119 "^ '^' [Vol. xlii. 



His measurements (in millimetres) are: — 



South African males, 118-121; females, 124-125. 

 Senegal „ 108-115; „ 110-117. 



I have made some measurements of the examples in the 

 British Museum, and find the following results : — 



Sudan 8 males, 108-115, aver. 111. 5 females, 112-118, 



Shoa 5 males, 115-119, „ 116. [aver. 115. 



Uganda 4 males, 109-112, „ 110. 



South Africa . . 9 males, 107-118, „ 114. [aver. 111. 



Gold Coast 4 males, 111-117, „ 114. 10 not sexed, 102-118, 



Our series from western Africa are not very good or 

 well sexed, but I think it may be easily concluded from 

 the measurements given that Dr. Hartert had hardly 

 sufficient grounds on which to separate two forms of the 

 Didric. Anyhow, the Shoa bird should certainly be 

 included with the South African race on the measurements 

 given. 



Dr. C. B. TiCEHURST exhibited chicks in down and young 

 in various stages of growth of the Spotted Sand-Grouse 

 {Pterocles senegallus) , and made the following remarks : — 



At a previous meeting I showed similar chicks of Pterocles 

 senegalensis = exustus, and precisely the same moults take 

 place in P. senegallus. 



Young in down or Protojytgle pZrwna^^. General colour 

 above very pale sandy-yellow, paler, less golden-yellow 

 than in P. alcliata, but with the same black tips to the down, 

 which on the head is least marked, except above the eyes ; 

 area round the eyes pale ginger-brown. Underparts very 

 pale isabelline. Note that above, the down-pattern is simpler 

 (less variegated with gold, brown, white, and black) than in 

 P. alchata. This is especially so on the head and face. 



First feather or Mesoptile plumage. The down ^ is pushed 

 out by a semi-down feather. 



Both sexes alike (?). Very pale yellowish-isabelline with 

 fine blackish bars above ; whitish-isabelline below with fine 



