roLiorriLA. 569 



branch, deeplj' cup-shapod, voiy compact, composed of ])Iant-fibrcs ami other 

 felted materials, lined with soft feathers, and often beautifully decorated exte- 

 riorly with variously colored lichens. E^JJS 3-5, greenish or bluish white, speckled 

 with brown. 



a'. Exposed portion of outer tail-feather entirely white. 



V-. Top of head in adult males plumbeous-blue, bordered anteriorly and later- 



allj- bj- a black line ; in female, bluish ash-gray, not markedly different 



from lighter gray of sides of head. 



c'. Lower parts white medially, pale ash-gray laterall}-; upper parts clear 



gra3'ish blue or plumbeous, deeper on top of head, decidedly ]ialer 



on rump; length 4.05-5.50, wing 2.00-2.20 (2.07), tail 2.05-2.20 



(2.15). Kest always (?) beautifully decorated with lichens. Eggs 



.56 X .43. Hab. United States, chiefl}' south of 42°, wintering in 



Gulf States, western Cuba, Bahamas (occasionally), Me.xico, and 



(990 Guatemala 751. P, caerulea (Linn.). Blue-gray Gnatcatcher. 



c'. Lower parts light bluish gray, deeper laterally ; upper parts deep bluish 

 plumbeous, somewhat bluer on top of head, but scarcely, if at all, 

 paler on rump ; about the size of P. ccerulea. Hub. Bahamas 

 (Abaco and New Providence ; resident) ; Cozumel ? 



P. caerulea csesiogaster RiDOW. Bahaman Gnatcatcher.' 

 W. Top of head in adult males glossy black ; in females and j'oung dark bluish 

 gray or plumbeous, abruptly contrasted with whitish of sides of head 

 (the latter sometimes including a distinct superciliary streak), 

 c'. Tertials broadly and conspicuously edged with pure white. 



d}. Lores partly (sometimes entirely) white; occiput (in adult male), 

 as well as crown and forehead, glossy black ; length about 

 4.00-4.25, wing 1.90-2.00, tail 1.90-2.10. Hab. Soutlaern Mex- 

 ico (Tehuantepec, etc.), Guatemala, Salvador, and Nicaragua. 



P. albiloris ScL. & Salv. White-lored Gnatcatcher.' 



(P. Lores entirely black in adult males, dull grayish in females and 



young. 



e". Otherwise like P. albiloris; length about 4.25-4.50, wing 1.85- 



2.10, tail 2.00-2.20. Hab. Brazil (Bahia, etc.) to Nicaragua. 



P. leucogastra (Max.). Maximilian's Gnatcatcher.' 



e'. Smaller, and with occiput light bluish gray, like hind-neck, 



back, etc.; length 3.75, wing 1.85, tail 1.75. Htb. Yucatan. 



P. albiventris Lawk. Lawrence's Gnatcatcher.* 



c*. Tertials inconspicuously edged with dull graj-ish white or light grayish. 



J}. Lores, superciliary region, and upper half of car-coverts gloss}- 



black in adult male, ash-gray in female and young; length 



' New subspecies ; f cvcntcon !i]icciinens examined. 

 ' Polinpiila albilori, Scu A Salt., P. Z. S. 1860, 29S. 



• Sylrin leucognttra Max., Biitr. iil. 1S.'?1, 710. P:l!nj,lila leiiroynnlrn ScL., Cat. Am. B. 1862, 12. 

 « Polioptila aWlctulrit Lawr., Ann. X. Y. Ac. Sci. iii. Xo. 9, 18S5, 2T3. 



72 



