POLIOPTILA. 569 
branch, deeply cup-shaped, very compact, composed of plant-fibres and other 
felted materials, lined with soft feathers, and often beautifully decorated exte- 
riorly with variously colored lichens. Eggs 3-5, greenish or bluish white, speckled 
with brown. 
a’, Exposed portion of outer tail-feather entirely white. 
b'. Top of head in adult males plumbeous-blue, bordered anteriorly and later- 
ally by a black line; in female, bluish ash-gray, not markedly different 
from lighter gray of sides of head. 
ce’. Lower parts white medially, pale ash-gray laterally ; upper parts clear 
grayish blue or plumbeous, deeper on top of head, decidedly paler 
on rump; length 4.05-5.50, wing 2.00-2.20 (2.07), tail 2.05-2.20 
(2.15). Nest always (?) beautifully decorated with lichens. Hggs 
56 X 43. Hab. United States, chiefly south of 42°, wintering in 
Gulf States, western Cuba, Bahamas (occasionally), Mexico, and 
(99.) Guatemala........ 751. P. caerulea (Liny.). Blue-gray Gnatcatcher. 
é. 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. cerulea. Hab. Bahamas 
(Abaco and New Providence; resident) ; Cozumel ? 
P. cerulea cesiogaster Ripaw. Bahaman Gnatcatcher.! 
b% Top of head in adult males glossy black; in females and young 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. 
ad. 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. Southern Mex- 
ico (Tehuantepec, etc.), Guatemala, Salvador, and Nicaragua. 
P. albiloris Sct. & Satv. White-lored Gnatcatcher.? 
d?. Lores entirely black in adult males, dull grayish in females and 
young. 
é. 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. 
é&, Smaller, and with occiput light bluish gray, like hind-neck, 
back, etc.; length 3.75, wing 1.85, tail 1.75. Hab. Yucatan. 
P. albiventris Lawrz. Lawrence’s Gnatcatcher. 
@. Tertials inconspicuously edged with dull grayish white or light grayish. 
d@. Lores, superciliary region, and upper half of ear-coverts glossy 
black in adult male, ash-gray in female and young; length 
1 New subspecies; seventeen specimens examined. 
2 Polioptila albiloris Scu. & Satv., P. Z. 8. 1860, 298. 
8 Sylvia leucogastra Max., Beitr. iii. 1831, 710. Potioptila leucogastra Scu., Cat. Am. B. 1862, 12. 
4 Polioptila albiventrie Lawr., Ann. N. Y. Ac. Sci. iii. No, 9, 1885, 273. 
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