NO. IfilG. REVTf^ION OF BUTOIiTDESt VTREl^CENS—OBERnOLStER. 553 



Measurements. — Probuljlc male:* Wing, 179 mm.; tail, 67; exposed 

 culmen, 60.5; height of bill at base, 11.2; tarsus, 48.5; middle toe, 44.5. 



Type-locality. — Swan Island, Caribbean Sea, Honduras. 



Geographical distribution. — Swan Islands, Cari])bcan Sea, Honduras. 



In both size and color this subspecies is nearest Butorides virescens 

 frazari. It differs materially from Butorides virescens virescens in its 

 darker i)]umago throughout, including upper surface and edgings of 

 superior wing-coverts; and in restriction of median light strij)e on 

 jugulum and upper breast. It has longer wings and tail than Buto- 

 ridis virescens liypemotius, and in color is sej>aral)]e from the hitter 

 as from Butorides virescens virescens. 



The type is the only specimen known, l)ut this form is doubtless 

 resident and endemic on the Swan Islands. 



BUTORIDES VIRESCENS MARGARITOPHILUS, new subspecies. 



CJiars. s uhs p. —Sim'Aiir to Butondes virescens liypemotius, but 

 smaller throughout, particularly the wirig, tail, and exposed culmen; 

 posterior lower parts darker; neck and sides of head more rufescent 

 (less purplish); median white stripe on throat, jugulum, and breast 

 much reduced, often almost obliterated on breast and jugulum, giv- 

 ing tluis a much less streaked appearance to the anterior lower parts; 

 center of tlu*oat often tinged with ochraceous, instead of beingpure 

 white as in Butorides virescens liypernotius. 



Description.— Tji^c, adult male. No. 200442, U.S.N.M.; San 

 IMiguel Island, Pearl Islands, Bay of Panama, Panama, March 13, 

 1904; Wilmot W. Brown, jr. Pileum, occipital crest, postocular 

 region, and a short subauricular streak, deep, glossy bottle green; 

 narrow malar stripe tawny ocliraceous; submalar stripe purplish 

 maroon mixed with blacldsh ; cheeks, aiu-iculars, and neck all around 

 pur])lish maroon, somewhat more rufescent anteriorly, somewhat 

 glaucous posteriorly, the foreneck very narrowly and sparingly 

 streaked medially with white, and also broadly though inconspicu- 

 ously with dull, dark brown; upper sm-face of body deep bottle green, 

 somewhat glossy, the long, pointed, plimae-like feathers of back and 

 scapidars glaucous and somewhat bluish; wings fuscous, the prmiaries 

 and outer secondaries dull, dark, greenish-blue slate color; tertials, 

 outer webs of inner secondaries, \vitli the su})erior wing-coverts, dark, 

 glossy bottle green; the first rows of lesser wing-coverts margined 

 rather narrowly all around with tawny ochraceous, the remaining 

 rows and the median coverts with buff, the greater coverts and outer 

 webs of tertials and innermost secondaries with white; tail dark, 

 glossy bottle green; chin and middle of upper tliroat narrowly light 

 tawny ochraceous, the former very sj)aringly, the latter heavily, 

 streaked with blackish; breast and entire posterior lower parts, 



' One specimen (the type, No. 1U281, U. S. N. M.), from Swan Island, Caribbean Ste, collected March 

 6, 1887, by Mr. Charles H. Towusend (original number, 1818). 



