DISCOGNATHUS. 187 



the root of the caudal ; first branched ray longest, a little shorter than the head. Anal 

 fin with II 5 rays, first branched ray longest, two-thirds to three-fourths the length of the 

 head. Pectoral fin as long as or a little shorter than the head, widely separated from 

 the ventral, which is situated below the posterior half of the dorsal. Caudal fin 

 deeply emarginate. Caudal peduncle about once and a half as long as deep. Scales 

 37-42 ^||, 3 or 4 between the lateral line and the root of the ventral, 16 or 18 round 

 the caudal peduncle. 



Brown or olive, somewhat lighter below, the lower surface of the head yellowish; 

 usually a small black spot behind the gill-opening ; a more or less distinct dark spot or 

 blotch on the caudal peduncle, separated from the caudal fin by a yellowish bar ; fins 

 dusky, the dorsal lighter at the base, which usually bears two to four black spots. 



Total length 118 millimetres. 



The numerous specimens brought home by Mr. Degen from Lake Tsana were 

 obtained in May and June, probably outside the breeding-season, since not one of 

 them shows the conical horny warts which were found on the snout of the male 

 specimen on which Ruppell founded his Gobio kirticeps. According to this author, 

 the fish is found in great numbers in all running streams of Abyssinia; but it is 

 not improbable that he has confounded with it the form for which I have proposed the 

 name of I), blaiifordii, from which KiippelPs species has already been separated by 

 Dr. Vinci guerra, who described as D. chiarinii small specimens from Lake Arsade, in 

 the Adda-Galla country south of Shoa. This little circular lake, situated at an altitude 

 of about 7000 feet, as well as others close by, of which the largest is L. Cialaka, is very 

 deep and almost completely deprived of mollusks, but two small fish were found in it, 

 viz. this Discognatlms and the Cyprinodont Haplochilus antinorii *. The species has 

 also been found in other localities near Addis Abeba f , in Lake Zwai, in Lake Abaia, 

 and in the Bisan-Gurracia, a tributary of the Sagau, south of Lake Abaia. 



The specimens examined by me are as follows : — 



9 Zegi, Lake Tsana. — Degen, 13.5.02. 

 30 Bahardar, Lake Tsana.— Degen, 4.6.02. 



3 Lake Arsade, Adda Gallaland. — Marquis O. Antinori, 1881. (Types of Discognatlms chiarimi, 



Vinciguerra.) 

 43 Lake Zwai, Arushi Gallaland.— Zaphiro, 5.12.04-15.1.05. 

 2 Akaki River, affluent o£ the Hawash.— Zaphiro, 30.1.05. 

 10 Suksuk River, affluent of the Hawash.— Neumann & Erlanger, 12.00. 



4 Gadschimboda River, affluent of the Hawash.— Neumann & Erlanger, 12.6.00. 

 1 Lake Abaia. — Baron Maurice de Rothschild, 1905. 



* Of. Antinori, Boll. Soc. Geogr. Ital. xviii. 1881, p. 595. 

 t Cf. Pellegrin, Bull. Mus. Paris, 1905, p. 291. 



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