A KEY TO THE SPECIES OF WISCONSIN ANTS, WITH 

 NOTES ON THEIR HABITS. 



A. C. BURRILL AND M. R. SmITH. 



The writers are particulariy indebted to Dr. W. M. Wheeler, 

 of Harvard University, for the identifications of a number of 

 the species here given and for the frequent references to his 

 notes. 



We are also highly indebted to the gentlemen, whose names 

 are mentioned below, for acknowledged assistance given in 

 the preparation of this paper. 



Mr. C. E. Brown, Curator of the Museum of the University 

 of Wisconsin, for a list of his collections in the State of Wisconsin 

 and for notes in connection therewith. 



Mr. T. E. B. Pope, Curator of the Milwaukee City Museum 

 for furnishing the authors with a list of the Wisconsin species 

 in the Museum. 



Mr. F. H. Gaige, Curator of the University of Michigan 

 Museum, for furnishing the writers with several species for 

 study. 



Mr. H. F. Wilson, Entomologist of the University of Wis- 

 consin, for the identifications of aphids, which were being 

 attended by the ants. 



Mr. H. S. Barber, U. S. Bureau of Entomology, for the 

 identification of Coleopterous larvae. 



Subfamily Formicid^. 



1. Abdominal pedicel consisting of a single segment 2. 



Abdominal pedicel consisting of two segments 3. 



2. Cloacal orifice terminal, surrounded by a fringe of hairs CamponolincB. 



Cloacal orifice ventral 4. 



3. Frontal carinas very close together, almost vertical, not covering antennal 



insertions; eyes small or absent Dorylina. 



Frontal carinas not as above; eyes rarely vestigial or absent MyrmicincB. 



4. No constrictions between the first and second gastric segments; anal glands 



present, which produce a secretion with a rancid butterlike odor. . . . 



Dolichoderince. 



Gaster with a distinct constriction between the first and second segments; 

 frontal carinas separated or close together Ponerincs. 



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