CONNECTICUT WARBLER 241 



CONNECTICUT WARBLER 



OPORORNIS AGILIS (Wils.) Plate XVIII 



Distinguishing Characters. The adult 3 is to be confused only with the 

 adult c? of the Mourning and Macgillivray's Warbler from both of which it is 

 distinguished by its larger size, complete white eye-ring, and absence of black 

 on the breast. The young <$ and ? may be known from the corresponding 

 sex and age of the Mourning and Macgillivray's Warblers by their large size, 

 browner breast, and more conspicuous, complete eye-ring. Length (skin), 4.90; 

 wing, 2.75; tail, 1.85; bill, .48. 



Adult <$, Spring. Upperparts olive-green with a brownish tinge, the crown 

 more or less slaty gray; wings and tail like back and without white markings, 

 bend of wing yellow; a complete white eye- ring; sides of head, throat and upper 

 breast slaty gray paler on the throat, rest of underparts, including crissum, 

 yellow, the sides olive-green. 



Adult 3, Fall. Similar to adult d" in Spring but crown usually browner, 

 gray of breast faintly tipped with brownish. 



Young <$, Fall. Similar to adult c? but crown olive washed with brown, 

 slaty gray of throat and cheeks replaced by yellowish brown paler on the throat; 

 eye-ring tinged with buffy. 



Adult ?, Spring. Similar to adult d but crown brownish olive-green, cheeks, 

 throat and upper-breast brownish paler on throat. Similar to young c? in Fall, 

 but crown more olive. 



Adult $, Fall. Similar to adult ? in Spring but upperparts and breast 

 browner. 



Young ?, Fall. Not distinguishable from adult $ in Fall. 



Nestling. Not seen. 



General Distribution. Eastern United States ; north to Manitoba ; 

 west to the Mississippi River. 



Summer Range. Summer records of the Connecticut Warbler 

 are rare. There is a single record of its breeding in Manitoba; it was 

 found located for the summer in a tamarack swamp near Hickory, 

 Aitkin County, Minn., where it was seen from June 21 onward; it 

 was seen in July on the St. Louis River in eastern Minnesota, and, 

 therefore, probably breeds in that locality; it is claimed to breed not 

 uncommonly in southern Wisconsin ; old with young were seen on the 

 Porcupine Mountains, northern Michigan, July 27, 1904, and undoubt- 

 edly bred there. 



Winter Range. Northern South America; the West Indies in 

 migration. 



Spring Migration. This is one of the few species that seems to 

 travel different routes during the two yearly migrations. The spring 

 migration is through Florida to the Mississippi Valley and thence 

 north to the breeding grounds. The few records of spring migra- 

 tion note the arrival of this species in southern Florida May 4-19; 

 northern Florida, May 10-11; Chester County, S. C., May 10; St. 



