MASTACEMBELUS. 137 



28. MASTACEMBELUS STAPPERSII. 

 Bouleng. 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 2J to 2-f 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 eye; no praeorbital or 

 prseopercular spines. Dorsal XXX1I-XXXIII 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 



>^ 



2/astacembehts sta/ppersii. 

 Type. f. 



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 R., near Elisabethville. Dr. L. Stappers (('.). 



29. MASTACEMBELUS TRISPINOSUS. 

 Steind. Anz. Ak. Wien, 1911, p. 529, and Sitzb. Ak. Wien, cxx. 1. 1911, p. 1183 



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 prse- 

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



