588 CONNECTICUT GEOL, AND NAT. HIST. SURVEY. [Bull. 



cool bogs or meadows, and is small and dark colored, with the 

 antennal scape bent at a right angle. 

 Connecticut (Pergande, Emery). 



Leptothorax Mayr. 

 Key to Species. 



1. Thorax faintly but distinctly impressed at mesoepinotal su- 



ture 2 



Thorax not impressed at mesoepinotal suture 3 



2. Post petiole opaque, sculptured acervorum subspecies canadensis 

 Postpetiole smooth emersoni 



3. Color black or dark brown; epinotal spines very long and 



straight longispinosus 



Color yellow ; epinotal spines curved 4 



4. Epinotal spines long and thin (typical) curvispinosus 



Epinotal spines short and nearly straight 



curvispinosus subspecies ambiguus 



L. acervorum subspecies canadensis Provancher. 



A rather rare boreal form nesting in bark in small colonies. 



Colebrook (W. M. W.). 



L. emersoni Wheeler. 



Living only in xenobiosis with colonies of Myrmica brevi- 

 nodis. It obtains its food by licking the surfaces and mouth-parts 

 of the Myrmica workers, and brings up its brood in little cells 

 which communicate by means of slender galleries with the larger 

 chambers and runways of the Myrmica. The males and winged 

 females appear during August. 



Colebrook (W. M. W.). 



L. longispinosus Roger. 



A black species nesting under small stones lying on large 

 boulders, in the clefts of rocks, in hollow nuts lying on the 

 ground, and more rarely under bark. The workers seek their 

 food, which consists of small insects and honey-dew, on the low 

 vegetation in the shade of the trees. 



Colebrook (W. M. W.). 



L. curvispinosus Mayr. 



Nesting in hollow twigs, galls, etc. Easily recognized by its 

 yellow color and the two black or brown spots on the first gastric 

 segment. 



Branford, RockviUe (H. L. V.). 



