OP NEW ZEALAND. 113 



Sub-Family — MTRMiciNiE. 

 Maxillary palpi one- to six-jointed; labial palpi two- to four-jointed. 

 Ocelli obsolete in the workers. Females and workers armed with 

 stings. Petiole of the abdomen with two nodes. Pupas usually 

 naked, not enclosed in cocoons, but casting off: a thin pellicle on 

 arriving at the imago state. 

 Thorax unarmed. 



Naked. Maxillary palpi four-jointed. Tetramorium. 

 Hairy. Maxillary palpi two-jointed. Monomorium. 

 Thorax armed with teeth. Orectognathus. 



Genus-TETRAMOEIUM. 



Mayr. 

 Maxillary palpi four- jointed ; labial palpi three-jointed. Antennae 

 clavate, the club three-jointed. 



T. STRIATUM. Smith, Trans. Ent. Soc, 1876,^0. 481. 



Female. Black ; head nearly as wide as the thorax, and longi- 

 tudinally striated ; the mandibles bidentate, and, as well as the apex 

 of the apical joint of the antennae, ferruginous ; the extreme apex of 

 the scape, and also the base of the flagellum, usually more or less fer- 

 ruginous. Thorax : longitudinally striated, the base of the metathorax 

 finely transversely so ; the metathorax bidentate, with a deep smooth 

 sulcation between ; the trochanters, tips of the femora, and the tarsi 

 rufo-piceous. Abdomen smooth and shining, and having a few scat- 

 tered pale-fulvous hairs ; the nodes of the petiole striated. The 

 wings sub-hyaline, the nervures fusco-ferruginous. The thorax oblong- 

 ovate. Length, 4 lines. 



Worker. Black ; sometimes more or less obscurely rufo-piceous ; 

 the head smooth and shining ; the mandibles and front ferruginous, 

 varying much in the depth of colouring; the apical joint of the 

 antennse more or less rufo-piceous. Thorax oblong, strangulated in 

 the middle ; the prothorax rounded in front, slightly transversely 

 striated above, as well as the metathorax, which is bidentate ; the 

 legs more or less brightly fusco-ferruginous. Abdomen smooth and 

 shining, ovate, and with a few scattered pale hairs. Length, 2'i lines. 



Male. Black, and shining ; the head pubescent, transverse, 

 longitudinally striated, with the eyes prominent. The mesothorax 

 and scutellum longitudinally striated, the former smooth and shining 

 anteriorly ; the metathorax shining, and longitudinally sulcate ; 

 the wings sub-hyaline, the nervures testaceous. Abdomen : the 

 first node of the petiole clavate and slightly striated ; the second also 



