436 REPORT OF NATIONAL MUSEUM, 1892. 



motacilla) have built their nest. The male and female birds are seen 

 approaching it. as they leisurely hop along the roots and twigs of 

 plants which protrude from the side of the bank. 



Of all the specimens on exhibition in the collections of the American 

 Museum, none have a greater attraction for the observer and visitor 

 there than the admirable series of bird groups, and one of the most 

 life-like of these is the beautiful subject of the third plate in this series 

 (Plate xciv). It represents a pair of robins (Merula migratoria) with 

 their nest in an apple tree, the latter being in full bloom of early sum- 

 mer. • 



The fourth plate in the supplemental series (Plate xcv) represents a 

 group of opossums (Didelphis virginiaiia), male, female, and a number 

 of young ones. In many respects it resembles the similar groups of 

 these animals which are to be seen in the U. S. National Museum, and 

 which have been described in the body of this paper. The group rep- 

 resented in this plate was prepared and designed by Mr. Jenness .Rich- 

 ardson at the American Museum of Natural- History in 1891. It is an 

 especially fine piece of work, and although it does not contain as many 

 specimens as the National Museum group, it is hardly the less instruc- 

 tive on that account. 



In so tar as the larger mammals are concerned, there is probably not 

 a piece- in the entire collection of the American Museum of Natural 

 History that can in any particular compare with the superb specimen of 

 the huge pachyderm shown in Plate xcvi. It is the Indian rhinoceros 

 "Bombi" (Rhinoceros unicornis L.). This specimen was mounted at the 

 American Museum of Natural History in 1890 by Mr. Richardson and 

 his assistants. The data for the work consisted in measurements taken 

 from the animal when alive, and also from a photograph obtained at 

 the same time. After having been mounted, it was properly colored 

 after a living specimen in the Zoological Gardens of Philadelphia. It 

 is probably one of the best mounted specimens of this species in the 

 United States. 



