (VI), I 16 (13-17) ; first spine ^ the 

 length of head. Anal I 27 (23-30) ; origin well in advance of that of spinous dorsal. 

 Caudal peduncle deeper than long. Silvery ; back darker. 



Northern New Guinea. 



Here described from a single specimen, 130 mm. in total length, from the Sermowai 

 River, received from Prof. Max Weber. 



