MxV.STACEMBELUS. • 137 



28. MASTACEMBELUS STAPPERSII. 

 Boiileng. Rev. Zool. Afr. iii. 1914, p. 446. 



Depth of body 11 to 12 times in total length, length of head 6 to 7 

 times. Vent nearly equally distant from head and from caudal, its 

 distance from head 2^ to 2f times length of latter. Snout 2 to 2^ times 

 as long as eye, ending in an appendage which is about as long as eye ; 

 mouth extending to below anterior border of ej'e ; no prseorbital or 

 prseopercular spines. Dorsal XXXII-XXXTII 80-83 ; distance be- 

 tween first spine and head about f length of latter. Anal III 85-88. 

 Caudal rounded. Pectoral nearly } length of head. Scales very small, 

 22 or 23 between origin of soft dorsal and lateral line, which is very 

 indistinct. Back pale brown or yellowish, with or without a series of 

 large dark brown spots, the pale colour separated from the dark brown 

 of the sides by a blackish-brown lateral band, extending to the tip of 



Fijr. 91. 



MastacemhehiS stappersii. 

 Type. |. 



the snout and passing through the eye ; dorsal brown and anal whitish 

 with a dark brown longitudinal streak, or both fins whitish with a basal 

 series of large dark brown spots. 



Total length 155 millim. 



Lake Mweru and rivers of Katanga (Lubumbashi R. and Luapula R.). 

 — Types in Congo Museum, Tervueren. 

 1-2. Young, types. Lubumbashi E., near Elisabetliville. Dr. L. Stappers (C). 



29. MASTACEMBELUS TRISPINOSUS. 

 Steind. Anz. Ak. Wien, 1911, p. 529, and Sitzb. Ak. Wicn, cxx. 1. 1911, p. 118;} 

 Depth of body about 12 times in total length, length of head 7 times. 

 Vent nearer base of caudal than end of snout. Snout 3 times as long 

 as eye, ending in an appendage which measures If times diameter of 

 latter ; mouth not extending to below anterior border of eye ; 3 prre- 

 opercular spines. Dorsal XXXI 95. Anal III 70. Caudal rounded. 



