GEOTHLYPIS. 155 
Ridgw. Am. Journ. Sc. 1872, p. 459°; Baird, Brew. & Ridgw. N. Am. B.i. p. 301°; Coues, 
B. Col. Vall. i. p. 318"; Merrill, Pr. U. S. Nat. Mus. i. p. 124"; Scl. & Salv. P. Z. 8. 1879, 
p. 494°, 
Supra olivacea, alis et cauda concoloribus ; capite undique cum gutture cinereis, loris paulo nigricantibus; gule 
plumis intus nigris ; pectore plaga nigra ornato; abdomine toto flavo ; rostri maxilla cornea, mandibula 
flavicante; pedibus pallide corylinis. Long. tota 5:0, ale 2°55, caudex 2:1, rostri a rictu 0-6, tarsi 0°84. 
(Descr. maris ex Angostura, Costa Rica. Mus. nostr.) 
? mari similis, sed coloribus valde dilutioribus, gutture vix cinerco tincto. 
Hab. Nortu America, Eastern Provinces, British Provinces, and occasionally Greenland ®”, 
Texas *™1.—Costa Rica, San José (v. Frantzius 5), Angostura and Dota Mountains 
(Carmiol?); Panama, Chiriqui (Arcé), line of railway (M*Leannan?).—Co.omBIA, 
Magdalena? and Cauca valleys 12. 
Though Mexico has been included in the range of this bird, a further examination of 
the specimens upon which the statement was founded has shown that they really belong 
to G. macgillivrayi, the western representative of this species’. In Texas, however, 
both Mr, Dresser4 and Dr. Merrill}! reeord its occurrence, the former stating that it 
was common on passage early in May 1864. 
In Costa Rica, the adjoining State of Panama, and throughout the northern portion 
of Colombia, G. philadelphia is a common bird in the winter season ; but as it does not 
touch on any of the West-Indian Islands, either during its flight southwards in autumn, 
or during its return journey in the spring, the line of its migration doubtless lies 
sufficiently to the eastward of the northern portions of the mainland to cause it to 
avoid those regions, the Antilles not even being used as a resting-place en route. In 
Costa Rica, and in the neighbourhood of Chiriqui, it is found in company with 
G. macgillivrayi ; but in the rest of the State of Panama, and in Colombia, it entirely 
supplants that species, the latter bird taking its place in Guatemala and Mexico. 
In the United States, where this species spends the summer months, it is reported to 
be rare in the Eastern Province, but more abundant in the Mississippi valley, breeding 
in numbers in Minnesota and Eastern Dakota. It also breeds in the State of New York 
and in New England?°. Brewer describes the nest as a massive structure placed about 
a foot from the ground, and composed outwardly of small dry stalks and leaves, with a 
very deep cavity lined with fine black roots. The eggs are pinkish white, marked with 
dots and blotches of varying size of dark purplish brown ®. 
8. Geothlypis macgillivrayi. 
Sylvia macgillivrayi, Aud. Orn. Biogr. v. p. 75, t. 899. f. 4, 5°. 
Geothlypis macgillivrayi, Baird, U.S. Bound. Surv. ii. pt. 2, Birds, p.10*; Rev. Am. B. i. p. 227°; 
Scl. & Salv. Ibis, 1859, p. 10‘; Scl. P. Z.S. 1859, pp. 863°, 373°; Cab. J. f. Orn. 1861, 
p. 84°; Lawr. Ann. Lyc. N.Y. ix. p.94°; Frantz. J. £. Orn. 1869, p. 294°; Salv. Ibis, 1872, 
p. 152"; Baird, Brew. & Ridgw. N. Am. B. i. p. 803"; Coues, B. Col. Vall. i. p. 3812”, 
20* 
