Measure- 

 ments. 



253 



Average size of 34 eggs from the British Isles measured by the 

 Avriter, and 66 from Germany by Dr. Rey, 15.45x12.09, Max. 17.7x12.6 

 and 17.1 X 13.7; Min. 13.3 X 10.8 mm. A double egg measures 

 19.2 X 13.6 mm. Average weight of 16 full eggs, 1.010 g. (N. H. Foster), 

 while Rey gives the average weight of blown eggs as 62 mg, and Bau 

 as 51 mg. 



b. Scandinavian Chifif Chaflf, P. collybita abietinus (Nilss.). 



Foreign Names: Finland: Tynnyrilintu. Hungary: Csil-csal 

 Fiizike. Norway: Oransanger. Russia: Tenkowka. Sweden: Oran- 

 sdngare. 

 P. collybita ahietina (Nilss.) Hartert, Vog. Pal. Fauna, p. 503. 



Breeding Range: Scandinavia, E. Germany, Austro - Hungary, 

 N. Balkan Peninsula, and Mid-Russia. 



In Scandinavia the Chifichaff haunts the subalpine zone, especially ^°"' 

 where deciduous trees prevail. It is found not uncommonly in Norway Europe. 

 up to lat. 65^10' and was recorded by Collett from lat. 67" in 1876, 

 It is however absent from S. Sweden and but rarely breeds in Denmark. 

 In Germany it is the representative form in E. and W. Prussia, Pomerania 

 and Silesia, and in Austro -Hungary occurs in the Danubian valley and 

 is common in Transsylvania. In the Balkan Peninsula it is common in 

 Montenegro, but is only met with in winter or on passage in Greece 

 and Macedonia. It appears to breed in N. and Mid Finland, but in N. 

 E. Russia is replaced by P. c. tridis, although not uncommon in the 

 Baltic Provinces and Poland. Eastward its range extends to the Perm 

 Government, and the valley of the middle Volga, but in the S. E. it 

 apparently occurs only on passage, and has not been proved to breed 

 in the Caucasus, though it often occurs there. 



The nesting habits do not differ from those of the W. race, and ^^^*- 



and 



the eggs are also similar. The clutch consists usually of 6 eggs, but in Ei^gs. 

 Norway 8 have been found (Collett). The average date for full clutches 

 is from mid May to early June. Average size of 27 eggs from Silesia, 

 15,1 X 12 (Kollibay): 16 eggs from Poland average 15.1 X 12.2 

 (Taczanowski). 



c. Siberian Chiff chaff, P. collybita tristis Blyth. 



Plate 22, fig. 10 (Altai, 21. V.). 



Eggs: Dresser, pi. — , fig. 13, 14. 



Phylloscopus tristis Blyth. Dresser, B. of Europe, II, p. 477 and 

 Man. Pal. Birds, p. 98. P. collybita tristis Blyth. Hartert, Vog. Pal. 

 Fauna, p. 503. 



Breeding Range: N. E. Russia [Also W. Siberia to Transbaikalia]. 



