160 mr. g. a. boulexgek on [June 4, 



from the ventral, which is situated below the posterior half of the 

 dorsal. Caudal a little shorter than head, with deep crescentic 

 emargination. Caudal peduncle 1 1 as long as deep. Scales 38 ~ ; 

 4 series between lateral line and root of ventral. Upper parts and 

 fins blackish olive ; lips, gular and pectoral regions yellowish white, 

 bellv brown. 



Total length 110 millim. 



A single specimen. 



In its very minute barbels, this species is intermediate between 

 D. lamta and allies, in which they are well developed, and D. im- 

 herbis, in which they are altogether absent. A species from .Syria, 

 Transcaspia, the Tigris, and Persia, D. variabilis Heckel, to which 

 I refer specimens from Kushk and the Helmand 1 , agrees in the very 

 small size of the posterior barbels, but differs in the total absence 

 of the anterior and also in the more backward position of the 

 dorsal, which is equally distant from the occiput and the root 

 of the caudal, the position of the eyes, which are nearly perfectly 

 lateral and occupy the middle of the length of the head, and the 

 longer caudal fin. The scales number 33 to 37 in the lateral line, 

 4 or 5 between the latter and the ventral fin. 



In the Abyssinian and Erythrean specimens which have been 

 previously referred to I), lamta 2 , and for which I propose the 

 name D. blanfordi, the barbels are much longer, as in D. lamta, the, 

 eye is perfectly lateral and a little anterior to the middle of the 

 head, the interorbital width is more than half the length of the 

 head, the dorsal is equally distant from the eye and the root of 

 the caudal, or a little nearer the latter, which is longer than the 

 head, the scales number 33-35 g, 3 or 4 between the lateral line 

 and ventral fin. 



A third African species has been described by Vinciguerra 3 from 

 Shoan specimens, under the name of D. chiarinii. It has two pairs 

 of well-developed barbels, a larger eye (its diameter contained 

 only 3i- times in the length of the head), a little anterior to the 

 middle of the head, and smaller scales (L. lat. 42). 



I have recently received from Mr. Loat several small specimens, 

 measuring from 38 to 45 millim., obtained on the Nile in a pond 

 in the cataract country about 3 miles north of Kermeh, which 

 approach D. chiarinii in the size of the eye (34 diameters in length 

 of head), the length and number of the barbels, and the position 

 of the dorsal, but which may be distinguished from it by the 

 larger scales, numbering 37 or 38 in the lateral line and 3 between 

 the latter and the ventral. For this new species 1 propose the 

 name D. vinciguerra?. 



1 Kecorded by Giinther, Tr. Linn. Soc. (2) v. 1889, p. 107, under the name 

 of I), lamta. Recently described as I), romcv.s bv Kikolski, Ann. Mus. St. 

 Petersb. v. 1900, p. 239. 



2 Blanford, Zool. Abyss, p. 460 ; Vinciguerra, Ann. Mus. Genova, xriii. 1883, 

 p. 695, fig. 



3 L. c. p. 096, fig. 



