138 hymenoptera. 



10. Crematogaster BRUNNEUS. 



Worker. Length 2 lines. — Reddish-brown, smooth and 

 shining : head wi(ler than the thorax, the vertex slightly emar- 

 ginate. Thorax : the disk concave and finely striated longitudi- 

 nally ; the metathorax deeply concave, and furnished on each side 

 with a stout acute spine ; the legs with the tips of the joints and 

 the tarsi pale testaceous. Abdomen heart-shaped, smooth and 

 shining ; the first node of the peduncle heart-shaped, flattened 

 above, the second globose and bituberculate above. 



Worker minor. — One-third smaller, and of a paler colour. 



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



11. Crematogaster ARBOREUS. Tl.XIY. Nest. B.M. 



Worker. Length 2 lines. — Pale ferruginous, with ver}' thinly 

 scattered short glittering hairs : the head subovate, slightly 

 emarginate behind, delicately striated longitudinally, the mandi- 

 bles mth four strong acute teeth ; the antennae, tarsi, and apex 

 of the abdomen more or less fuscous. Thorax flattened on the 

 disk, deej)ly strangulated between the meso- and metathorax, 

 with the latter armed with two acute spines. Abdomen : the 

 first node of the peduncle, viewed in front, pear-shaped, with the 

 broad end downwards ; the second node ovate, with a deeply 

 impressed line above. 



Hab. Port Natal. 



The nest of this species, of which a figure is given, was sent to 

 England by Herr Gueinzius from Port Natal : a number of spe- 

 cimens of the insect were found in the crevices and entrances to 

 the nest ; many individuals are of a paler colour than the one de- 

 scribed, but all are of the same size, sex, and form. 



12. Crematogaster l^viceps. B.M. 



Worker. Length 2 lines. — Obscure fusco-ferruginous, the an- 

 tenna; and legs rather paler than the head and thorax : abdomen 

 very dark, nearly black. The head and the mesothorax smooth 

 and shining, the metathorax with a few delicate striae at its base, 

 its apex armed on each side with a stout acute spine ; a deep 

 strangulation between the meso- and metathorax. The first node 

 of the peduncle, viewed in front, is broad and rounded at the 

 base, narrowed upwards, its apex obtuse ; the second node sub- 

 globose, with a deep longitudinal impression above ; a few pale 

 hairs scattered over the abdomen; the head, thorax, and base of 

 the abdomen, pale rufo-testaceous beneath. 



Hab. Australia (Melbourne). 



