332 Annals Entomological Society of America [Vol. VIII, 
left the nest with their larve and pupze when it was violently 
shaken. Although I did not see the larve in the act of being used 
as shuttles in the construction of the nest, there can be no 
doubt that they are thus employed. The pupe were all enclosed 
in white cocoons like those of other small species of Camponotus. 
FIGURE 1 
Fig. 1. Silken nests of Camponotus (Myrmobrachys) formiciformis from Guatemala, 
about one-half natural size. 
The workers, however, unlike those of nearly all the species of 
the genus, were monomorphic as in the various species of 
(Ecophylla and Polyrhachis. In C. senex the workers are also 
practically monomorphic, so that it would seem that the habit 
of employing the larve for spinning the nest tends to make them 
develop into adults of uniform stature and shape. It is not 
easy to understand why this should follow. 
