The upper parts are olive green, under parts pale yellow. There is a faint yellowish stripe along the crown of the head and a very conspicuous yellow stripe, which passes over the eye, from the base of the bill to the nape. There are two bands of lemon yellow across the coverts, and the _inner_ web of the outer tail feathers is margined with white. Length 3·8 in.; wing 2·15 in. PALLAS’ WILLOW WARBLER Phylloscopus proregulus (Pallas) A single example of this Asiatic species has been obtained in Great Britain, its true home being across Eastern Siberia, where it nests from Lake Baikal to the Himalayas and Northern China. It closely resembles the Yellow-browed Warbler, but its colours are brighter. The crown stripe is well marked. The inner web of the outer tail feathers is _not_ margined with white, but its most distinctive feature is the bright lemon yellow rump. Length 3·7 in.; wing 2 in. THE GREENISH WILLOW WARBLER Phylloscopus viridanus, Blyth In summer this species inhabits Western Siberia from the Urals to the Himalayas and has only occurred once in England. It is very similar to our Willow Warbler, but the tips of the greater wing coverts are whitish and form a distinct bar. Length 4·25 in.; wing 2·25 in. THE CHIFFCHAFF Phylloscopus collybita, Vieillot It has yearly been our delight to listen for the cheery “chiff chaff” which announces the first arrival of this bird. Winter is hardly over, the March winds still blow and the trees are bare, but still he comes to brave our inclement weather and retain his position as the first harbinger of spring. A small green Warbler of skulking habits, we will have to watch carefully if we wish to see him, for as we approach he will leave his post high up on some tree and hide in the undergrowth. For some weeks he wanders about the country, here to-day and gone to-morrow—apparently at the dictates of his own will, but in reality ever creeping up steadily northwards in the trail of departing winter. At the end of April or beginning of May, having chosen his mate, the duties of nest-building begin. The nest is loosely placed in some bramble thicket or undergrowth in a wood, and often appears as though it had been carelessly thrown there. It is dome or oval shaped, loosely built of bents, moss, and leaves, and warmly lined with feathers. The six eggs are white, dotted and spotted with dark reddish brown.