1, NOTOPTERirS. 479 



may rank as genera if the second should prove to contain more than 

 one species : — 



a. A dorsal fin. Union of the giU-membranes narrow; branchiostegals 

 from six to nine : Notopterus, p. 479. 



/3, No dorsal fin. Union of the gill-membranes broader ; branchiostegals 

 thi'ee : Xenomystus, p. 481. 



a. Kofopferus. 



1. Notopterus chitala. 



Mystus chitala, Ham. Btich. Fish. Gany. pp. 23G;382; Gray, Ind. 



Zool. c. fig. 

 Notopterus oruatus, Gray, Zool. Misc. p. IG. 



chitala, Gray, I. c. 



macidatus, Valenc. i)i Belany. Voy. Ind. Poiss. pi. 5. fig. 2. 



buchanani, Ci(i\ 4'" ?'«?• xxi. p. 148. 



hypselonotus, Sleek. Verh. Bat. Gen. xxiv. Cliir. p. 27 ; or Nat. 



Tydschr. Ned. Ind. iii. p. (i04; imdiAct. Ac. Cas. Leop.-Carul. xxiv. 



1. Notopt. p. .5.5, tab. 9. 

 lopis, UleeL I. c. 1°, or I. c. 2°, i, p. 423 ; and I. c. 3°, p. GO, tab. 10. 



B. 8-9. D. 9-10. A. 110-125. 



Upper profile of the head concave, its facial portion being pro- 

 duced ; the maxillary extends behind the orbit. Coloration uniform, 

 or with indistinct, irregular, darker cross bands, or with some round, 

 black, ocellated spots along the lower part of the tail. 



East Indies. 



a-d. Adult (35 inches long) and half-grown : stuffed. East India. 



e-/. Half-grown. Siam. Purchased of Mr. Jamrach. 



g. Adult. East-Indian archipelago. Erom Dr. Eleckers Collection 



as tyjie of N. lopis. 

 h. Adult. East-Indian archipelago. Erom Dr. Bleekcr's Collection 



as type of N. hypselonotus. 



2. Notopterus borneensis. 



Notopterus borneensis, IJleel: Verh. Bat. Gen. xxiv. Chirac, p. 26; or 

 Nat. Tydschr. Ned. Ind. ii. p. 437 ; and N Act. Acad. C(fs. Leop.- 

 Carol. xxiv. 1. Notupt. p. 57, tab. 7. 



maculosus, Bleeh. I. c. 1° et 2° ; I. c. 2P, p. 58, tab. 8. 



B. 8. D. 10. A. 125. 

 Upper profile of the head distinctly concave ; the maxillarj* ex- 

 tends to below the posterior half of the orbit. The bones of the 

 lower side of the head finclj' serrated. Coloration uniform, or with 

 small, round, blackish spots on and above the anal fin. 



Borneo and Sumatra. 

 ff. Nine inches long. Borneo. Erom Dr. Bleekcr's Collection. — 



Type of N. borneensis. 

 h. Nine inches long. Borneo. From Dr. Bleekcr's Collection. — 

 Type of N. macuhsits. 



