THE DEVELOPMENT Ol : ANTS. 



79 



least, is not a very recent development. The shape and color of 

 the cocoon differ considerably in different species. In Lepto</cnys, 

 for example, it is very long and slender and of a dark-brown color, 

 in Lasins and Formica it is a pale buff or whitish and broadly elliptical, 

 in I'oucra pennsylvanica it is oblong and sulphur yellow. 



FIG. 45. Caniponotus americanus X 2. (Photograph by J. G. Hubbard and Dr. 

 O. S. Strong.) a, Kps : b. youni> larva.- ; c. older larva.-: </, worker cocoons; e, female 

 cocoon : /. worker major pupa removed from cocoon : g, worker media in the act 

 of hatching; /;, major workers; i, minor workers; k, virgin female; /, males. 



Little attention has been paid to the coloration of the callows as 

 compared with the mature ants. In certain species, when the latter 



