206 CYPMNIDJL 



The occurrence of this fish in this brackish lake, so remote from the Nile system, is 

 very remarkable. 



Dr. Giinther (P. Z. S. 1896, p. 223) records B. bynni from the Shebeli River, but as 

 the large specimen to which he alludes has not been preserved in the British Museum, 

 1 am unable to verify his determination. The fish may be the one since described by 

 me as B. erlangeri. 



Avery closely allied species, B. ruspolii, Vincig., inhabits Lake Gandjule (Margherita), 

 but it may be distinguished in having only 1\ series of scales between the lateral line 

 and the ventral fin ; the spine of the dorsal fin is enormously developed. 



The following is a list of the specimens on which the above description is 

 based : — 



G Lower Nile.— Petherick, 1861. 



3 Freshwater trench near Damietta. — Loat, 2.6.99. 



1 Freshwater canal near San, L. Menzaleh. — Loat, 27.6.99. 

 23 Nile near Samannud. — Loat, 7.99. 



38 Damietta branch of Nile, upstream side of Barrage. — Loat, 4.8.99. 



2 Nile near Id. of Warrag, 2 miles N. of Cairo. — Loat, 15.3.99. 

 6 Nile near Cairo.— Loat, 11 & 28.3.99. 



44 Beni Souef —Loat, 8.99. 



1 Sanhur, near Beni Souef. — Loat, 5.9.99. 



2 Bahr Selah, Fayum.— Loat, 6.10.99. 



1 Lahun, Bahr-el-Yusuf, Fayum. — Loat, 5.10.99. 

 1 Nile between Abu-Tig and Assiut. — Loat, 1.12.99. 



4 At a regulator near Luxor. — Loat, 10-11.00. 



20 Nile between Luxor and Assuan. — Loat, 9-10.00. 



4 Nile at Assuan. — Loat, 8-9.00. 



1 El Maharakka.— Loat, 23.6.00. 



1 Korosko.— Loat, 26.1.00. 



1 Derr.— Loat, 3.2.00. 



m Wad j Haifa.— Loat, 23.2.00. 



2 Kosheh.— Loat, 8.3.00. 

 1 Korti.— Loat, 19.5.00. 



8 Khartum.— Petherick, 1862. 

 1 Rosaires, Blue Nile. — Capt. Flower, 6.05. 

 10 Lake Baringo. — Sir H. Johnston, 1901. 



It is very remarkable, considering tbe occurrence of this fish at Khartum and in 

 Lake Baringo, that not a single specimen should have been obtained in the White Nile 

 by Mr. Loat. This observer has noted its occurrence in Lake Menzaleh in fair 

 numbers in the Nile time ; it is found at Rosetta during the rise and fall, but at other 

 times only a few occur ; it is fairly common in the Bahr-el-Yusuf, and is also taken in 

 the inigation ponds and trenches, but is not numerous anywhere. 



