1906.] Wheeler, The Ants of Japan. 311 



evenl}'' rounded. Postpetiole no broader than the petiole; globular, but little 

 broader than long; in profile lower than the petiole. Gaster flattened, some- 

 what larger than the head. 



Body smooth and shining throughout. 



Hairs yellow, very sparse, erect on the upper surface of the body, delicate 

 and appressed on the antennas and legs. 



Pale yellow; gaster black with a small yellow spot, the size of the postpetiole, 

 at its extreme base. 



Described from seven workers taken by Mr. Hans Sauter at 

 Kanagawa near Yokohama. M. nipponense is allied to M. destructor 

 but differs in its smaller size, much more compact antennae, shorter 

 and stouter pedicel, proportionally smaller head, etc. 



12. Monomorium triviale sp. nov. 



Worker. Length 1.3 -1.5 mm. 



Head nearly i\ times as long as broad, rectangular; occipital border 

 feebly excised. Clypeus broadly rounded in front Eyes in front of the 

 middle of the head. Antennae 12-jointed; tip of scape reaching about half- 

 way between the eye and the posterior corner of the head; joints 2-S of the 

 funiculus narrower than the elongated first joint, much broader than long; 

 two basal joints of club subequal, much narrower than the terminal joint and 

 together hardly half as long. Thorax rather slender, anteriorly about half as 

 broad as the head; mesoepinotal constriction distinct but shallow; epinotum 

 small, rounded, without any angle between the basal and declivous surfaces. 

 Petiole hardly half as broad as the epinotum, nearly twice as long as broad, 

 distinctly pedunculate in front; node in profile high with longer concave 

 anterior and shorter convex posterior slopes. Postpetiole hardly broader 

 than the petiole, a little broader than long, in profile much smaller and lower 

 than the petiole, evenly rovinded above. Gaster somewhat smaller than the 

 head. Legs slender. 



Surface of body smooth and shining throughout. 



Hairs yellow, sparse and erect on the head, thorax and abdomen; shorter 

 and more appressed on the appendages. 



Pale yellow throughout; mandibular teeth brownish. 



Described from seven workers taken by Mr. Hans Sauter at 

 Kanagawa on a "heath on the margin of a pond. " 



At first sight this species appears to agree with the Indian M. 

 atomus Forel, with which I at first identified it, but Prof. Emery, 

 who has compared some of my specimens with one of Forel's types, 

 writes me that the Japanese insect is smaller, has a narrower head, 

 and shorter antennae-, the scape not reaching so far back and the 

 funiculus being more slender than in atomus. 



