70 ME. smith's descbiptions of htmenoptebous insects 



the prothorax short, stout, and acute ; the mesothorax very convex, 

 with an abbreviated shining carina in the middle anteriorly ; the 

 metathorax transverse, abruptly truncated, sUghtly concave in the 

 middle above ; the legs ferruginous, with their articulations and tarsi 

 fuscous. Abdomen ovate ; the peduncle subtriangular, a stout, short, 

 acute spine at the lateral angles. 

 Worker. Length 4i lines. Only differs in having the thorax flattened 

 above, with the lateral margins slightly raised ; the scape of the an- 

 tennae compressed, as in the female. 



3. PoLYRHACHis RUGiFRONS. P. capitc thoraccquc subopacis; ab- 

 domine sericeo vestito ; thorace spinis duabus longis acutis antice et 

 postice armato, squamis bispiuosis. 



Female. Length 7 lines. Black ; the head oblong, rugose, and nar- 

 rowed behind the eyes ; the palpi pale testaceous. Thorax : the pro- 

 thorax armed on each side with a short, stout, acute spine, directed out- 

 wards ; the mesothorax with a short abbreviated carina in the middle 

 anteriorly, where it is rugose ; the metathorax less rugose and with a 

 fine cinereous pile, at each lateral angle is a short, stout, acute spine, 

 pointed outwards ; the legs slightly pilose. Abdomen covered with 

 a fine, shining, changeable silky pile, which has a faint golden lustre ; 

 the peduncle armed above on each side with a stout, acute, slightly 

 curved spine which is directed outwards. 



Hab. Makassar. 



This species is of the same size as, and closely resembles, P. sex-spinosus, 

 but differs in not having the head armed posteriorly with spines, and 

 also in the length and direction of the spines on the thorax and pe- 

 duncle ; it is also much more strongly sculptured. The worker only 

 differs in having the thorax narrower, the sides being more parallel, 

 but rather wider anteriorly ; the sculpture is the same, as well as the 

 pilosity. 



4. PoLYRHACHis scuLPTURATUs. P. capitc, thoracc abdomineque 

 delicatule aciculatis ; thorace spinis duabus elongatis acutis antice 

 armato ; abdominis squamula spinis duabus longis acutis, utraque 

 ad basin minute unispinulosa. 



Female. Length 4| lines. Black, and very finely striated longitu- 

 dinally ; the eyes as well as the front of the head prominent ; the man- 

 dibles shining and longitudinally striated. Thorax short and very 

 convex above, armed in front with two stout acute spines ; the wings 

 fusco-hyaline, the nervures rufo -testaceous, the stigma black. The 

 peduncle of the abdomen with two stout, upright, acute spines ; at the 

 base of each, outside, is a short minute spine. The entire insect thinly 

 covered with erect black pubescence, which is most dense on the ab- 

 domen ; the abdomen has also a thin covering of shorter pale pu- 

 bescence. 



Worker. Length 4 lines. Closely resembling the female, but with 



