_Oporornis philadelphia._ Mourning Warbler.--Weight data presented elsewhere. The birds killed at Topeka provide the latest fall dates for this species in Kansas. Fifteen were killed on September 25, 64 on October 1, 2 on October 5, 11 on October 6, 2 on October 7, and 1 on October 8. We find no other records later than September 15. Of 93 specimens examined, 1 was excessively fat, 22 were very fat, 45 were fat, 21 were moderately fat, and 4 had little fat. The abundance of this secretive species in the sample was a great surprise. It had previously been considered a rather rare migrant in this area. _Geothlypis trichas occidentalis [>brachidactyla?]._ Yellow-throat.--Weight data presented elsewhere. This species was second in numbers only to the Nashville Warbler in the total kill at Topeka. Of 167 birds examined, 29 were very fat, 114 were fat, 23 were moderately fat, and 1 had little fat. The Yellow-throats are greatly in need of meaningful and comprehensive revision, which to date has been restricted to the western subspecies (Behle, 1950). Since the appearance of the 1931 A. O. U. Check-List a great deal of scattered taxonomic work on the species, as yet unsynthesized, has made the picture of its geographic variation a blurry one so far as the details are concerned. Made in the absence of adequate comparative material, the above identification is to be regarded as tentative. Also, it is, unfortunately, based only on those 6 of our 176 specimens preserved as skins. Five of these are adult males, the sixth being an immature female. Compared with a series of Kentucky specimens regarded as typical _brachidactyla_, these birds are paler and brighter above (tending toward gray-green rather than brownish olive), brighter and more extensively yellow below, with broader, more nearly white superciliary stripes above their black masks (in males). In size they are close to _occidentalis_ (see Behle, 1950:202). Five males have an average wing-length of 56.6 mm. (53-59); one female measures 53. Six males from Kentucky: 55.1 (53-56); four females, 51.1 (48-56). Our birds may be assumed to have stemmed from a population to the north and west which, if not _occidentalis_ (or _campicola_ Behle and Aldrich, of which no comparative material is at hand), is intermediate between _brachidactyla_ and more western birds. Judging from Behle's map (1950:fig. 32), these birds may have come from an area near the confluence of three subspecies (_campicola_, _occidentalis_, _brachidactyla_). Long (1940:452) reports three subspecies breeding in Kansas (_brachidactyla_, northeast; _occidentalis_, west; _trichas_, southeast). The occurrence in Kansas of _G. t. trichas_ as currently understood is completely out of the