1910. J PLUMAGE OF TllK RED GUOl.SE. 1033 



Pl. LXXXIV. Male jyrouse, chansiiip: from winter- to autiiiiiii-i)luinaj^c ; red tyjie, 



underside. No. 915. Forfarshire, 4.vi.07. 

 „ LXXXV. Female grouse, in autumn-plumage, black t\pe ; underside. No. 418. 



Caithness, 31. xii.06. 21iozs. 

 „ LXXXVI. Female grouse, in full breeding-plumage, Scottish buff-barred type; 



upperside. No. 226. Roxburghshire, 22.V.0G. 20^ o/.s. 

 „ LXXXV 1 1. Female grouse, changing from winter- to .summer-plumage, red 



type ; underside. No. 22G. Roxburghshire, 22.V.06. 

 „ LXXXVI II. Female grouse in full summer-plumage, underside. No. 217. 



Lanarkshii'e, 12.V.06. 



„ LXXXIX. Femalegrouse showing the bare broody patch of skin on the abdomen, 

 and the beginning of a, new growth of buff, broiul-harred feathers in n 

 double line down the abdomen; underside. No. 1)96. Argyllshire, 

 14.vii.07. 16 ozs. 

 „ XC. Female grouse, red type, feathers from flanks. Natural size. 



Figs, a&c (from No. 1864)', ff & It (from No. 226), & k (from No, 632), are 



varieties of the spring flank-feathers. 

 Fig. b (from No. 575) is a flank -feather from a very black hen. 

 Fig. d (from No. 1864) is an example of what is termed fine-barred, dark-red 

 winter-plunnige, with narrow blkck bars or lines on rather dark rufous 

 chestnut, the latter being slightly bleached towards the tip. 

 Figs, e &f (from No. 1864) ami / & m (from No. 661)' illustrate intermediate 

 stages of coloration, the feathers ])rol)ably having broken through the 

 skin when winter-conditions prevailed, and having completed their 

 growth under summer-conditions. 

 Figs, t & M (from No. 664) illustrate the reasoning upon which is based 

 the view just mentioned ; of these two feathers there is no doubt that 

 n was being grown much later than i, and therefore more in summer- 

 conditions, producing summer breeding-plumage. 

 „ XCI. Female grouse, red type, upper tail-coverts showing effect of wear ; the 

 breakage has occuiTed in each case at the parts which are unpigmented or 

 show the smallest amount of dark pigment. About H times natural size. 

 „ XCII. Grouse, red type, feet showing winter-plumage. 



Fig. 1. Right foot showing new winter-feathers and new nails (No. 1177)^ 

 „ 2. Left foot showing full-feathered winter-plumage. 

 „ XCIIL Feet of grouse, showing replacement of nails. 



Fig. 1. Right foot (No. 1148) with old nails ready to be shed. 

 „ 2. „ „ in- median vertical section. 



„ 3. Left „ (No. 1167). 3 «, old nails ; 3 i, new nails ; 3 c, shed nails. 

 „ 4. Right ,, (No. 1185) with new feathers and new nails. 

 „ XCIV. Heads of Grouse. 



Fig. 1. Female. No. 61, 22.i.06. Showing the black markings on the throat. . 

 ,, 2. Male. No. 545, 17.i.06. Showing the unifonii chestnut throat. 

 „ XCV^. Supraorbital comb in Grouse and Ptamiigan. 

 Fig. 1. Female Grouse (No. 1269, 8.ii.08.). 

 „ 2. Male „ (No. 1268, 8.ii.08.). 



„ 3. Male Ptarmigan. 

 „ XCVI. Supraorbital comb in Black-cock. 



„ XCVII. Scottish male grouse, showing abnormal erythrism; underside. Loch 



S ween, Argyllshire. No. 19. 19.viii.92. Hritish Museum (Nat. Hist.). 



„ XCVIII. Female gi'ouse of the Irish buff-barred type ; underside. Donegal, 



Ireland. No. 1217. 17.X.07. 22 ozs. 

 „ XCIX. Female grouse, abnormal vellow variety ; underside. Stornoway, Lewis, 



Hebrides, 30.X.1900; British Museum (Nat. Hist.). 

 „ C. Female grouse, grey variety : underside. Perthshire, 6.x. 89. British 



Museum (Nat. Hist.). 

 „ CI. Female grouse, grey variety ; underside. Type of L. persiciis G. R, Gray,- 

 but probably from Perthshire. British Museum (Nat. Hist.), 



