Smithsonian Report. 1930. — Chapman 



PLATE 2 



■^-■''^J.^ *N 





1. The Zarhynchus colony in the sand-box tree, from the point at which, with the aid of a 24-power 

 binocular, most of the observations on which this paper is based were made. The roof of the main 

 laboratory building appears in the right foreground. Photographed with a 14-inch lens. 2. Eight 

 females of Zarhynchus beginning to build their nests in the sand-box tree. Group 1 of the colony of 

 1927, January 8. An old nest hangs at the left of those under construction. (See p. 438.) Photo- 

 graphed with a 14-inch lens, from the laboratory level 



