1911] Yano — A New Slave-Making Ant from Japan 111 



eyes prominent. Thorax a little narrower than the head; prono- 

 tum rounded above and in front; mesonotum longer than broad, 

 flat above; pro-mesonotal suture distinct, with a lateral distinct 

 suture between the mesonotum and mesopleurae; meso-metanotal 

 depression very wide; epinotum a little narrower than the prono- 

 tum, much produced, rather sharply rectangular between the basal 

 portion and declivity, the basal portion as long as the declivity, 

 the former slightly convex, the latter feebly concave. Node of 

 petiole very thick, distinctly narrower than the epinotum, the 

 upper surface rounded and broad, anterior slope very convex, 

 posterior slope flat and convex below, gaster short, from above 

 subspherical. 



Body finely punctured and opaque above; under surface of the 

 body, legs, mandibles, and tip of gaster somewhat shining. 



Hairs brownish, sparse, bristly and erect, scattered on the 

 clypeus, dorsum of pronotum and metanotum, upper edge of the 

 node of petiole and gaster; mandibles with fine and short hairs; 

 grayish pubescence very fine, dense on the upper half of the bodj^ 

 including antennae and legs. 



Brownish black to deep reddish brown; antennae and legs some- 

 what paler. 



Female (dealated). Length 7.5 mm. 



Resembling the worker and female of the typical form. Meso- 

 notum flat above; epinotum more gibbous, the basal portion shorter 

 than the declivity. Body black; mouth parts, antennas and legs 

 chestnut brown, and the flagellum and tarsus paler. Bristly hairs 

 scanty; golden pubescence very dense on upper surface of thorax 

 and abdomen, obscure on the head and legs. 



Habitat. Prov. Hyuga (M. Yano); Prov. Buzen (M. Yano.); 

 Tokyo (M. Oguma and M. Yano). 



This subspecies differs from the typical rufescens in its darker 

 color, more opaque surface, shorter pubescence, and in the shape 

 of the epinotum which is more angular than in the European and 

 North American forms of rufescens. 



This ant is a rather common species near Tokyo and in Kiiiiu, 

 and probably throughout middle Japan. It inhabits nests in the 

 earth in the most exposed situations and even in dry fields. The 

 slaves of this ant are Formica fusca fiisca var. japonica Mots- 

 chulsky ( =F. fiisca nipponensis Forel), a common species in my 



