4G2 Dr. E. Lonnberg on Birds from 



- 21. Herodias egretta (Wilson). 



Single specimens were seen here and there on swamps and 

 rivers, but they were very shy. A specimen was shot at 

 Colonia Crevaux, in April 1902. 



22. Nycticorax tayazuguira (Vieill.). 

 March 26th, 1902 ; Tatarenda. Iris yellow. 



A young bird in transitional plumage, probably belonging 

 to this species, was shot at Tatarenda in March. 



23. Syrigma cyanocephalum (Molina). 



Two specimens from Tatarenda. Both have the feathers 

 of the nuchal crest tipped with isabelline or the same colour 

 as the feathers of the neck. The crown is very dark slate- 

 coloured, inclining to black with a bluish-grey tinge. Iris 

 steel-grey. The bill seems to have been red, with black 

 tip. Length of the tarsus in one specimen 85, in the other 

 90 mm. Otherwise both agree with the description and 

 the measurements in Cat. Birds Brit. Mus. 



This bird, found in pairs at the lakes, seems to be new 

 to Bolivia. 



24. TlGRTSOMA MARMORATUM (Vieill.). 



A young specimen (iris brown) shot at Tatarenda on 

 March 24, 1902, seems to belong to this species. Crown 

 chestnut, with V-shaped black spots. Neck tawny, almost 

 chestnut behind, lighter on the sides, with black trans- 

 verse bars. Sides of head tawny, with blackish streaks. 

 Middle of throat clothed with white feathers, with small 

 buff and brown spots. Feathers of fore-neck white, with a 

 transverse blackish bar, bordered on both sides with tawny. 

 On the breast there are several bars on each feather. In 

 other respects the coloration resembles that of the young 

 Tiger-Bittern as described in Cat. Birds Brit. Mus. 



- 25. Heterocxus bolivianus, n. sp. 



This bird resembles Tigrisoma as well as Heterocnus in 

 coloration. That it belongs to the latter genus, however, 

 is proved by the fact that a median feather-stripe is 

 continued on the throat almost to the vertical through 



