FSYCHE. 



SKETCH OF THE HABITS OF NORTH AMERICAN ANTS— II. 



BY AUGUSTE FOREL, CHIGNY PRES MORGES, SWITZERLAND. 



Translated by A. F. Morse. 



Appendix to the preceding letter 

 {unpublished) . 



After sending this account to your 

 Society I made a visit to Mr. Pergande 

 and compared in part my gatherings 

 with his collection. The Eciton is E. 

 earolinense Emery. 



I forgot to say that the E. earolinense 

 had only larvae and worker pupae in the 

 nest. I could find the larvae of neither 

 males nor females, which is much to be 

 regretted. 



The conclusion of my journey present- 

 ed still other interesting facts, which 

 follow : 



Arrived at Washington, on the way 

 from Faisons, I was received in most 

 welcome fashion by my estimable col- 

 league Mr. Pergande, entomologist of 

 the Dept. of Agriculture of the U. S. 

 Mr. Pergande aided me in finding num- 

 erous species of ants whose dwellings he 

 knew and his beautiful collection afford- 

 ed an opportunity to make instructive 

 comparisons. 



A small Formica found near Mr. 

 Tyson's in a very small nest of woody 

 materials, like a miniature of F. Integra 

 and its nest, is F. difficilis Emery. I 

 took its curious yellow female also. It 



has exactly the appearance of Integra 

 and pratensis. 



I discovered also the beginning of a 

 formicary of Camponotus marginatus 

 Latr., that is to say the female alone 

 with some cocoons. 



Then Mr. Pergande showed me in the 

 earth the nests of a black Monomorium 

 different from ebeninutn (carbonarium 

 var. ? ; minutum according to Emery), 

 with the metanotum rounded. I have 

 found it since then frequently, nesting 

 in the ground, while ebeninum seems to 

 nest regularly in dead wood and hollow 

 stems. 



A nest of Formica ohscuri^'cntris Mayr 

 was constructed like those of Integra, 

 but I saw no roads. 



In hunting under logs along the Poto- 

 mac we found Stenamma diecki, Strumi- 

 genys clypeata, Proceratium crassicorne, 

 and other rarities of secluded habits. 

 Even in the streets of Washington two 

 formicaries of large Tetrarnorium caespi- 

 tosum L. waged deadly war against each 

 other on the sidewalks, a habit of these 

 ants as McCook and I have already de- 

 scribed. 



At Cromwell, Ct., where I stopped 

 afterward, I found some colonies of 

 Formica, exsectoides with more woody 



