422 llcv. H. B. Tristram un the 



Ammomanes pallida. It would be remarkable aud unusual were 

 the same species, which is migratory as far as the Arctic circle, 

 to be found resident on the arid plains of Arabia and Africa 

 under conditions so dissimilar from those of its northern habitats. 



73. Calandrella brachydactyla. (Short-toed Lark.) 

 Many flocks occur in winter in the neighbourhood of the 



oases and on the northern limits of the Sahara. It breeds abun- 

 dantly under the slopes of the Atlas, but not, so far as I am 

 aware, in the Desert. 



74. Calandrella reboudia, Loche, MSS.; Ibis, vol. i. p. 58. 

 (Reboud's Lark.) 



I have retained the name given tu this bird, in honour of 

 Dr. Reboud, a zealous Algerian naturalist, by Capt. Loche, 

 although he has not yet published a description of the species. 

 It differs from C. brachydactyla in having the outer portion of 

 the external rectrices of a pure white, and the beak much shorter 

 and stouter, besides the usual pale coloration so distinctive of 

 Desert birds. It is, unlike its congener, a permanent resident in 

 the Desert, and has a wide lateral range, as I have obtained it 

 in the western Sahara, and have received a female specimen, with 

 a nest of four eggs, taken a little to the south of El Djem, in the 

 Regency of Tunis. The eggs are like large varieties of C. brachy- 

 dactyla. I am not aware of the two species ever occurring in the 

 same localities. The present is most probably merely a Desert 

 form of its congener. 



75. Ammomanes isabellina (Temm.) ; Consp. Av. p. 244. 



(Desert-Lark.) 



Occurs first on leaving the Hants Plateaux in small numbers, 

 but is more plentiful further south, inhabiting the open plains, 

 where it is difficult to conceive how it finds subsistence. Its lateral 

 range is wide. 1 have obtained it from the frontiers of Morocco 

 to Arabia Petrsea. It is sedentary, and breeds both in the 

 Algerian Sahara and in the wilderness of Judsea, in both which 

 localities I have taken the nest, neatly formed of grass in a de- 

 pression under a tuft of weeds, and with four eggs, in size nearly 

 equal to those of Galerida cristata, but never so elongated, mea- 

 suring 11 lines by 8 lines, of a rich cream colour, blotched, 



