386 LABYRINTHICI. 



with the lower margin serrated ; there are five series of scales be- 

 tween the orbit and the angle of the prseoijerculum. The entire 

 lower margin of the praeoperculum and a part of the sub- and inter- 

 operculum are serrated. The dorsal fin commences on the middle of 

 the distance between the snout and the root of the caudal ; its 

 spines are moderately strong, the length of the third being more than 

 one-half of that of the head. Caudal emarginate : more than one- 

 half of the anal fin is scaly ; it terminates immediately before the 

 caudal. The longest ventral ray extends beyond the extremity of 

 the caudal, and has three rudimentary rays in its axil. Immaculate : 

 back greenish, sides and belly silvery ; the soft dorsal and caudal 

 with brownish dots. 

 Total length six inches. 



5. Osphromenus striatus. 



POsphronemus vittatus, (KuhlSfv. Hass.) Om\ Sf Val. vii. p. 387. 

 Trichopus striatus, Bleek. Verhand. Batuv. Genootsch. xxiii., Labr. p. 11, 

 and Natuurk. Tydschr. Nederl. Iml. 1850, i. p. 106. 



D. I^i. A. ±|. L. lat. 28-30. L. transv. 13. 



The height of the body equals the length of the head, and is one- 

 third of the total (the caudal not included). 



Var. a. 



Body with two brown longitudinal bands. — Java. 



Var. /3. 



Body with four black longitudinal bands. — Borneo. 



Var. y. 



Three blackish bands on each side, the upper with a round spot. — 

 Fresh waters of Siam, 



a-h. Fine specimens. From M. Mouhot's Collection. 



Description. — Head longer than high ; snout of moderate length, 

 longer than the diameter of the eye, which is one-fourth of the length 

 of the head ; cleft of the mouth rather small, with the lower jaw 

 slightly prominent ; both jaws with a band of villiform teeth ; the 

 interorbital space is slightly convex, and as wide as the orbit. Prse- 

 orbital and angle of the praeoperculum serrated. There are three 

 series of scales between the orbit and the angle of the praeoperculum. 

 The distance of the first dorsal spine from the root of the caudal is 

 only one-half, of its distance from the snout ; the spines are rather 

 feeble, the length of the third being one-third of that of the head. 

 The soft dorsal is much produced, like the caudal and the posterior 

 part of the anal. Caudal rounded, not forked, one-third of the total 

 length. Base of the anal scaly. The spine of the ventral is rather 

 strong, and its outer ray is produced into a long filament ; the other 

 rays are well developed. 



There are three blackish longitudinal bands on each side : the 



