BIOLOGICAL PAPERS. 139 



Mynnica. 



AI. scabrinodis sahiilcti ^leinert. This is the commonest species 

 of this genus found here. 



M. scabrinodis schencki Emer}\ Taken near Chicago. 



M. brevinodis canadensis \\'heeler. 



Leptothorax. Two species of this genus are fairly common. 



L. curvispinosus Mayr. 



L. fortinodis mclanoticus Wheeler. 



Both of these species live in such protected situations, as under 

 bark of trees, in stems of weeds, etc. I have found entire colonies 

 of the first species passing the winter on the inside of dried apples 

 which had fallen to the ground and were protected by dead leaves. 



Strumygenys. This genus is rare. I have two specimens taken 

 near Bloomington, 111., by Messrs. W. P. Flint and G. E. Sanders, 

 the species of which I have not yet determined. 



S. clypeata Roger. A number of specimens of this species was 

 found by Mr. James Zetek in a wood near Urbana. 



Trachymyrmex. This is a southern genus, and I have but one 

 vial of it in my collection. 



T. septcntrionalis ^IcCook. This was taken at Elizabethtown, 

 111., by \Y. P. Flint. It is one of the fungus-growing ants. 



Subfamily Dolochoderin^. 



This subfamily is represented by two species belonging to differ- 

 ent genera. 



Tapinoma sessile Say. A small, black ant having the odor of 

 rancid butter. Rather common. 



Iridomynnex analis Andre. I have taken this ant in but one 

 situation, near Urbana. This is the same genus as the introduced 

 ant that is proving to be such a pest at some places in the southern 

 states. 



Subfamily CAMPAxoTix.i:. 



While this subfamily is represented in the collections by fewer 

 genera than the Myrmicincr, it contains our three most dominant 

 genera, Lasiits, Formica and Campanotns. 



Brachymyrmex heeri subsp. depilis 'Emery. 



Prenolepis imparis Say. 



P. imparis testacea Emery. 



Lasius. 



L. nigcr americanus, the small, brown, corn-field ant, the most 

 common of all our ants. 



