1918.] Letters, Extracts, and Notes. 185 



stage. — British Birds, vii. p. 249, wrongly described as a 

 clutch of 3 ; Bull. B. O. C. xxiii. p. 24.. 



Grey-headed Wagtail [Motacillaflava thunbergi). A clutch 

 of 6 from the Continent, showing true erythrism. 



Rock-Pipit (Anthus petrosus). Two clutches of 5 from 

 Kincardine, both of which are exceptionally fine examples 

 of true erythrism. — Ibis, 1916, p. 187. 



Wliitethroat (Sylvia communis). A clutch of 6 excep- 

 tionally handsome eggs from Northants ; also a clutch of 5 

 from Surrey, and two clutches from the Continent. — British 

 Birds, vii. p. 252, wrongly described as alt Continental. 



Lesser Whitethroat (Sylvia curruca) . A clutch of 4 from 

 Banham, Suffolk, taken June 25, 1909, by L. W. Leader, 

 who flushed the bird from the nest. This is believed to be 

 the first authenticated record of erythrism occurring in the 

 eggs of tliis species ; the eggs resemble in some respects 

 the erythristic e^^ of the Common Whitethroat, but they 

 ])ossess characteristics of the Lesser Whitethroat ; they also 

 agree in size. Weight : average 4 eggs, 0'095 m.g. ; average 

 weight of 4 erythristic eggs of Common Whitethroat, 

 01 13 m.g.— Bull. B. O. C. xxxvii. p. 22. 



Blackcap (Sylvia atricapilla). A particularly beautiful 

 and well represented series, to show that an erythristic 

 form shows as much variation as the type. — Bull. B. O. C. 

 xxvii. p. 49. 



British Song-Thrush (Tardus musicus clarkei). Clutches 

 of 5 and 4 from Surrey; also a clutch of 4 from Sussex, all 

 with pure white ground. The two Surrey clutches are only 

 faintly marked with pale red ; the Sussex clutch has rich 

 reddish-brown spots. One from the first clutch is figured 

 in Dresser's ' Eggs of the Birds of Europe.' An exactly 

 similar egg is figured in the Cat. Birds Eggs B. M. iv. pi. viii. 

 fig. 12.— Bull. B. O. C. XXV. p. 14 ; xxvii. p. 17 ; xxix. p. 87; 

 British Birds, vii. p. 254. 



Common Nightingale {Luscinia megarhijncha). A clutch 

 of 3 from Northants, with a rose-pink ground, heavily 

 marked at large ends with black-brown. — British Birds, vii. 

 p. 254. 



SER. X. VOL. VI. O 



