280 The Ohio Journal of Science [Vol. XIX, No. 5, 



Subfamily Camponotin.^. 



1. Antennas with nine joints Brachymyrmex Mayr. 



Antennae with more than nine joints 2. 



2. Workers polymorphic, pronotum flattened Campotiotus Mayr. 



Workers not polymorphic, though of variable size 3. 



3. Large robust ants with three prominent ocellar spots on vertex of the head, 



Formica Linn. 



Smaller, more slender ants with less prominent ocellar spots on vertex of 

 the head . . . . i 4. 



4. Mesonotum sub-cylindrical Prenolepis Mayr. 



Mesonotum not sub-cylindrical 5. 



5. Maxillary palpi six jointed Lasius s. str. Fabr. 



Maxillary palpi- three jointed subgen. Acanthomyops Mayr. 



Genus Brachymyrmex Mayr. 

 B. heeri depilis Emery. 



A small, pale yellowish species with nine jointed antennae. 

 It is the smallest of the Wisconsin ants recorded in this paper. 



The workers build their nests under stones in shady woods 

 and attend root Coccids and Aphids. 



Subfamily Camponotin^. 



Genus Camponotus Mayr. 



1. Clypeus with a notch in the middle of its anterior border 



{fallax and its varieties) 2. 



Clypeus without such a notch 3. 



2. Form slender; head, thorax and abdomen smooth shining black, practically 



devoid of hairs except for the fringe of hairs on the posterior edge of each 

 segment of the abdomen fallax var. nearcticus Emery. 



3. Color black; head and thorax sparsely covered with large yellow hairs; the 



abdomen with numerous large hairs and rather pubescent giving it a bronzed 



appearance herculaneus pennsylvanicus De Geer. 



Color yellow and black or red and black 4. 



4. Yellow or brownish red in color, gaster dark, head much darker than either, 



'. castaneus subsp. americanus Mayr. 



5. Thorax dark red, head and abdomen smooth shining black 



herculaneus ligniperda var. novehoracensis Fitch. 



Thorax black, mottled with red, the latter color being confined to the 

 posterior part of the thorax herculaneus var. whymperi Forel. 



C. herculaneus subsp. pennsylvanicus De Geer. 



This ant is the most widely distributed species of the genus, 

 ranging from southern Canada over the North Atlantic and 

 Middle Western States as far west as Texas and South Dakota ; 

 for this reason it has been more often noticed than the other 

 members of this group. 



Nests are built in logs, stumps or the dead wood of standing 

 trees; occasionally they nest in houses where they may do 

 considerable damage by tunneling in the w^ood. 



