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182 MousLEY, Birds of Hatley, Quebec. [j^n 



106. Wilsonia pusilla pusilla (Wilson). Wilson's Warbler. — 

 Rare transient; May 21. I have only seen one example of this little black- 

 cap flycatching warbler in five years. This was a male in 1911, which was 

 flitting about in some low bushes near a little stream on the outskirts of a 

 small swampy wood, and not being at all shy I had a very good opportunity 

 of watching it for some time and making sure of its identity. 



107. Wilsonia canadensis (LinuEeus). Canada Warbler. — Fairly 

 common summer visitant; May 16 to Aug. 26. Average date of arrival 

 (for two years) May 20; of departure (for two years) Aug. 19. Eggs: 

 June 9 to 12. The finding of this elegant little warbler's nest is by no means 

 an easy raatter, and I consider myself lucky in having located two so far, 

 the first of which was neatly hidden away under the fallen branch of a tree 

 amongst a tangle of rich vegetation on the outskirts of a cool damp wood. 

 The second was in similar surroundings, but at the foot of an alder sapling, 

 and both contained a beautiful full set of five eggs. They were composed 

 of dry leaves, strips of bark, moss and coarse grasses, lined inside with finer 

 grasses and long horse hairs, the average dimensions being: outside 

 diameter 4|, inside If inches; outside depth 3|, inside 1^ inches. Last 

 year I only saw three examples of this warbler, but during the present (1915) 

 spring migration I counted ten examples at various times during May, 

 besides locating three breeding pairs in June. 



108. Setophaga ruticilla (Linnaeus). American Redstart. — Com- 

 mon summer visitant; May 14 to Sept. 9. Average date of arrival (for 

 four years) May 15; of departure (for two years) Sept. 5. Eggs: June 3 

 to 13. This gay and charming little warbler is to be found in most of the 

 woods especially those of a damp nature. Here I have generally found its 

 nest in the crotch of a willow or alder sapling from 7 to 15 feet above the 

 ground. It is a very compact affair composed of grasses, strips of bark, 

 plant fibres and spiders webs woven together into a cup shape, and lined 

 inside with fine grasses, rootlets and long horse hairs, and in two cases a 

 few feathers were added. The average dimensions of five nests are: out- 

 side diameter 2f, inside 1^ inches; outside depth 3, inside I5 inches. Eggs 

 vary considerably in size, one very beautiful set I have, besides being very 

 small is heavily wreathed right round the centre of each egg. 



109. Dumetella carolinensis (Linnaeus). Catbird. — Fairly com- 

 mon summer visitant; May 23 to Sept. 18. Average date of arrival (for 

 four years) May 26; of departure (for two years) Sept. 13. Eggs: June 

 21 to July 17. The Catbird is not very plentiful either during the summer 

 or at migration times, and during the present season, 1915, 1 have not found 

 a single nest and have seen very few bu'ds. 



110. Nannus hiemalis hiemalis (Vieillot). Winter Wren. — 

 Fairly common summer visitant; April 20 to Oct. 21. Eggs: June 9. 

 This little wren is generally more plentiful at migration times, but as a 

 breeding species is decidedly restricted, one nest only having been located 

 so far. This was found by flushing the bird from a small decayed stump 

 (in the damp low lying part of a hilly wood) in a cavity of which the nest 



