1. T. mustelinus. Beneath nearly pure white, with rounded blackish spots over the whole breast, sides, and upper part of abdomen; wing, 4.25; tail, 3.05; culmen, .80; tarsus, 1.26. _Hab._ Eastern Province United States, south to Guatemala and Honduras. Cuba and Bermuda of West Indies. 2. _Spots beneath triangular, on breast only._ B. Entirely uniform in color above,—olivaceous, varying to reddish or greenish with the species. Beneath whitish, with a wash of brownish across the breast and along sides. Spots triangular, and confined to the breast. Nest on trees or bushes; eggs blue spotted with brownish; except in _T. fuscescens_, which nests on the ground, and lays plain blue eggs. _a. No conspicuous light orbital ring._ 2. T. fuscescens. Yellowish-rufous or olive-fulvous above; a strong wash of pale fulvous across the throat and jugulum, where are very indistinct cuneate spots of same shade as the back. Wing, 4.10; tail, 3.00; culmen, .70; tarsus, 1.15. _Hab._ Eastern Province of North America. North to Nova Scotia and Fort Garry. West to Great Salt Lake. South (in winter) to Panama and Brazil. Cuba. 3. T. aliciæ. Grayish clove-brown above; breast almost white, with broad, blackish spots; whole side of head uniform grayish. Wing, 4.20; tail, 3.20; culmen, .77; tarsus, 1.15. _Hab._ Eastern Province North America from shore of Arctic Ocean, Fort Yukon, and Kodiak to Costa Rica. West to Missouri River. Cuba. _b. A conspicuous orbital ring of buff._ 4. T. swainsoni. Greenish-olive above, breast and sides of head strongly tinged with buff. Spots on breast broad, distinct, nearly black. Length, 7.00; wing, 3.90; tail, 2.90; culmen, .65; tarsus, 1.10. _Hab._ Eastern and Middle Provinces of North America. North to Slave Lake, south to Ecuador, west to East Humboldt Mountains … var. _swainsoni_. Brownish-olive above, somewhat more rufescent on wing; breast and head strongly washed with dilute rufous. Spots on breast narrow, scarcely darker than back. Wing, 3.85; tail, 3.00; culmen, .70; tarsus, 1.10. _Hab._ Pacific Province of United States. Guatemala … var. _ustulatus_. C. Above olivaceous, becoming abruptly more reddish on upper tail-coverts and tail. Spots as in _swainsoni_, but larger and less transverse,—more sharply defined. An orbital ring of pale buff. Nest on ground; eggs blue, probably unspotted. 5. T. pallasi. Olivaceous of upper parts like _ustulatus_. Reddish of upper tail-coverts invading lower part of rump; no marked difference in tint between the tail and its upper coverts. Flanks and tibiæ yellowish olive-brown; a faint tinge of buff across the breast. Eggs plain. Wing, 3.80; tail, 3.00; culmen, .70; tarsus, 1.20. _Hab._ Eastern Province of United States (only?) … var. _pallasi_.