297 



process, which is about 3 times longer than broad, with the 

 borders nearly parallel, its truncate hindborder touching the 

 broad, granular, somewhat horseshoe-shaped basal bone of the 

 dorsal spine. Humeral process triangular, rather short. Dorsal 

 profile sloping down in a straight line to the very broad, 

 rounded snout, the gape of which is i 3 / 4 the length of the head. 

 Eye n, with a free orbital margin, situated in the anterior ! / 3 

 of the head, about 6 times in the flat interorbital space, 2 J / 2 in 

 snout. Barbels short, the length of the maxillary ones in our 

 specimen (650 mm.) equal to the distance between the front- 

 border of snout and the hindborder of the eye; mandibulary ones 

 about of equal length. Height of dorsal i 3 / 5 in length of head, 

 its spine i 3 / 4 in same length, rugous in front, dentated behind. 

 Base of adipose fin nearly equal to 

 that of the dorsal, nearly 4 times 

 in its distance from that fin, above 

 hinderhalf of anal, the free border 

 of which is slightly concave. Ven- 

 trals touching the anal, shorter Fig. 121. Arius latirostris Macl. 

 than the pectorals, about as long ^ f u PP er J aw and P alate > 



5 about 1/2- 



as the dorsal; the pectoral spine 



equal to l / 2 length of head, rough in front, nearly smooth behind. 

 Caudal deeply forked, lobes pointed. Villiform teeth in the 

 upper jaw in a rather broad band, the two halves of which 

 meet at an obtuse angle; the two mandibulary bands are 

 curved, those on the palate in a broad, curved band, consisting 

 of two median square patches, separated by a narrow inter- 

 space, laterally contiguous with the lateral patches, which are 

 much broader than long. 12 stiff, flattened, triangular gillrakers, 

 about half as long as the eye. Dark brown above, white below, 

 dorsal, adipose fin, anal and caudal darkish. Ventrals and 

 pectorals yellowish. Pectorals with a dark spot on inner half 

 of upper surface. Length about 650 mm. 



Habitat: South New Guinea (Goldie river, Lorentz river!). 



In fresh water. 



17. Arius Stirling! Ogilby. 



Arius stirlingi Douglas Ogilby, Proc. Linn. Soc. N. S. Wales, XXIII. 1898, 



p. 281. 



Nemapteryx stirlingi Douglas Ogilby, Ann. Queensl. Mus. N. 9, 1908, p. 10. 

 Arius stirlingi Max Weber, Nova Guinea, IX. livr. 4. 1913, p. 540. 



