HYMENOPTERA. 69 



rufo- testaceous. Abdomen subglobose and delicately rugose, 

 the extreme apex rufo-testaceous. 



Hob. Celebes. 



39. POLYRHACHIS VIGILANS. PI. IV. fig. 39. B.M. 



Female. Length 4J lines. Black : densely clothed with fine, 

 short, silky, golden pubescence. Thorax : a short acute spine at 

 each of the anterior angles ; the posterior margin of the pro- 

 thorax curved, the metathorax truncate ; the legs with a thin 

 silky pile, and sprinkled with long pale hairs. Abdomen sub- 

 globose ; the scale incrassate, broad at the base and acute at its 

 superior margin, which is widely emarginate above, the angles 

 of the emargination acute, and a short tooth at the sides. 



Hab. Hong Kong. 



40. POLYRHACHIS TYRANNICUS. PI. IV. fig. 29. B.M. 



Worker. Length 3 lines. Black : covered with a thin, silky, 

 pale golden pile ; the thorax flattened above and gradually arched 

 to the apex of the metathorax, the lateral margins sharp and 

 slightly recurved, the anterior angles armed with a stout acute 

 tooth ; the scale of the abdomen incrassate at the base, narrowed 

 to the superior margin, which is transverse, and has an acute 

 spine at each lateral angle, and a shorter acute one beneath at 

 the side. Abdomen subglobose, the insect sprinkled with a few 

 erect, pale hairs. 



Hab. China. 



This species may probably be the worker of P. vigilans, but 

 the armature of the scale is too widely different to justify their 

 being united. 



41. POLYRHACHIS PHILIPPINENSIS. PI. IV. fig. 34. B.M. 



Worker. Length 5 lines. Head and thorax opake-black; 

 abdomen shining black. Antennae elongate, as long as the body ; 

 head narrowed behind, eyes ovate and prominent, head before 

 the eyes oblong-quadrate, with the clypeus rounded in front; 

 palpi elongate, pale ferruginous. Thorax elongate ; the pro-, 

 meso- and metathorax divided by distinct sutures ; the thorax 

 flat above, the margins slightly raised, forming a sharp edge ; 

 the prothorax armed with two long, acute, stout, and slightly 

 divergent spines ; legs elongate, almost destitute of pubescence, 

 having only a few short hairs on the tibiae and tarsi. Abdomen 

 nearly globular ; scale of the peduncle incrassate ; viewed in 



