COLLECTED AT CELEBES. 71 



the thorax flat above, the lateral margins being slightly notched at 

 the divisions between the pro-, meso- and metathorax ; otherwise hke 

 the female. 

 Hab. Makassar. 



5. PoLYRHACHis NUDATUS. P. capite thoraceque opacis; abdomine 

 nitido, laevissimo ; thorace spiuis duabus longis acutis antice et pos- 

 tice armato ; squama spinis duabus longis curvatis. 



Worker. Length 4 lines. Black ; the head finely rugose ; the mandi- 

 bles stout and shining ; the palpi fuscous. Thorax oblong, with two 

 very stout conical spines in front, which curve obliquely outwards ; the 

 metathorax has also two similar spines, but rather longer, which diverge 

 and are bent slightly downwards; the thorax rounded above; the 

 legs shining black. The peduncle of the abdomen incrassate, quadrate, 

 and armed above with two stout, long, curved, acute spines, which are 

 directed backwards, and curve to the shape of the base of the abdomen. 



Hab. Makassar. 



6. PoLYRHACHis PEREGRiNUS. P. nigcr, pallidc aureo-sericeo ves- 

 titus ; thorace spinis acutis antice et postice armato ; abdominis squa- 

 mula spinis duabus longis acutis ad basin minute unispinulosis instructa. 



Female. Length 4 lines. Black, and clothed with pale golden silky 

 pubescence ; anterior margin of the clj'^peus rounded ; mandibles 

 shining black ; the palpi pale testaceous. Thorax : the prothorax 

 with two acute spines in front, which are directed outwards; the 

 metathorax has two longer spines, also pointing obliquely outwards. 

 Abdomen ovate; the peduncle armed with two long, stout, slightly 

 curved spines, which have at their base, within, a minute acute spine. 



Hab. Makassar. 



This species is easily distinguished by the minute spines within the long 

 lateral ones. 



7. PoLYRHACHis VESTiTUS. P. nlgcr, aurco-scriceo vcstitus J thorace 

 spinis duabus acutis antice armato ; squama integra. 



Worker. Length 6 lines. Black, and clothed with a pale golden seri- 

 ceous pile ; the legs naked ; the mandibles stout, finely striated, the 

 striae interspersed with punctures ; the front of the head very promi- 

 nent. Thorax flattened above, the margins acute and slightly raised ; 

 the pro-, meso- and metathorax separated by strongly marked sutures ; 

 the prothorax armed at its anterior angles with a stout acute spine, 

 which is compressed and broad at its base. Abdomen : the peduncle 

 unarmed, its margin rounded. 



Hab. Makassar. 



This species is nearly three times the size of P. inermis, which it resem- 

 bles in form, but is covered with silvery pile. 



8. PoLYRHACHis s^vissiMus. P. uigcr, tibiis ferrugineis; thorace 

 spinis duabus acutis antice et postice armato ; squama subquadrata, 

 spinis duabus longis curvatis ; abdomine laevigato, nitido. 



