Vol "^i9 XVI ] Howell, A New Seaside Sparrow. 87 



web with cinnamon, the terminal portion darker and margined with buffy 

 white; under-parts white, heavily streaked on chest, sides, and flanks with 

 dark fuscous, the same areas faintly washed with cinnamon; under tail 

 coverts white, tinged with cinnamon and streaked with fuscous; thighs 

 drab; lining of wings dull white, mottled with hair brown; upper mandible 

 blackish, lower mandible dark mouse gray. 



Measurements. — Type (adult male): wing, 57; tail, 51; exposed cul- 

 men, 12; depth of bill at base, 6.5; tarsus, 22; middle toe, 17. Average 

 of five adult males: Wing, 58.2 (57-60); tail, 51.4 (50-53); exposed cul- 

 men, 12.1 (12-12.5); depth of bill at base, 6.6 (6.5-7); tarsus, 21.9 (21.5 

 -22); middle toe, 16.8 (16-17). One adult female: 53; 47.5; 12.5; 7; 

 22; 16. 



Remarks. — This species differs so strikingly from all the other 

 Seaside Sparrows that intergradation with any of the forms seems 

 very improbable. From its nearest geographical neighbor, Thryo- 

 spiza maritima pcninsulae, occupying the west coast of Florida 

 from Tarpon Springs northward, mirabilis differs more than from 

 other races of that species. Its closest affinities are with Thryospiza 

 maritima sennetti, which inhabits the coast of Texas; it differs 

 from this and from all other races of maritima in its more extensively 

 white under-parts, with more sharply defined streaking, and more 

 greenish upper-parts. In size, and in the white under-parts with 

 sharply defined streaks, it approaches Thryospiza nigrescens of the 

 east coast of Florida, but differs widely from that species in the 

 color of the upper-parts. 



Individual variation is not extensive; in some specimens the 

 streaks on the under-parts are mouse gray instead of fuscous; the 

 tail feathers vary from mouse gray to hair brown, and in all speci- 

 mens except the type the white tips are nearly or quite obsolete 

 (probably worn off) ; the single female examined is washed beneath 

 with olive-buff. 



The limits of the range of this species are at present unknown, 

 but probably it is confined to the coastal marshes in the vicinity 

 of Cape Sable, where doubtless it is a permanent resident. It is 

 known from six specimens taken there by the writer between Feb- 

 ruary 13 and 18, 1918. The species appeared to be only moderately 

 numerous in the area traversed. 



