16 



ARKIV FÖR ZOOLOGI. BAND 13. NIO 4. 



Colour: 



Edgings on outer webs 



of tertials. 

 Edgings on outer webs 



of innermost seconda- 



ries. 

 Chin and middle of upper 



throat. 



Under parts. 



Longest featbers of under 



tail-coverts 

 Thigha. 



Edge of wing. 



B. v. hypernotius 



Ochraceous buff. 



Cream buff or vvhitish. 



Creara white, streaked 

 with brownish black 

 on upper throat. 



Deep slate gray, with a 

 decided brownish tinge, 

 middle of abdomen and 

 crissum a little paler, 

 the latter whitish. 



With large black subter- 

 minal patches. 



Brownish gray, raore ruf- 

 escent exteriorly. 



Broadly buffy white. 



B. v. margaritophilus 



White. 



White. 



Narrowly light tawny 

 ochraceous, streaked 

 with blackisb, especi- 

 ally on throat. 



Brownish slate. 



With paler edgings. 



Exteriorly dark, rufes- 



cent brown. 

 Broadly creamy white. 



About the same series from San Miguel Thayer and Bångs 

 (1. c.) remarked, that some birds have the throat white, others 

 rufous, and others again have it either white or rufous heavily 

 striped with black. «The color of the belly varies from olive 

 gray in some individuals to brownish slate color in others». 



As may be seen of what is said above, the differences 

 stated between the Green Heron of the Pearl Islands and that 

 of the mainland opposite, are very inconsiderable, and I cannot 

 help suspecting, that in a further research, both forms, if 

 sufficient consideration is taken regarding differences depen- 

 dent upon individual variation, ages, season, and bleaching, 

 would prove to be identical. 



Unfortunately I have but this single specimen from the 

 Pearl Islands but no material from southern Central America. 



The measurements in the present specimen are as follows: 



wing 170, tail 62, exposed culmen 57, height of bill at 

 base 11, tarsus 44,7, middle toe 40. 



Thus it agrees (except in tarsus and tail) with both the 

 races. 



The målar stripe is tawny-ochraceous; the plume-like 

 feathers of back and scapulars are metallic bottle green washed 

 with glaucous; the outer webs of outermost tertials and inner- 

 most secondaries margined very narrowly with white; chin 



