44. Frogne subis, (Linn.)
Occurs during the migrations. I have seen them as early as Janu- ary 20.— (P. purpurea, Dresser, Ibis, 1865, 479.)
45. Fetrochelidon lunifrons, (Say.)
Very common from early in April until the latter part of August. It is one of the most abundant of the summer visitors, and is the only Swal- low that breeds here. I have not been able to detect P. swainsoni, Scl., of Mexico. — (Sennett, B. Rio Grande, 15. — Hirwndo Z., Dresser, Ibis, 1865, 479.)
46. Hinmdo erythrogaster var. horreorum, Barton.
The latest Swallow to arrive in the spring and the earliest to return in the autumn ; first seen about April 12, or earlier" and August 9. — (R. horreorum, Dresser, Ibis, 1865, 479. — Sennett, B. Rio Grande, 15.)
47. Tachycineta bicolor, (Vieill.)
Common during the migrations. Some of this species must pass the winter at no great distance from here, as I have frequently seen small flocks in November, December, and January, after a few warm days. — (Sennett, B. Rio Grande, 15.)
48. Cotyle riparia, (Linn.)
Not rare during the migrations. One of the latest Swallows to return in the autumn.— (Dresser, Ibis, 1865, 479.)
49. Vireosylvia olivacea, (Linn.)
May. — ( Vireo o.. Dresser, Ibie, 1865, 480.— Sennett, B. Rio Grande, 16.)
50. Vireosylvia flavoviridis, Cassin.
Vireosylvia flavoviridis, Cassin, Pr. Pbila. Acad. V, Feb. 1851, 152 j VI, pi. ii (Panama).— Scl., P. Z. S. 1856, 298 (Cordova); 1859, 375 (Oaxaca; April) ; Catal. 1862, 44, No. 264 (Guatemala).— Scl. &, Salv., Ibis, I, 1859, 12 (Guatemala) j Nom. Neotr. 1873, 11, No. 3 (Mexico to Panama).— Baird, Review, May, 1866, 336 (Monterey, Mazatlan, and Rosario, near Colima, Mexico ; San Jos6, Costa Rica ; Isth. Panama). — Sumichrastv Mem. Boston Soc. I, 1869, 547 (Orizaba ; Alpine Reg.).— Boucard, Cat. 1876, 215, No. 6665 (" N. America "). Vireo flavoviridis, Baird, B. N. Am. 1858, 332. Phyllomanes flavoviridis, Caban., Journ. 1861, 93 (Costa Rica). A single specimen, a male, taken within the fort, August 23, 1877.
51. Vireosylvia gilva, (Vieill.)
October 2, 1877.— ( Vireo gilvus, Dresser, Ibis, 1865, 480.)
52. Lanivireo solitarius, (Wils.) August 23, 1877.— ( Vireo $., Dresser, Ibis, 1865, 481.)
53. *Vireo noveboracensis, (Gmel.)
A common resident, breeding abundantly. — (Dresser, Ibis, 1865, 481.— Sennett, B. Eio Grande, 16.)
