1906.] Wheeler, The Ants of Japan. 309 



Frontal area depressed, triangular, not fused with the clypeus. Antennae very 

 slender, scapes, when turned directly back, extending about ^ their length 

 beyond the head; all the funicular joints longer than broad; three terminal 

 joints subequal, very long and slender. Thorax resembling that of the soldier, 

 biit with rounder and more sloping humeri and no transverse depression on the 

 posterior portion of the pronotum. Mesonotal depression deep and rounded 

 at the bottom. Basal epinotal surface convex, especially in front; spines short, 

 hardly longer than broad at their bases. Petiole like that of the soldier but 

 with a inore conical node; postpetiole three times as broad as the petiole, slightly 

 longer than broad, convex above, pyriform, broader behind than in front. 

 Gaster about the size of the head, with a rather straight anterior border. Legs 

 slender. 



Smooth and shining; cheeks and front with a few longitudinal rugae. Meso- 

 and metapleiiras reticulate-rugose, subopacjue. 



Hairs white or pale yellow, erect or suberect, sparse on the body, more 

 abundant on the legs and antennas. 



Brownish yellow, head and gaster somewhat darker; teeth of mandibles 

 black. 



Female (dealated). Length 5.5-6 mm. 



Head resembling that of the soldier. Thorax somewhat narrower than 

 the head, longer than broad, with very flat mesonotum and scutellum. Epinotal 

 spines robust, blunt, longer than broad at their bases, more than twice as far 

 apart ar. long, directed backward and outward and very slightly upward. Petiole 

 from above similar to that of the soldier, broader in front than behind, with 

 sharp anterior corners and straight sides; node much compressed antero- 

 posteriorly so that its summit is a sharp blade, deeply notched in the middle. 

 In profile the anterior slope is long and straight, the posterior short and abrupt. 

 Below, the petiole is produced in the middle into a compressed keel, gradually in- 

 creasing in height posteriorly. Postpetiole about 2^ times as broad as the 

 petiole, straight and broadest iti front, semicircular behind, so that its sides 

 appear to be produced anteriorly as bkmt or somewhat truncated projections. 

 In profile the node is high and evenly rounded. Gaster broad and flat. 



The sculpture of the head is like that of the soldier. Pro- and mesonotum, 

 paraptera, scutellum and sides of thorax with regular longitudinal rugas; base 

 of scutellum smooth and shining; petiole and epinotal declivity shining and 

 obscurely pimctate-rugulose. Postpetiole subopaque, node transversely rugose. 

 Gaster shining except the basal half of the first segment, which is opaque and 

 covered with regular longitudinal striae. 



Pilosity like that of the soldier. 



Deep reddish brown; legs, antennal funiculi and epinotal declivity more 

 yellowish. 



Described from several females, soldiers and workers taken by Mr. 

 Hans Sauter from colonies nesting under stones near Okayama, Bizen. 

 The types from Hiogo were very inadequately described by Smith, 

 According to Forel, who received soldiers and workers from Osaka, 

 this species is very closely related to the Indian Ph. rhombinoda Mayr, 



