Dr. A. Gunther on new Fishes frovi Zanzibar. 457 



tions, diiFer in toto. How these differences have been brought 

 about is beyond our comprehension ; but when we do find 

 them, they ought assuredly to be made known. 



The three species of Eutoxeres above described are on a par 

 with Phaethornis Guyij P. Emilice^ and P. yaruqui^ which 

 every one now regards as distinct. Sufficient has been said 

 to point out the specific peculiarities of E. aquila^ E. Tieterura^ 

 and E. Salvini ; it is therefore unnecessary to give a descrip- 

 tion of the latter. 



The species of the genus Eutoxeres now known are : — 



Eutoxeres Gondamini. Habitat Archidona in Eastern 

 Ecuador. 



heterura. Hab. Central Ecuador. 



aquila. Hab. New Granada. 



Salvini. Hab. Veragua and Costa Rica. 



LIII. — Additions to the Ichthyological Fauna of Zanzibar. 

 By Dr. A. Gunthee, F.R.S. 

 De. Kiek has lately sent a collection of Fishes from Zanzibar 

 to the British Museum ; it contained the following new forms 

 (besides several others previously not known to exist on that 

 coast, viz. Dules Bennettiij Rhynchichthys pelamidis^ Brama 

 orcinij Eleotris madagascariensis^ El. fusca^ Chromis mossam- 

 bica^ Exocoetus nigri^innis) : — 



Tholichthys osseus. 

 I propose this name for a fish which, although young, is 



(Six times the natural size.) 

 evidently the type of a new genus, and appears to belong to 



Ann. & Mag. N. Hist. Ser. 4. Vol.i. 



32 



