1906.] Wheeler, The Ants of Japan. 303 



Messor aciculatiis, Iridomyrmex itoi, 



Leptothorax congruus, Iridomyrmex abbotti, 



Leptothorax spinosior, Technomyrmex gibbosiis, 



Pristomyrmex japonicus, Prenolepis flavipes, 



Monoinorium nipponense, Formica yessensis, 



Monomorium triviale, Formica fusciceps, 



Cremastogaster laboriosa, Formica nipponensis, 



Cremastogaster osakensis, Camponotiis obscuripes, 



Stenamma owstoni, Camponotus vitiosus, 



Vollenhovia emeryi, Camponotus 4-notatus, 



Aphcenogaster famelica, Camponotus brunni. 



Perhaps the most interesting of the new forms described in the 

 following pages are Sysphincta watasei, Myrmecina nipponica, Sten- 

 amma owstoni, and Vollenhovia emeryi. These forms, with the ex- 

 ception of the last, have decidedly palearctic and nearctic affinities. 



In working over the materials for the following revision of the 

 Japanese ants I have been greatly aided by Professor Emery, who 

 has taken the trouble to compare several of my specimens with the 

 types of allied species in his extensive collection and has generously 

 given me his expert opinion on the status of some of the new forms. 



Family FORMICID.^. 



Subfamily Ponerin.^. 



I. Sysphincta watasei, sp. nov. 



Worker (Plate XLI, Fig. 5). Length 4 mm. 



Mandibles with oblique blades, 5-6-toothed; the three basal teeth blunt. 

 Head, excluding the mandibles, longer than broad, with roimded posterior angles. 

 Cheek with a short carina anteriorly. Eyes very small, near the middle of the 

 lateral surface. Clypeus very short, its compressed middle portion projecting 

 in front as a prominent bkmt tooth between the high and approximated 

 frontal carinae. Antennal scapes thickened towards their tips and somewhat 

 curved, reaching to the posterior comers of the head; joints i- 10 of the funiculus 

 about as long as broad, terminal joint barely as long as the three preceding 

 joints together. Thorax in profile convex in front, flattened behind, laterally 

 compressed, much broader in front than behind. Epinotum with two indistinct 

 teeth above, connected by a transverse ridge and each continued down on the 

 side as a ridge bordering the concave epinotal declivity. Petiole from above 

 longer than broad, broader behind than in front; in profile with a convex 

 rounded node above, and below near its middle with a sharp tooth. Post- 

 petiole campanulate, twice as broad as the petiole, not longer than broad ; 

 in profile flattened above, especially in front. First gastric segment somewhat 

 broader and twice as long as the postpetiole, convex above; remaining gastric 



