8 The Birds of Pembrokeshire. 
CHIFFCHAFF, Phylloscopus rufus.—This tiny bird is by far the 
most numerous of our summer visitors, and is greatly in excess 
of the Willow Warbler. In the shrubberies at Stone Hall, in 
the spring of 1885, we noticed eleven nests of the Chiffchaff, 
and only one of the Willow Warbler, and this, we think, is 
an approximation to the relative numbers in which these birds 
occur. From our experience in various parts of England, we 
have come to regard the Chiffchaff as more a bird of the hills, 
and the Willow Warbler as belonging to the plains. In North 
Devon, where we once resided, it was moderately hilly, and 
there the two birds were met with in about equal numbers. 
Where we are living now, on the Radstock coal measures some 
500 feet above the sea-level, the Chiffchaff is very numerous, 
and the Willow Warbler is seldom seen, just as is the case 
in North Pembrokeshire. In his north-eastern corner of the 
county, when he was at the other side of the Precelly Mountains 
which greatly influence the distribution of the Warblers with us, 
cutting many species entirely off from our northern and central 
districts, Mr. Dix had failed to notice this preponderance of the 
Chiffchaff we have pointed out. He observes of the Willow 
Warbler: “ Much less numerous than in the east of England ;” and 
of the Chiffchaff, “‘ This is about equal in number to the Willow 
Warbler,” and he considered that the Chiffchaff was more 
numerous in his neighbourhood in the autumn than it was in the 
spring. A few Chiffchaffs remain with us for the winter; we 
have seen one at Stone Hall in the beginning of January. 
WILLOW WARBLER, P2yWoscopus trochilus.s— A not very 
numerous summer visitor. A nest found at Stone Hall, near a 
pond much frequented by Herons, was entirely lined with the 
small grey feathers of those birds. 
WOOD WARBLER, PiyWoscopus sibilatrix.—A scarce and very 
local summer visitor. We greatly doubt if it occurs to the west 
of the Precelly Mountains. We could never meet with itin the 
woods at Stone Hall, or in the large covers of Trecwn, which we 
