_Voice._--Aretas A. Saunders sends me the following note on the song of this warbler: "I have had few opportunities to study the song of the Cape May warbler, and have only five records. These show that the song is weak, high-pitched and somewhat sibilant. The notes are mainly all on one pitch, in even rhythmic time and from eight to eleven in number. They are pitched on E´´´´ and F´´´´. Two of the songs have one or two notes, near the end, a half-tone higher in pitch than the others. The songs are from 1-3/5 to 2 seconds in length." Francis H. Allen (MS.) heard one singing and feeding in some Norway spruce in West Roxbury, Mass., on May 10. "He had _chip_ notes very much like a familiar note of the chipping sparrow. (I have also recorded a _prssp_ like that of the black-poll warbler but fainter and sometimes doubled.) This bird had a variety of songs. The simplest one resembled the black and white warbler's song and a short simple song of the redstart, but was thinner and harder in quality than the latter. Then there were other, more elaborate songs, some divided into two parts and some into three. Two or three times he sang several times with no pauses between, making what was practically a long continuous song. The chief characteristic of the songs, I should say, was short and staccato double notes, the latter part of which were very high-pitched. These repeated several times formed the simplest of the songs. The song in three parts reminded me of that of the Tennessee warbler, but was higher pitched and not so full and loud. The bird had long periods of silence, but sang freely when he did sing." Brewster (1938) says that "the song of this Warbler is harder--or at least sharper and more penetrating--than that of either the Bay-breast or Blackburnian. In these respects it resembles the song of _Protonotaria_ but the tone or quality is more wiry and, indeed, very close to that of _Mniotilta_." _Field marks._--The adult male Cape May warbler should be unmistakable in his brilliant spring plumage, with his black cap, chestnut cheeks, white lesser wing coverts, and bright yellow breast conspicuously streaked with black. The female lacks the black cap and chestnut cheeks; her breast is pale yellow streaked with pale dusky; and all her colors are duller. Young birds are much like the female, but are still duller in coloration. See descriptions of other plumages. The tail-tilting habit is quite pronounced. _Fall._--The fall migration starts in August and is prolonged through September, or even into October or a little later. The birds are numerically more abundant in the fall because of the large families of young, but they are less conspicuous while the foliage is still on the trees and while they are clad in dull autumn and immature plumages. Deciduous woods seem to be their favorite haunts at this season. The migration route is a reversal of the spring route, the main flight being between the Mississippi and the Alleghenies.