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WHEELER. 



tribute much to our knowledge of the group, it seems advisable to 

 begin with a brief resume of what has been accomplished in correlating 

 the various phases of Eciton, both in South and North America. 



The following table gives a conspectus of the number of described 

 species of the genus and the various subgenera and the number of 

 known phases. It will be seen that of the 104 species described up to 

 date, 38 are known only from worker specimens, 52 only from males 

 and that we know both the worker and male of 8 and all three phases 

 of only 6 species. 



The first female Eciton to be discovered was that of E. (L.) coeciim 

 Latr., and was described by Ernest Andre in 1885 from Mexico under 

 the name of Pseudodichthadia inccrta. The insect measured 25 mm. 

 (gaster alone 20 mm.). Although coecum is a common species from 

 Argentina to Texas a second female has not since been captured. Nine 

 years later the Rev. Jerome Schmitt, O. S. B., took a female of E. (A.) 

 opacithorax Emery at Belmont, North Carolina, and permitted me to 

 publish a figure and description of it (1901). In 1900 and 1901 and 

 during more recent years I have taken several females of this species 

 and of E. (A.) schmitti Emery in the Southwestern States. Forel, 

 while on a visit to North Carolina in 1899 captured the female of 

 E. (A.) carolinense Emery, and Mr. W. T. Davis captured both the 

 female and male of this species from a colony at Clayton, Georgia, 

 in June 1909. I give below descriptions and figures of these speci- 

 mens, which he generously presented to me. In 1918 Luederwaldt 

 described and figured the female of E. (L.) praedator F. Smith from Sao 

 Paulo, Brazil. It measured 33 mm. (head, thorax and petiole 7 mm., 

 gaster 26 mm.). The female of E. burchclli, captured during the past 

 summer, completes the list of known female Ecitons. 



