158 SUPPLEMENT TO 



those of the preceding work may be regarded as so 

 man}^ drawers in onr Cabinet of Habits, and though, 

 as we open drawer after drawer, many gaps and 

 blank spaces remind us how much remains to be 

 done in order to complete the collection, 3^et the 

 interest and suggestiveness of the specimen-facts al- 

 ready secured, should encourage and direct us on- 

 w^ards. There have not been wanting instances in 

 which my readers have associated themselves with 

 me in the way indicated, and it is with pleasure, 

 when reviewing the entire work, that I recall how 

 many of its m.ost interesting features are due to the 

 i^esearches and assistance of friends,* and commemo- 

 rate at once their discoveries and unfailing kindness. 

 I had certainly expected that before this time some 

 new species of harvesting ants would have been dis- 

 covered, either on the Eiviera, where attention has 

 been especially called to the subject, or in other parts 

 of Europe, where dissimilar conditions might have 

 been expected to be associated with a different fauna j 

 but this has hitherto not been the case. 



One might naturally suppose that if harvesting ants 

 were discovered in localities very widely distant from 

 each other, they would prove to belong to different 

 species, but thus far, both in Europe and Northern 

 Africa, it is the same two well-known species of Atta 

 barbara and A. sfrucfor that constantly reappear. 



For instance, I have recently learned that harvest- 

 in c ants are found at Cadenabbia on the lake of 



* To all who have rendered me this valuable help I tender my cordial 

 thanks. L am under very special obligations to Mr. Pickard-Cambridge, 

 for descriptions of spiders, and to Mr. F. Smith for the names of the Ants; 

 assistance which I should have found it almost impossible to dispense with or 

 to replace. 



