148 SMITH ON HIMENOPTEEA OP AHU ISLANDS. 



3. Myrmica thoracica. M. capite abdomineqiie nigris; antcnnis, 

 mandibulis thorace pedibusque flavis. 



Worker. Length f line. Head and abdomen jet-black ; the antenna?, 

 thorax, and legs of a clear honey- yellow ; the mandibles of a more 

 obscure yellow; the anterior margin of the thorax transverse, the 

 lateral angles acute, narrowed from thence to the base of the meso- 

 thorax, the disk anteriorly slightly convex; the metathorax armed 

 with two acute spines. Abdomen nearly round, and very smooth and 

 shining ; the first node of the petiole vertical anteriorly, and gradually 

 rounded behind, the second node transverse, its anterior margin 

 straight, the angles rounded, the sides narrowed towards the abdo- 

 men ; the club of the antennae 3-jointed. 

 Hab. Aru. 



The singular form of the thorax of this species, as well as the construc- 

 tion of the nodes of the petiole, appear to indicate an uncharacterized 

 division of the genus Myrmica. 



4. Myrmica suspiciosa. M. rufo-testacea, laevis, tota nitidissima 

 nuda; mandibulis, antennis, pedum articulationibus tarsisque palles- 

 centibus ; metathoracis spinis minutissimis. 



Worker. Length 1 line. Rufo-testaceous and very smooth and shining ; 

 the antennae as long as the insect ; the flagellum, mandibles, tarsi, and 

 articulations of the legs pale testaceous. The thorax narrowed an- 

 teriorly into a short neck, behind which it is dilated, the sides being 

 rounded, the meso- and metathorax narrower and of nearly equal 

 width, the spines of the metathorax minute and slender. The first 

 node of the petiole somewhat wedge-shaped, the second globose, the 

 abdomen very smooth and shining ; club of the antennae 3-jointed. 

 Hab. Aru. 



I can detect no specific diiFerence between this and Myrmica Icevigata, 

 taken by myself in the neighbourhood of London ; but it is not uncom- 

 monly met with in hothouses, near to which I captured my specimen, 

 I believe M. IcBvigata is identical with (Ecophthora pusilla, the House- 

 Ant of Madeira. 



6. Myrmica mellea. M. capite thoraceque flavis; abdomine pallide 

 fusco. 



Worker. Length If line. Head, antennae, thorax, and legs honey- 

 yellow and very smooth and shining ; thorax strangulated at the base 

 of the metathorax, which is not spined ; the first node of the abdo- 

 men is oblique anteriorly, and vertical behind, the second node sub- 

 globose. Abdomen : the base honey-yellow, the apical margin of the 

 first segment, and the following segments entirely, pale fuscous ; the 

 club of the antennae 2-jointed. 



Hab. Aru, 



6, Myrmica carinata, M, obscure fusco-ferruginea ; thorace rufo- 



