DELAWARE VALLEY ORNITHOLOGICAL CLUB. 



3U 



3. Observers should take care to familiarize themselves with 

 the differences between closely related species which are often 

 confused, i. e., White-crowned and adult White-throated Spar- 

 rows (which have white crowns); Least and Acadian Fly- 

 catchers; the two Water-Thrushes; Olive-backed and Gray- 

 cheeked Thrushes which are equally abundant here; Rusty 

 Blackbirds and female Purple Grackles, etc. Specimens of all 

 these may be seen in Dr. Stone's room at the Academy. 



4. Please follow exactly the instructions on the schedule and 

 do not write in additional species between the lines, as this causes 

 great annoyance to the compiler and is likely to result in the 

 omission of such records altogether. 



5. Following are the average dates of first arrival and " bulk 

 arrival" for the species on the schedule, arranged in order of 

 *'bulk arrival." In all cases "bulk arrival" is intended to 

 denote the date upon which the species reached half of the 

 stations within the Philadelphia ten-mile radius, the last quarter 

 of the arrival records for each species being rejected in the com- 

 putation as being probably not the real dates of first arrival at 

 those localities. 





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Name. 





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Purple Grackle 



Feb. 



22 



Feb. 28 



Bluebird 











Feb. 



17 



Mar. 2 



Robin , 











Feb. 



14 



Mar. 2 



Fox Sparrow . 











Mar. 



1 



Mar. 7 



Meadowlark . 











Feb. 



6 



Mar. 8 



Red-winged Blackbird 











Mar. 



3 



Mar. 10 



Killdeer. 











Mar. 



2 



Mar. 11 



Flicker . 











Feb. 



17 



Mar. 15 



Rusty Blackbird 











Mar. 



15 



^iar. 20 



Phoebe . 











Mar. 



13 



Mar. 21 



Field Sparrow 











Mar. 



4 



Mar. 22 



Dove 











Mar. 



7 



Mar. 22 



Cowbird 











Mar. 



15 



Mar. 25 



