230 On a new Deserl-Larh. 



different from the narrowed foramina of the other species. 

 Canines less broad at their bases than in N. nasua. Molars 

 large^ m^ with a well-developed internal cusp. 



Dimensions of the type : — 



Hind foot (dry) 90 mm. 



Skull : greatest length 130 ; condylo-basal length 120 ; 

 zygomatic breadth G2 ; length of nasals in middle line 36 ; 

 interorbital breadth 27 ; breadth of brain-case 47 ; palatal 

 length 77 ; palatal foramina 5 ; front o£ canine to back of 

 m' 46; length of molar series 21-3; m^, length 7-7, 

 breadth 6-8. 



Hab. Balzar Mts.,N.W. of Guayaquil, Western Ecuador. 



Type. Subadult male. B.M. no. 80.5.6.78. Collected 

 by Mr. Illingworth. 



This is the representative of N. nasua in the coast country 

 to the west of the Andes. The little A^. olivacea is also 

 found in Ecuador, as is the intermediate sized iV. quichua, 

 Thos. 



XXVIII. — Description of a new Desert-Lark from the Central 

 Western Sahara. By Ernst Hartert. 



The mountains and stony desert-tracts of the northern 

 Sahara are inhabited by sand-coloured Desert-Larks which 

 are now generally looked upon as races of Ammomanes deserti. 

 Thus in the Algerian Sahara a reddish subspecies, Ammomanes 

 deserti algeriensis, is common in suitable places. On the 

 expedition to In Salah I found the latter as far south as about 

 30 kilometres north of El Golea, but after that it ceased 

 entirely, and did not occur again until we came to the banks 

 of the waterless Oued Saret, where it suddenly was in evidence 

 again, but in a conspicuously different form, which I propose 

 to name 



Ammomanes deserti mya, suljsp. n., 



after the Biver or Oued Mya, in the system of which we 

 only found this bird. 



This form does not much differ in colour from A. d. alye- 

 riensis, though it is generally less reddish, especially on the 

 rump, and the tail-feathers are more blackish on the inner 

 webs; but it ditlcrs considerably in size : wing of males 107- 

 111, of females 97-101 mm., i. e. about 6-7 mm. longer 

 than in A. d. algeriensis ; tail about 74-76"5 mm. The bill 



f 



