1874.] LARKS OF SOUTHERN AFRICA. 625 



from Sir Andrew ; but we have the type of bis A. codea, without 

 doubt the example described, but not the original of his figure, which, 

 it will be seen, does not tally with the description at all. Luckily 

 the very specimen figured is in the Museum, and I am enabled 

 therefore to state that it is an example of C. nivosa of Swainson 

 (C. albescens, Lafr.), which I consider to be nothing but the winter 

 plumage of A. lagepa. Although not possessing the actual type of 

 A. lagepa, we have specimens in the Museum which thoroughly agree 

 with Smith's description and figure ; and intermediate in plumage 

 between true A. lagepa and A. albescens is the typical specimen of 

 A. codea; while Mr. Layard's skins from the Berg River are also 

 changing, in my opinion, from summer to winter. There is a 

 gradual cinnamon tint pervading the whole grey upper plumage that 

 leaves little doubt as to its changing ultimately into the full- 

 plumaged A. lagepa. The ear-coverts are already light cinnamon. 

 The following are the measurements of the series examined : — 



Culm. wing. tail, tarsus, 

 in. in. in. in. 



a, ad. hiem., S. Africa (Smith) 0*7 335 2-5 1-0 



b, imm., S. Africa (Smith) 0*7 3*45 2*7 



c, ad hiem., Capetown (Butler) 0'65 325 2-6 0-95 



d, ad. hiem, Berg River (Layard) .... 0'7 3*35 2*5 0*95 



e, ad. hiem., Berg River (Layard) .... 0"75 36 2 - 75 1*0 

 /, ad. aestiv., S. Africa (Layard) 07 3*65* 2-8 1-05 



This species does not seem to vary in size so much as some of the 

 other South- African Larks. Specimens e and /have larger and ap- 

 preciably thicker bills and are probably males, though Smith says 

 that in the only male A. codea he obtained the bill was " considerably 

 shorter than in adult females, more conical, and the culmen towards 

 the point less curved." 



Hab. Western parts of the Cape colony, ranging from Cape- 

 town to Little Namaqua Land. 



Specimens examined. 



E mus. Brit. : — a, ad. vix sestiv. South Africa (Sir A. Smith, 

 type of A. codea). b, c, <3 $ sestiv. Grootberg, Little Namaqua 

 Land (C. J. Andersson). d, ad. hiem. Cape of Good Hope (/. 

 Gould), e, ad. hiem. S. Africa (Sir A. Smith, specimen figured 

 by him I. c). 



E mus. R. B. S. : — a, ad. aestiv. S. Africa (E. L. Layard). 

 b, c, 2 hiem. Berg River (E. L. Layard). d, ad. hiem. Cape- 

 town (W. Butler). 



E mus. B. B. Tristram : — a. South Africa (Layard). 



3. Heterocorys, gen. n. 



The type of this genus is a rare bird, the A. breviunguis of Sun- 

 devall, which has the appearance of an Alcemon, and a similar nostril, 

 this character separating it from Ammomunes, which it resembles in 

 its long tarsus and in the proportions of its bill. 



