DELAWARE VALLEY ORNITHOLOGICAL CLUB. 59 



New arrivals, Wave VII 



April 30. Olive-backed Thrush, White-eyed Vireo, Prairie 

 Warbler. 



May I. Canada, Blackburnian, Chestnut-sided, Magnolia 

 and Parula Warblers, Yellow-throated Vireo, 

 Indigobird, Least Flycatcher, Bobolink, Balti- 

 more and Orchard Orioles. 



May 2. Yellow- billed Cuckoo, Wood Pewee, Great-crested 

 Flycatcher, Kingbird, Scarlet Tanager. 



From April 29th to May 1st the Ovenbird arrived at 12 sta- 

 tions, Catbird 13, Wood Thrush 13, but scarcely any of the new 

 arrivals were generally reported, being represented only by scat- 

 tered individuals. 



May exhibited far more phenomenal temperature conditions 

 than April. The mean was 58°, five degrees below the mean of 

 thirty-seven years, and only once equaled during this period 

 —i. e. 57° in 1882. 



The highest temperature of the month was on May 10th when 

 77° was reached; IMay 14th and 15th with 84°, and May 19th 

 when 81° was registered; on only four other days did the maxi- 

 mum temperature exceed 70'. 



The only marked increases in temperature were May 12th- 

 14th, when the mean raised twenty-two degrees ; May 17th-19th 

 thirteen degrees, and May 21st to 23d eleven degrees. 



Between May 10th-12th there was a fall of eighteen degrees, 

 with frost on the last day, and a fall of twenty degrees between 

 May 19th-21st. 



The precipitation was 5.62, 2.41 above the average of thirty- 

 six years, and only equaled in 1873 (5.83). 



The real advent of summer weather was on .June 15th, when 

 conditions changed suddenly, and the cold was at an end. 



Waves VIII and IX 



Low temperature and rain from May 2d to 9th checked 

 migration at a most vital time, so that arrivals were scattered 

 over these days without much concentration. 



A sudden raise on May 10th brought an enormous flight on 

 May llth-12th, notwithstanding that the temperature dropped 



