208 ANNALS OF SCOTTISH NATURAL HISTORY 



visited. The obvious cause of this is the extreme abundance 

 of hairy caterpillars, particularly those of some of the Bom- 

 bycidas, which in Tiree are scarce or absent, owing to want 

 of food-plants. I may add that I have noticed young 

 Cuckoos in Coll during the last week in August. 



There is apparently a regular passage across both islands 

 of the White Wagtail (Motacilla alba} both in spring and 

 autumn ; and I think further observation will prove the same, 

 but not in any numbers, with the Black-tailed Godwit 

 (Livwsa belgicd), as this bird passes by the east coast of 

 Ireland and Solway Firth in spring, probably en route to 

 Iceland. 



I. BIRDS BREEDING BOTH IN COLL AND TIREE. 



1. WHEATEAR, Saxicola cenanthe. 



2. STARLING, Sturmis vulgaris. 



3. RAVEN, Corvus corax. 



4. HOODED CROW, C. comix. 



5. TWITE, Linota flavirostris. 



6. TREE SPARROW, Passer montanus. 



7. HOUSE SPARROW, P. domesticus. 



8. CORN BUNTING, Emberiza niiliaria. 



9. MEADOW PIPIT, Anthus pratensis. 

 10. ROCK PIPIT, A. obscurus. 



n. SKYLARK, Alaitda arvensis. 



1 2. PEREGRINE FALCON, F. peregrinns. 



13. MERLIN, Falco cesalon. 



14. KESTREL, F. tinnunculus. 



15. SHELDRAKE, Tadorna cornuta. 



1 6. WILD DUCK, Anas boscas. 

 i 7. TEAL, Querquedula crecca. 



1 8. RED-BREASTED MERGANSER, Mergus serrator. 



19. ROCK DOVE, Columba livia. 



20. CORN CRAKE, Crex pratensis. 



21. WATER HEN, Gallimda chloropus. 



22. COOT, Fulica atra. 



23. RINGED PLOVER, ^gialitis hiatiada. 



24. PEEWIT, Vanellus vulgaris. 



25. OYSTER-CATCHER, H<zmatopus ostralegus. 



26. SNIPE, Gallinula ccelestis. 



27. DUNLIN, Tringa alpina. Hundreds in Tiree ; very few in Coll. 



28. COMMON SANDPIPER, Totanus hypolencus. More in Coll. 



29. ARCTIC TERN, Sterna macrura. 



30. COMMON TERN, S. fluviatilis. 



