NORTH AMERICAN BIRDS. 419 



Ten eggs measure .S2x.56. .80x.56, .82x.58, .84x.59, .85x.58, .87x.54, .87x.56, .85X.53, 

 .86X.53 .88X.54. The average size of these ten specimens is .85x.56 Inches. 



625. YELLOW-GBEEN VIREO. Vireo fiavovirldis (Cass.) Geog. Dist.— 

 Valley of the Lower Rio Grande in Texas southward to Panama, Ecuador, Peru and 

 Upper Amazon. Accidental at Godbout, Province of Quebec, and at Riverside, Cali- 

 fornia. 



This Vireo is very similar to Tireo oUvaeeus. Its nest and eggs are described as 

 being the same as those of the Red-eye. 



626. PHILADELPHIA VIREO. Vireo philadelphicus (Cass.) Geog. Dist.— 

 Eastern portion of North America, north to Hudson Bay; south in winter to Guate- 

 mala and Costa Rica, etc. 



r This is apparently not a very common bird, wherever found in Eastern United 

 States. From its close resemblance to the Warbling Vireo the bird is doubtless 

 often confounded with that species. In portions of the Mississippi Valley it appears 

 to be more common than in the Eastern States., occurring regularly and in con- 

 siderable numbers during the spring and fall migrations. In Ohio it is not a very 

 common spring and fall migrant in May and September. Prom the best information 

 at hand, the Philadelphia or Brotherly-love Vireo breeds chiefly north of the United 

 States. Mr. Ernest E. Thompson found a nest of this species containing four eggs 

 near Duck Mountain, Manitoba, June 9, 1884. These were probably the first authen- 

 tic eggs of this species on record. The nest was hung from a forked twig, about 

 eight feet from the ground, in a willow which was scant of foliage, as it grew in the 

 shade of a poplar grove. The nest was pensile, as usual with the genus, formed of 

 grass and birch bark. The eggs presented no obvious difference from those of the 

 Red-eyed Vireo. The eggs were accidentally destroyed before they were measured.* 



627. WARBLING VIREO. Tireo ffilvus (Vieill.) Geog. Dist.— North America 

 in general, from the Fur Countries; south in to Mexico. 



The Warbling Vireo,, in its two forms, inhabits North Amrica in general and 

 is abundant. The form y. g. swainsoni, which is described as the smaller, with 

 slenderer bill, etc., occurs in Western United States. Every collector is doubtless 

 familiar with the incessant, mellow warblings of this Greenlet, as it rambles through 

 the foliage of trees in open woodland, in parks, and in those along the banks of 

 streams. In these places it dilligently searches the under sides of leaves and 

 branches for insect life, "in that near-sighted way peculiar to the tribe." It is one 

 of the most stoical of birds, and seems never surprised at anything; even at the loud 

 report of a gun, with the shot rattling about it in the branches. If uninjured, it will 

 stand for a moment unconcerned, or move along, peering on every side amongst the 

 foliage, warbling its tender, liquid strains. The nest of this species is like that of the 

 Red-eyed Vireo — a strong, durable, basket-like fabric, made of bark strips, and fine 

 grasses on the inside. It is suspended by the brim in slender, horizontal forks of 

 branches, usually at a greater height than the nest of the Red-eye. The nesting 

 time is in May and June. The eggs are spotted, frequently blotched at the larger 

 end with brown and reddish-brown on a clear white ground — sometimes over the 

 surface will be found small specks of reddish-brown. The complement of eggs is 

 three or four; size, .70 to .77 in length by about .55 in breadth. Seven eggs, taken in 

 Ohio, measure '.70X.51, .73x.50, .74x.53, .75x.52, .72x.55, .74x.55, .77x.53; four from 

 California, .72x.50 .72x.53 .70x.53 .73x.51. 



*Auk, II, pp. 305-306. 



