June, igog.] WhEELER : NORTH AMERICAN FORMICID.C 77 



= Anisops platycneviis Uhler, 18S2, Stand. Nat. Hist., II, 250 ; 

 Bueno, 1902, Journ. N. Y. Ent. Soc, X, 236 ; 1904, Kirkaldy, 

 Wien. Ent. Zeit., XXIII, VII, 123; and very many other authors 

 (but not Fieber). 



The three descriptions cited above will enable anyone to identity 

 this species with certainty. 



The three species oi Biienoa thus far found in the eastern United 

 States are, therefore : B. margaritacea Bueno, B. platycnemis Fieber, 

 B. elegafis Fieber, and they may be separated by the following table : 



1. (2) Large species, over 6 mm. long I. margarziacea Bneno. 



2. (l) Smaller species, less than 6 ram. long. 



3. (4) Eyes large and prominent ; shape slender 1. platyciie)nisY\€Qt.x. 



4. (3) Eyes large but not prominent ; shape more convex 3. elegans Fieber. 



Buenoa margaritacea appears to be very widely distributed in the 

 north and I should not be surprised if it occurred in Canada, as in 

 the United States, as far to the west as the longitude of Illinois, at 

 least. Beyond that, other (and undescribed) forms are apt to occur. 

 As to B. phitycyjiemis and B. elegans, the latter I have seen only from 

 New Jersey, but the former is found as far to the south as Washington, 

 D. C, and west to Illinois. 



In the south and west there are a number of forms very close to 

 Buenoa 7nargaritacea and naturally, some representatives of the Mexi- 

 can fauna will be found in the border states, but as matters stand to- 

 day, it would be hard work for anyone to pronounce positively on any 

 of these forms in the absence of some definite work on the genus as a 

 whole. A monographic revision of the genus therefore becomes im- 

 perative if we would have some fixed foundation on which to base our 

 studies. 



y 



A DECADE OF NORTH AMERICAN FORMICID^.* 



Bv William Morton Wheeler, 

 Boston, Mass. 



I. Myrmica bradleyi, new species. 



Worker. — Length 4-7 mm. 



Allied to M. rubida Latreille and M. miitica Emery. Head rectangular, as 

 broad as long, with subparallel sides and straight posterior border. Mandibles 

 moderately convex, pointed, with minutely denticulate blades. Clypeus somewhat 



* Contributions from the Entomological Laboratory of the Bussey Institution, 

 Harvard University, No. 2. 



