. Birds of the Colorado valley ... scientific and popular information concerning North American ornithology;. Birds. 450 CASE OF A HYBEID SWALLOW IL Hirundo norreori-lunifrons*—In the July number of the Bnlletin of the Nuttall Ornithological Club, received just too late to make use of in the proper connection, Mr. Spencer Trotter describes a remarkably interesting Swallow, determined to be a hybrid between Hirvndo liorreorum and Petro- chelidon lunifrons. The specimen, shot at Lin wood, Delaware County, Pa., May 2-2,1878, by Mr. C. , " has been examined by several competent ornithol
. Birds of the Colorado valley ... scientific and popular information concerning North American ornithology;. Birds. 450 CASE OF A HYBEID SWALLOW IL Hirundo norreori-lunifrons*—In the July number of the Bnlletin of the Nuttall Ornithological Club, received just too late to make use of in the proper connection, Mr. Spencer Trotter describes a remarkably interesting Swallow, determined to be a hybrid between Hirvndo liorreorum and Petro- chelidon lunifrons. The specimen, shot at Lin wood, Delaware County, Pa., May 2-2,1878, by Mr. C. , " has been examined by several competent ornithologists, who all pronounce its hybrid nature as unquestionable"; and the description given by Mr. Trotter would seem to warrant such con- clusion. Above, the bird is H. horreorum throughout, excepting the grayish- fulvous rump ; below, it has the' black throat-spot and general color of P. lunifrons. The bill is rather thicker, the feet are stronger, and the tarsi more feathered than in S. horreorum; the tail is shorter than in that species, less deeply forked, with less attenuated outer feathers, and with the white spots not so well marked.—Hybridity is very seldom observed among the Swallows, and this is the first recorded instance of its occur- rence in this country. It has, however, been noted in the case of the European Hirundo rustica X Chelidon urbica; see Gloger, Vogel Europas, i. 417 ; and Sundevall, Ofvers. Kongl. Forh. for ftr 1845, p. 128. III. A correction.—At pp. 394,395, I have quoted some remarks made by Dr. Brewer on the improvement in the architecture of the European House Mar- tin, Chelidon urbica. It appears from a note recently published by this writer t that no such improvement as was alleged has occurred, the nest that is now so well built being that of Hirundo rustica, while that of the Martin continues the same. * 1878. Trotter, S. Description of a Hybrid (Hirundo horreori-lunifrons) between two North American Swallows. <[ Bul
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