24 Harlow, Breeding Birds of Penna. and N. J. [j^_ 



regularly in Erie County. Data on twelve New Jersey nests give: average 

 set, 5 (4-7); average date, May 25 (May 14- July 9). 



34. Accipiter velox. Sharp-shinned Hawk. — Rapidly decreasing 

 in numbers and now one of the rarest breeding hawks in both states. A 

 set of eggs in my collection taken at Clementon, N. J., on June 1, 1915, 

 is my nearest record to Philadelphia as well as the most recent one for this 

 district. I have noticed this hawk as a rare summer resident in Berks, 

 Monroe, Pike, Wayne, Center, Huntington, Mifflin, Lycoming, and 

 Alleghany Counties. Data on nine nests give: average set, 5 (3-6); 

 average date, May 25 (May 14- June 29). 



35. Accipiter cooperi. Cooper's Hawk. — A breeding bird through- 

 out both states, becoming much rarer in the northern, mountainous parts 

 of Pennsylvania. Data on twenty-four nests give: average set, 5 (3-6); 

 average date, May 5 (April 23- June 10). 



36. Astur atricapillus atricapillus. Goshawk. — A very rare 

 breeder in the few heavily timbered, most boreal, mountain districts of 

 Pennsylvania. Apparently does not breed on the Pocono plateau. A 

 set of two eggs taken in Warren County, Pa., on April 3, 1910, in my col- 

 lection. 



37. Buteo borealis borealis. Red-tailed Hawk. — Breeds rarely 

 in southeastern Pennsylvania, more commonly in the southern tier of 

 counties to the westward and very commonly in the southwestern counties, 

 Greene and Washington, as well as in Warren and Indiana. I have been 

 unable to find it nesting in central or northeastern Pennsylvania or in 

 southern New Jersey. Stone, in his ' Birds of New Jersey ' gives it as a 

 common resident but if there is a definite record of its nesting in the south- 

 ern counties I have failed to find it. Data on nine nests give: average 

 set, 2 (3); average date April 6 (March 24-April 20). 



38. Buteo lineatus lineatus. Red-shouldered Hawk. — In New 

 Jersey it is a scarce but regular summer resident in the southern counties 

 becoming very common in the northern half of the state. In Pennsylvania 

 it is a rare breeder in the southeastern portion and in Greene County in 

 the southwest; more common from Alleghany county north and quite 

 common in the mountains from Warren to Monroe, avoiding the central 

 counties but becoming the common breeding hawk of the Pocono plateau. 

 Data on nineteen nests give : average set, 3 (2-4) ; average date, April 23 

 (April 15-May 25). 



39. Buteo platypterus. Broad-winged Hawk. — Scarce but regular 

 summer resident in southern New Jersey where I have found them under 

 circumstances that left no doubt but that they were breeding, in all the 

 southern counties. In Pennsylvania it is fairly well distributed in the 

 breeding season being most plentiful in Chester, Delaware and the central 

 counties, and least common in the most northern mountainous counties. 

 I have found its nests north to Pike County in the east and from Alleghany 

 to Warren in the west. Data on twelve nests give: average set, 2-3 (4); 

 average date, May 15 (May 7-June 13). 



