RENDAHL, BIRDS FROM THE PEARL ISLANDS. 17 



and midclle of upper throat cream white streaked with blackish 

 brown on upper throat; the lower under parts are of a colour 

 between slate-gray and neutral gray, clearest on the under 

 tail-coverts and in the middle part of the feathers towards 

 their outer parts with a decided brownish tinge; the longest 

 feathers of under tail-coverts are without paler edgings but 

 with a large subterminal patch of darker colour (a slate colour 

 intermixed with a greenish colour); the thighs are drab and 

 not at all rufescent exteriorly; the edge of wing, a broad creamy 

 white. 



As will be seen by this description the present specimen 

 shows characters agreeing both with Oberholser's margarito- 

 philus and hypernotius. With regard to the great individual 

 variation in the species, I think it impossible with such a re- 

 stricted material as Mr. Oberholser had at his disposition 

 (of margaritophilus 12 males and 9 females, of hypernotius 

 14 males from Colombia, Venezuela to Costa Rica and 6 fe- 

 males from Panama and Costa Rica) to distinguish two sub- 

 species by so slightly different and average characters. Until 

 this question by further researches has been decided, I think 

 it better with these objections to retain Oberholser's B. v. 

 margaritophilus. 



Dr. Bovallius says, that he observed the Green Heron 

 (named by the inhabitants «Don Diego») in several of the 

 Islands. 



Thayer and Bångs state the finding on March 15th of a 

 nest containing fresh eggs. 



10. Heterocnus cabanisi (Heine) 



No former statements from the Pearl Islands. 



Bovallius' Collection: 1 c^, young, Bayoneta, April 18. 



The meeting with Cabanis' Tiger-Bittern in the Pearl 

 Islands is not specially remarkable, as this species before has 

 been recorded from the Bay of Panama (Cat. Stridd. Coll. p. 

 520 and Cat. Birds Brit. Mus. XXVI p. 198). 



Dr. Bovallius unfortunately does not state whether 

 he found the bird breeding in the Archipelago. 



Arkiv för zooloffi. Band 13. N:o 4 



