HYMENOPTERA. 137 



the middle at the sides of the head. Thorax : the anterior mar- 

 gin rounded, the posterior portion forming a semi-transparent 

 bladder-Uke sweUing, with a deep longitudinal depression in the 

 middle; the inflated part not quite so wide as the head; the 

 apical joints of the tarsi rufo-testaceous. Abdomen heart- 

 shaped ; the peduncle, base and apical margin of the first seg- 

 ment obscurely rufo-piceous. 



Hab. Singapore; Borneo (Sarawak). 



7. Crematogaster difformis. B.M. 



Worker. Length 2^ lines. — Black : the head twice as wide as 

 the thorax ; the tips of the mandibles and the'apical joints of the 

 flagellum dark ferruginous ; the head smooth and shining ; the 

 eyes small, placed about the middle at the sides of the head. 

 Thorax : the anterior margin rounded, the metathorax greatly 

 dilated, with a deep excavation behind ; the legs stout, with their 

 articulations and the tarsi ferruginous. Abdomen heart-shaped, 

 with the base, in some examples, slightly ferruginous. 



Worker minor only differs in being one-thu-d smaller. 



Hab. Borneo (Sarawak); Singapore. 



8. Crematogaster obscurus. 



Worker, Length 1} line. — Dull testaceous, smooth and 

 shining : the base of the scape and of the flagellum, as well as 

 the clypeus and mandibles, pale testaceous ; the head smooth and 

 shining. Thorax rounded in front, and having a central longitu- 

 dinal channel, deeply strangulated in the middle ; the metathorax 

 subquadrate, with short spines at the posterior angles ; the tips 

 of the joints of the legs and the tarsi pale testaceous. Abdo- 

 men heart-shaped. 



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



9. Crematogaster cephalotes. 



Worker. Length 1-1 1 hue. — Testaceous : head very large, 

 smooth and shining; the antenn?e, clypeus and mandibles pale 

 testaceous. Thorax deeply constricted in the middle, rugose 

 in front, with a smooth shining space before the constriction ; 

 the metathorax deeply excavated, having on each side an acute 

 spine ; the tibiae and tarsi pale testaceous. Abdomen heart- 

 shaped ; the basal node flattened anteriorly, with the sides angu- 

 lated, the second node globose. 



Worker minor. — Differs in having the head proportionabh 

 smaller, the thorax being smooth and shining above. 



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



