374 Bulletin American Museum of Natural History. [Vol. XXI, 



4. The meadow, or pratincolous fauna, comprising the following 

 forms, which inhabit low grassy meadows or bogs: 



Sysphincta melina, Cremasiogaster pilosa, 



Sysphincta pergandei, Myrmica brevinodis. 



5. The heath, or ericeticolous fauna, includes the ants that in- 

 habit rather poor, sandy, or gravelly soil exposed to the sun and 

 covered with a sparse growth of weeds or grasses. To this fauna 

 belong the following: 



Pheidole pilifera, Myrmica sabuleti, 



Pheidole vinelandica, Prenolepis parvula. 



6. The sand, or arenicolous fauna, comprising the following ants, 

 which prefer to nest in pure sand: 



Monomorium minimum, Dolichoderus maricB, 



Pheidole morrisi, Dolichoderus gagates, 



Pheidole davisi, Tapinoma pruinosum, 



Aphcenogaster treatce, Dorymyrmex pyramicus, 



Myrmica pinetorum, Prenolepis testacea, 



Pogonomyrmex badius, Prenolepis arenivaga, 



Leptothorax davisi, Formica pallide-fulva. 

 Trachymyrmex septentrionalis, 



A few of our species, like Lasius americanus and Formica sub- 

 sericea, are so adaptable that they occur more or less abundantly in 

 all or nearly all of the above stations. Owing to intergradation of 

 these stations in some places, we, of course, have a corresponding 

 mingling of faunas. Thus certain species, like Monomorium mini- 

 mum, seem to belong indifferently either to the heath or sand fauna. 

 In the deserts of the Southwestern States these two faunas may 

 either mingle or be sharply separated from each other. In the North- 

 eastern and Middle States a similar relation obtains between the 

 glade and field faunas which it is often impossible to separate by a 

 hard and fast line. Formica schaufussi, for example, seems to occur 

 indifferently in either station. 



Family FORMICID^. 



Subfamily Pgnerin^e. 



Stigmatomma Roger. 



I. S. pallipes Haldeman. — Gloucester (Fox); Westville (Fox); 

 Lakehurst (Wheeler) ; Palisades near Fort Lee (Wheeler) . 



This singular and primitive ant is subterranean and occurs only 



