l;:^0 BIRDS OF BRITISH GUIANA. 



Genus ZEBRILUS Bonap. 



Zehrihis Bonaparte, Compt. Rend. Paris, xl. p. 723, lS5o. T^'pe 

 Z. nndtilatiis (Gmel.). 



Tail-feathers ten in number ; malar region and lower portion 

 of tibia3 completely feathered ; bill and feet small ; culmen about 

 equal to the tarsus in length, both exceed that of the middle 

 toe and claw. 



113. Zebrilus undulatus. 

 Zigzag Bittern. 



Zehrihts nmhdotus (Gmel.), Syst. Nat. i. p. 637, 1789 ("Habitat in 

 Cayenna"); Brabourne & Chubb, B. S. Amer. i. p. 52, no. 487, 

 1912. 



Zehrihis pumilis Quelch, Timehri (2) iv. p. 843, 1890 (Berbice River) ; 

 Sharpe, Cat. B. Brit. Mas. xxvi. p. 241, 1898 (British Guiana). 



Adull {dark- pJuisc). General colour above black with minute 

 wavy buff cross-bars and frecklings ; some of the nuchal crest- 

 feathers are uniform black like the tail and ([uills, the latter being 

 white at the base on the inner webs; under surface buff heavily 

 blotched and thickly freckled with black ; untler wing- coverts 

 paler buff with a white patch at the base of the quills. 



Total length 2G5 mm., culmen 42, wing 135, tail 40_, tarsus 13, 

 middle toe and claw 38. 



The bird described was collected on the Abary River in 

 September 1907. 



Adult (rn/otis phase). General colour above blackish with 

 narrow wavy rufous cross-lines on the back and wings ; forehead 

 maroon-chestnut — this colour also pervades the hinder crown ;ind 

 nape; sides of face and sides of the neck deep rufous, becoming- 

 paler on the throat and breast ; abdomen similar in colour to the 

 throat but less mixed with white in the middle, and on the under 

 tail-coverts and under wing-coverts ; the feathers on the abdomen 

 and sides of the body have dark shaft-streaks. 



Total length 325 mm., culmen 37, wing 141, tail dS, tarsus 40, 

 middle toe and claw 37. 



There are four examples of this species in the McConnell 

 collection, which are all of the dark phase. The description 

 of the rufous phase is taken from a specimen in the British 

 Museum, collected by Sir Everard im Thurn on the C^orentyne 



