North American fauna . County, on August 25, 1951 (I. R. Barnes). BLACKBURNIAN WARBLER Dendroica fusca (Muller) Status.—Breeding (see fig. 53) : Common in the AlleghenyMountain section; uncommon in the western part of the Ridge andValley section (Allegany County) ; rare and local in the easternpart of the Ridge and Valley section (occurring in FrederickCounty along Hunting Creek, at elevations above 1,280 feet).Transient: Fairly common in all sections except the Eastern Shoresection where it is rare. Habitat.—Breeding: Red spruce, hemlock, and white pinestands, and mixed mesophytic forests. Tr
North American fauna . County, on August 25, 1951 (I. R. Barnes). BLACKBURNIAN WARBLER Dendroica fusca (Muller) Status.—Breeding (see fig. 53) : Common in the AlleghenyMountain section; uncommon in the western part of the Ridge andValley section (Allegany County) ; rare and local in the easternpart of the Ridge and Valley section (occurring in FrederickCounty along Hunting Creek, at elevations above 1,280 feet).Transient: Fairly common in all sections except the Eastern Shoresection where it is rare. Habitat.—Breeding: Red spruce, hemlock, and white pinestands, and mixed mesophytic forests. Transient: Various typesof forest. Nesting season.—Probably late May to early July. Nest-building was recorded in Garrett County on May 31, 1951, and onJune 15, 1918 (Eifrig, 1920a). Adults were observed carryingfood in Garrett County on June 25, 1949. Spring migration.—Normal period: April 25-May 5 to May20-30; peak, May 5 to May 20. Extreme arrival date: April 23, BIRDS OF MARYLAND AND DISTRICT OF COLUMBIA 291. Figure 53.—Breeding ranges of Blackburnian Warbler and Yellow-throated Warbler. 1920, in Montgomery County (A. Wetmore). Extreme departuredates: June 4, 1945, in Prince Georges County; June 3, 1907, inthe District of Columbia (W. W. Cooke). Fall migration.—Normal period: August 20-25 to September25-October 5; peak, September 5 to September 25. Extremearrival dates: August 2, 1872, in the District of Columbia (USNM—E. Coues) ; August 14, 1886, in the District of Columbia (A. ) ; August 18, 1951, in Baltimore County (Mr. and D. Cole) ; August 19, 1942, and August 19, 1949, in PrinceGeorges County. Extreme departure dates: October 17, 1953, inMontgomery County (P. G. DuMont) ; October 17, 1954, in AnneArundel County (Mr. and Mrs. H. N. Page) ; October 16, 1954, inBaltimore County (S. W. Simon). Breeding population densities (territorial males per 100acres).— 110 (22 in 20 acres) in virgin hemlock forest in Garrett County in 1949 (Robbins, 1949
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1880, booksubjectzoology
