The Birds of Pembrokeshire, XXXVil. 
on the Tuskar Rock on March tst in 1883, and others were seen 
passing at intervals until May 26th. At the same station Swallows, all 
making towards the north-west, continued to be seen from April 2gth 
until June 21st inthat same year. Their return south in the autumn 
is extended over an equally long period ; on Caldy they were noted 
to be flying south from August 31st until November rrth. Swallows 
make their journeys by daylight, being always observed to pass during 
the forenoon. The southward migration of the Goldcrest was noted 
on the Tuskar Rock to begin as early as July 27th in 1883. 
We learn much from these interesting reports concerning the 
dates on which some of our winter visitors leave our coasts for 
their northern breeding stations ; they remain with us much later in 
the spring than they are commonly supposed to do. ‘ Hundreds 
of Skua Gulls” were seen passing the Tuskar Rock so late as May 
28th in 1883; others again on May 31st; others on June 7th or 
June 8th, and even as late as June 22nd. Some of these Skuas 
were observed to be heading south, We believe that, very often, 
the direction of the flight of birds as they are passing any particular 
station may furnish no correct guide as to the goal they are aiming 
at. The wind prevailing at the time may lead them to be flying 
quite contrary to their course until they meet with one suitable to 
their journey, and they may then have to retrace hundreds of miles 
that they have been driven from their desired flight-line. The Great 
Northern Diver leaves St. George’s Channel about May rst for the 
north, and returns again in October. At intervals during the winter, 
as has been observed at Lundy, flocks of Guillemots and Razorbills 
re-visit the islands that form their summer nesting stations, stay for 
the night, and disappear again in the morning. Such unlikely birds 
as Water Rails and Moor-hens are included among the birds noticed 
at night in the autumn at the South Bishop’s and Smalls. The 
small soft-billed birds that arrive in the spring do not find their 
return journey to the woods and copses, in which they nest, any 
more exempt from peril than their departure in the stormy autumn. 
Thirty-five Whitethroats were killed against the Tuskar Light during 
the misty night of May rath, 1884; while ‘‘ scores” of Chiffchaffs 
perished on the night of April 22nd that same year. We learn 
that Cuckoos arrive in small flocks; eleven were seen passing 
