103 L^^ol- x^iii- 



Hupeh Prov. : Wing, ^ , 69-73. 

 Mid. Yangtze : Tail, c? , 61-65. 



Six specimens. 



The measurements of twelve examples of Parus m. com- 

 mixtus Hartert in my collection are : 



Wing, <^ 66-5-69, ? 61'5-65-5. 

 Tail, c? 58-61, ? 50-54. 



But, besides this Parus m. commixtus Hartert, the Common 

 Tit of Fohkien, there are two other forms much less common 

 at Foochow than the green-backed bird, but still by no 

 means rare. In one of these, which I take to be the real 

 P. comviixtus of Swinhoe, the back is grey with just a little 

 green on the upper back. The proportions are those of the 

 green-backed bird. In the other form the back is entirely 

 of a rather pale blue-grey without a trace of green. Under- 

 parts whitish grey, a little darker on the flanks. Wing as 

 in green-backed bird. All these three forms are resident at 

 Foochow, where the nests of the green-backed and grey- 

 backed birds were taken by Rickett, both the green-backed 

 and the grey-backed birds breeding in the same locality. 



Thus there are at Foochow two distinct forms and an 

 intermediate bird, which may be the result of hybridization. 

 These forms have hitherto been mentioned by Swinhoe, 

 Sty an, Rickett, and myself as follows : — 



(a) Parus minor T. & S. 



Swinhoe, P. Z. S. 1863, p. 270, 187J, p. 361. 

 Styan, Ibis, 1887, p. 221. 

 La Touche, Ibis, 1892, p. 418, 1899, p. 401. 

 Pickett and La Touche, Ibis, 1905, p. 27. 



(6) Parus commixtus Swinhoe. 



Swinhoe, P. Z. S. 1871, p. 361 (also P. Z. S. 1863, p. 270, 

 but not named). 



Styan, Ibis, 1887, p. 221. 



(o) Parus cinereus Vieill. 

 Swinhoe, P. Z.S. 1863, p. 270. 

 Styan, Ibis, 1887, p. 221. 



