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Soldier major: Length 6-11 mm. Head yellowish red, brownish 

 anteriorly. Body yellowish. Pubescence very sparse. Head elongate, 

 cylindrical, much longer than broad. Length 2.1-2.9 mm. width 1.3-1.9 mm. 

 Front in the middle with an incision, two-lobed; side knob rounded. 

 Compound eyes distinct, with no pigment. Ocelli rudiment. Basal portion 

 of the clypeus very short, labrum reached to one-third of the mandible, 

 relatively long, very robust. Antennae very short, 12-13-jointed, 2nd joint 

 hardly longer than broad, somewhat longer than 3rd, and as long as 4th. 

 Pronotum as broad as in the head, or somewhat narrower. The anterior 

 margin concave with strongly rounded borders, and posterior margin 

 arched. Meso- and metanotum with short rudimentary wing sheath. 

 Legs short. 



Soldier minor: Length 5-5.5 liim. Head brownish yellow, darker 

 anteriorly ; pronotum pale yellow ; other parts of the body yellowish white. 

 Head ovate; length 1.5-1.8 mm. Width 1.1 mm. Antennse 11-jointed. 

 Pronotum narrower than head. 



Nymph: Length 6-7.5 mm. Antennse 13-15-jointed, milky white. 

 Compound eye brownish. Wing sheath with yellow tint longitudinally. 



2. Life History. 



The species living on rotten twigs and branches of trees in the 

 woods, makes but a small family of about 100 individuals. The queen has 

 only peculiarly swollen abdomen, the winged ants take their fight on July. 



3. Distribution. 



Locality of distribution of the species is limited where mean tem- 

 perature is above 16° C. a year, and is found in the southern part of Kiushu 

 (Kagoshima and Miyazaki Prefectures) as well as whole of Formosa. 



