( *(i ) 



The jiveference ibr coast.-lines is not- even restricted to mijjrants, bnt also 

 sedentary species spread more along the coast-lines than over the inland regions. 



Tims we see Mediterranean forms extending along the coasts of Western 

 Enrope as far north as England : the White Owl, tiie Dartlbrd-Warbler, Chough 

 and Cirl-Bnnting, viA West France, more or less. 



Thns we (ind tropical hirds have extended their range to Africa Minor, 

 niuloubtedly by the coast-line and not through the great desert, for they are not 

 found at all in the Sahara, and mostly not even sonth of the Atlas, bnt only along 

 the north coast: Atsio capcmin in North Marocco and North Algeria, Telopkotms 

 seiieqallua and Pijcnonotus barhatus in North Marocco, North Algeria and North 

 Tunisia, all three very sliglitly altered by isolation, 'I'artuy (rectins Streiitopelia) 

 iciicqaleims in the uorthem oases. On the other hand, the Crested Larks, which 

 inhabit Senegambia and Northern Nigeria, have undoubtedly extended their range 

 from Africa Minor to the tropics by the coast-regions, because they do not occur 

 in the central Sahara, bnt are found at Rio de Oro, under the tropic of Cancer. 



I hope to be able to make more observations on these fascinating subjects 

 before long, and trust that a careful stijjy of the local forms of birds, in combination 

 with the valuable exi)eriments of bird-marking, will help us to bring forward 

 numerous proofs of my theories. It must, however, be remembered that birds 

 do not work like machinery and clock-work, and tliat, therefore, exceptions from 

 most rules will occasionally take j)lace. 



V. 



REPTILES AND BATRAGHIANS. 



By ERNST HARTERT. 



After leaving Ouargla, where Reptiles had been collected by Lataste, Kocnig, and 

 others, I began to pay attention to all Rei)tiles ; and especially at El-(iolea and 

 i'arther southwards, from where nothing was hitherto known, we tried to get as 

 many species and specimens as possible, though taking only a few of the largest 

 kind, and a limited number of the common species which were brought in by boys 

 in the oases. 



The whole collection was kindly named for me by Mr. Bonlenger, who also 

 supplied the description of the two new forms from the Tidikelt oases, and notes 

 on Stenodactylus petrii, Acanthodactijlus and Chalcides. My sincere thanks are 

 due to Mr. Boulenger, who thus enabled me to give a list of this collection. 



The specimens have been presented by Mr. Rothschild to the British Museum, 

 only some of the Uromastix and a few duplicates of lizards being kept in the Tring 

 Musenm. 



The following works dealing witli North-West African herpetology have been 

 consulted : 



(1) Boulenger: Catalogue of the Reptiles and I'atraohians of Barbary 

 (Marocco, Algeria, Tunisia), based chiefly upon the Notes and Collections made in 

 18S0— 1884 by M. Fernand Lataste (1891). Plates XIII.— XVIII. 



In Trans. Zool. Soc. London, xiii. 



