28 7 



12 1 6 short dentated, or 30 long and slender gillrakers on 

 the lower part of the anterior arch. 



Rather small fishes, living in rivulets, streams and lakes of 

 Australia, New Guinea and neighbouring islands (Aru-Islands, 

 Waigeu). 



Note. The indo-australian genera and species of Me Ian o- 

 taeniinae are also treated by JORDAN & HUBBS (A mono- 

 graph, review of the family of Atkerinidae, Stanford University 

 Publications 1919). As the authors had not the benefit to see 

 the species themself, their treatement of them is a replica of 

 that of C. T. REGAN. His descriptions are quoted under the 

 genera and species named on the following pages. We there- 

 fore did not think it necessary to quote also the identical 

 names used again by JORDAN & HUBBS. 



Key to the indo-australian genera of 

 Melanotaeniinae. 



I. Scales regularly arranged, 30 44 in a row. between 

 head and caudal, smooth or with faint crenulations. 

 A. Intermaxillaries with an abrupt bent between their 

 horizontal and lateral part. L.I. 30 39. 

 a. Teeth not extending on outside of lips, which 

 are not thickened. Mouthopening rather small, 



not reaching vertical through frontborder of eye. Mclanotaenia p. 287. 

 l>. Teeth extending on outside of lips, which are 

 thickened. Mouthopening comparatively large, 

 reaching to vertical through frontborder of eye 



or nearly so Rhombatractus p. 296. 



/>. Intermaxillaries without an abrupt bent between 

 their horizontal and lateral part. L.I. 40 44. 



a. First dorsal with 4 5 spines. Palate toothless. Centratherlna p. 305. 

 />. First dorsal with one spine and 3 5 soft rays. 



Teeth on vomer Chilatherina p. 307. 



II. Scales irregularly arranged, 55 60 in a row between 

 head and caudal, deeply crenulated along their hind- 

 margin Glossolepis p. 309. 



i. Melanotaenia Gill. 



(GiLL, Proc. Acad. Philadelphia 1862, p. 280; MAX WEBER, Nova 



Guinea V. Livr. 2, 1908, p. 238). 

 Nematocentris Peters, Monatsber. Akad. Berlin 1 866, p. 516. 



