HYMENOPTERA. 89 



the thorax beyond much compressed, with a central longitudinal 

 groove above, the sides obliquely striated ; the truncation of the 

 apex oblique and transversely striated. The node of the aodo- 

 men compressed, rounded in front and above, and obliquely 

 grooved ; the margin of the truncation with two acute spines 

 above, directed backwards. The basal segment of the abdomen 

 with curved striae, slightly impressed and obliterated at the sides ; 

 the apical margins of the segments rufo-piceous. 



Hab. Borneo (Sarawak). 



22. PONERA VIDUA. 



Male. Length 4 lines. Red-brown : antennae elongate, fusco- 

 ferruginous, the base and apex of the joints pale testaceous ; eyes 

 large and prominent, the ocelli large and of glassy brightness. 

 Thorax elongate-ovate ; the metathorax truncate, with the sides 

 rugose ; the wings hyaline, the nervures pale yellow, the stigma 

 brown ; legs pale testaceous. Abdomen smooth and shining, 

 with a thin scattered pale pubescence, most dense towards the 

 apex; a deep strangulation between the first and second seg- 

 ments; the node of the peduncle incrassate, coarsely rugose, 

 rounded in front and truncate behind : beneath, furnished with 

 two short teeth. 



Hab. Borneo (Sarawak). (Coll. W. W. Saunders, Esq.) 



23. PONERA DIMINUTA. B.M. 



Worker. Length 3 lines. Black : the mandibles and extreme 

 base of the scape ferruginous, the flagellum fusco-ferruginous ; 

 the head elongate, narrowed behind; delicately striated, the 

 striae curved transversely on the vertex. Thorax elongate, pro- 

 duced anteriorly into a neck, behind which it is swollen : in the 

 middle it is compressed, and from thence widened to the apex ; 

 the apex obliquely truncate, the truncation with a few deep 

 transverse striae; the thorax above has a number of short irre- 

 gular striae or scratches ; the legs rufo-piceous, the tarsi palest. 

 Abdomen : the scale or node, viewed laterally, is quadrate ; above, 

 it is slightly widest behind and truncated in front and behind ; 

 the first segment rounded in front, its apical margin constricted, 

 the second segment is also constricted at the base ; the abdomen 

 is smooth and shining, with tne apical margins of the segments 

 and the apex rufo-piceous. 



Hab. Borneo (Sarawak). 



This species, on a smaller scale, is almost an exact representa- 

 tive of the P. tar sat a. 



