HAPLOCHILTJS. 419 



The specimens described by Dr. Steindachner were collected by the late Dr. Marno 

 in the Bahr-el-Seraf and in the Bahr-el-Gebel. A specimen had previously been 

 obtained near Khartum by Consul Petherick, and had been confounded with the 

 West-African H. fasciolatus by Dr. Giinther. Mr. Loat obtained one specimen at 

 Lake No (February 1901), and the British Museum has received from Dr. F. Werner 

 a further specimen obtained by him at Mongalla, near Gondokoro, in 1 905. 



II. marni resembles very closely, in form and markings, H. senegalensis, Stdr., from 

 the Senegal, and may have to be united with it. I have, however, not been able to 

 compare specimens from the Senegal, and can only judge from Steindachner's 

 description and figure. The name senegalensis would have priority over marni. 



4. HAPLOCHILUS B1FASC1ATUS. 



(Plate LXXIX. fig. 9.) 



Steindachner, Sitzb. Ak. Wien, lxxxiii. i. 1881, p. 199. 



Depth of body four and a half to five and three-fifths times in the total length, 

 length of head three and one-fourth to three and a half times. Head flat above ; 

 snout rounded, with the mouth directed upwards, the lower jaw scarcely projecting; 

 teeth small, forming a narrow band ; eye better visible from below than from above, 

 as long as the snout and three to four times the length of the head ; interorbital 

 width half the length of the head. Dorsal fin with 6 or 7 rays, originating above 

 posterior third of anal, twice as far from the head as from the root of the caudal fin ; 

 longest ray nearly two-thirds the length of the head. Anal fin with 15 rays, about 

 twice as long as the dorsal. Pectoral fin nearly two-thirds the length of the head, 



Measurements (in millimetres). 



Total length * 39 



„ „ (without caudal) 28 



Depth of body . 5 



Length o£ head 8 



Width of head . . . . 4 



Length o£ snout . 2-J- 



Diameter of eye 2 J 



Interorbital width 4 



Longest ray of dorsal fin ._..». 5 



„ „ anal fin 5 



Length of pectoral fin 5 



„ ventral fin ....... 4 



3n2 



