498 bulletin: museum of comparative zoology. 



38. Egretta dimorpha Hartert. 



Seven specimens, both sexes, three in the grey phase of plumage, 

 three in the white phase, and one partly grey and partly white, 

 fifteen kilometers east of Tulear, Tiilear, Miandrivazo, Ambola, 

 southwestern coast, and Berevo, June, July, and August. 



This very distinct species, lately described by Hartert, had previ- 

 ously been confounded with Dcmigrelta gularis (Bosc). It is a com- 

 mon heron in southwestern Madagascar. 



39. Nycticorax nycticorax nycticorax (Linne). 



Two specimens, an immature 9 and an unsexed adult, Tulear, and 

 Miandrivazo, June. 



So far as I can judge by two examples, there is nothing peculiar 

 about the Madagascan Night Heron. It is a rather uncommon 

 bird on the island. 



40. Butorides atricapilla rutenbergi (Hartlaub). 



Six specimens, immature and adults of both sexes, Tulear, Moron- 

 da va, and Maevatanana, July, August, and September. 



41. Ardeola idae (Hartlaub). 



Twenty-two specimens, immature and adults of both sexes, Mian- 

 drivazo, southern end of Lake Alaotra thirty miles south of Berevo, 

 fifteen kilometers east of Tulear, Sahabe River, Mahabo, Maeva- 

 tanana, and Berevo, June, July, and August. 



One old cf , taken September 25, M. C. Z. 77,438, has the black- and 

 white-striped occipital plumes very long, 174 mm. in length. No 

 other specimen, among those in apparently full nuptial plumage 

 approaches this one in this respect. 



42. BuBULCUS IBIS IBIS (Linne). 



Thirty-one specimens, immature and adult of both sexes, Miandri- 

 vazo, Upper Siribihina River, Maevatanana, Morondava, Tulear, 



