A Stxidy of Sonie Ergatogynic Ants. ;-311 



Ibnnd witli wliicli to compare tliese foims. A rather stränge thing 



was tlif abseilet' of (K-elli in tlie ergatoid form. 



PoiH'ra ('o<(f('t(tf(f nw. pennstjlviinU'Ci Blckley. 



A Single ergatoid form of tliis species occurred in a nest com- 

 posed of males. queens and workers, taken at Colebrook, Conn., and 

 another was taken at Eockford, 111. They differ from the queen in 

 tlie structnre of the thorax. In the queen the pronotum and sternite 

 liave fnsed; the mesonotum, tegulae, paraptera, scntellum and 

 ei>imerite are distinctly separated. The wings are present; the 

 sternite and episternite have fused. The metanotum is distinct; the 

 other parts of the metathorax have fused with the epinotum. 



In the ergatoids the pronotum, mesonotum, paraptera, scntellum, 

 metanotum and epinotum are distinct; the other parts have fused. 

 Tlie eyes of the ergatoids are as large as those of the queen and. 



Fig. H. 



Ponera coarcfata Latr. vnr. pennHylvanica Bccklky. 



Ergatoid female. 



contain about fifty-eight facets (Fig. H). The three ocelli are 

 present in both forms. 



The thorax of the worker has the pronotum, mesonotum and 

 epinotum distinctly separated; the remaining parts have fused. The 

 eyes are very small and contain about ten facets. 



Crenidstof/a.ster mtmittssiind Mayk. 



The Cremastogaster minutissima usually has several queens present 

 in the nest, a condition very infrequent in our species of Cremasfo- 

 ijastcr. lu a Single nest, whicli was taken at New Braunfels. Texas, 

 three ergatoids were found, along with queens, large and small 

 workers, eggs and larvae. In size the ergatoids approach the queen. 



20* 



