OP HTMENOPTERA FBOM SUMATRA, ETC. 75 



Worker {minor). Length 1 J line. The general colouring the same as in 

 the worker major, but rather paler; and of a very different form : the 

 head of the ordinary size, oblong-ovate, narrowed behind the eyes 

 abruptly towards the prothorax, which forms a neck ; the eyes are 

 prominent, and situated midway at the side of the head (in the 

 worker major they are about one-third from the anterior margin) ; the 

 antennae and legs elongate ; the metathoracic spines very minute. 



Hab. New Guinea. 



Gren. Pheidolacanthinus, Smith. 



Head large in the worker major ; mandibles very stout, their inner edge 

 sl\arp and smooth, not toothed; the antennae 11-jointed, the club 

 consisting of three joints; eyes minute, placed a little beyond the 

 middle at the sides of the head. Thorax oblong, armed on each side 

 in front with a long stout spine, acute at its apex ; the metathorax 

 with two shorter spines. Abdomen ovate ; the peduncle with two 

 nodes. 



The above characters are drawn from a unique example of a 

 worker, and are necessarily incomplete, but, with the aid of a 

 figure of the insect, vsdll serve to discriminate the genus. It is 

 very like a species of Fheidole, but has one joint less in the an- 

 tennae ; and the armed prothorax indicates, I think, more than a 

 specific distinction. The capture of the other sexes will, I expect, 

 justify" its separation as a genus. 



1. Pheidolacanthinus armatus. p. rufo-ferrugineus ; capite 

 maximo, in medio sulcato et striate ; thorace spinis duabus acutis 

 antice et postice armato. 



Worker. Length 2 lines. Bright rufo-ferruginous ; the abdomen very 

 obscurely ferruginous, nearly black. Head very large, deeply striated 

 longitudinally ; the mandibles smooth and shining, their inner edge 

 black and edentate. Thorax armed with two very stout, long spines 

 in front, and two smaller ones on the metathorax ; the femora incrassate 

 in the middle ; the tarsi slender and pale testaceous. Abdomen deli- 

 cately aciculate at the extreme base ; the first node of the peduncle 

 compressed, the second incrassate and transverse. ' (PI. IV. fig. 8, ^ .) 



Hab. Salwatty. 



Gen. SoLEKOPSis, Westw. 



\. SoLENOPSis L.EVIS. S. rufo-testacea, Isevis, tota nitidissima, nuda; 



metathoracis spinis minutissimis. 

 Worker. Length 2^ lines. Rufo-testaceous, smooth, shining, and 



impunctate ; the inner margin of the mandibles with four black teeth; 



the head wider than the abdomen ; the eyes very minute, situated 



midway at the sides of the head. Thorax rounded anteriorly ; the 



