522 cichlid^:. 



"crimson, running in longitudinal series, may be present on the body, becoming fainter 

 behind. Some specimens are of a dark blackish green, with black bands, and a patch 

 of dark red below the pectoral fin. Some young may be very pale silvery green, almost 

 white, sometimes without any traces of transverse bands. 



This species attains a length of 290 millimetres. 



First discovered in the Algerian Sahara, where it occurs in briny wells, T. zillii has 

 successively been found in the Lake of Galilee (Chromis andrece, Gthr.), in the Lybian 

 Desert*, in Lake Menzaleh (Chromis menzalensis, Mitchell), and in Lake Rudolf. 

 M. Letourneux, Mr. Loat, and Mr. Schoeller found it in Lake Mareotis ; Mr. Loat in 

 Lake Borollos, in the Lower Nile, in the White Nile, and in the Bahr-el-Gebel, 

 Mr. Budgett in the Victoria Nile, and Baron M. de Rothschild in Lake Gancljule 

 (Margherita). It occurs also in the Niger and in Lake Chad. 



List of specimens examined : — 



2 Tuggurt, Algerian Sahara.— Canon Tristram, 1859. (Types of C. tristrami.) 



2 Tuggurt.— Dr. Werner, 1894. 



2 Wed Rir, Algerian Sahara. — Jus, 1884. 

 15 Lake Mareotis.— Loat, 12.11.99. 



4 Near Alexandria. — Schoeller, 6.04. 



3 Lake Borollos.— Loat, 6-7.11.99. 



6 Lake Menzaleh.— Br. J. C. Mitchell, 1895. (Types o£ C. menzalensis.) 



62 Lake Menzaleh.— Loat, 22.4-8.6.99. 



26 Grhet-el-Nassara, near L. Menzaleh.— Loat, 29.4-11.6.99. 



1 Bahr-el-Tawilah, near L. Menzaleh.— Loat, 29.6.99. 



85 Nile near Samannud. — Loat, 12.6-22.7.99. 



1 Nile at Cairo.— Loat, 17.6.00. 



19 In canal by side of road leading to Pyramids o£ Giza. — Loat, 6.4-7.3.99. 



1 Zoological Gardens, Giza.— Loat, 21.3.99. 



13 Lake No, White Nile.— Loat, 22.2-4.3.01. 



5 Gondokoro.— Loat, 20.1-16.2.02. 



1 Fajao, Victoria Nile.— Budgett, 25.8.02. 



1 Lake Rudolf.— Dr. Donaldson Smith, 1895. 



1 Jebba, Upper Niger. — Capt. G. F. Abadie, 1899. 



2 Mureji, Upper Niger. — Budgett, 1903. 



3 Lake of Galilee.— Canon Tristram, 1864. (Types of Chromis andfece.) 



The West-African T. melanopleura, A. Dnm. (lata, Gthr.), is just distinguishable 

 from T. zillii, to which it is very closely related. But it has a smaller mouth, a larger 

 eye, a usually longer pectoral fin, and the caudal fin is either squarely truncate or more 

 or less distinctly emarginate. 



* According to Panceri (Eend. Ace. Sc., Soc. E. Nap. xii. 1873, p. 113) it has been found in the artesian 

 wells of the oases of the Libyan Desert by Figari Bey (Stud. sc. stuT Egitto» 1864, i. p. 287). 



