112 HYMENOPTERA 



Worker. Eatlier smaller than the female and of a brighter red, 

 but closely resembling that sex ; thorax elongate,, attenuated at the 

 base of the metathorax, which is as long as the pro- and mesothorax, 

 entirely smooth and shining; the node of the abdomen as in the 

 female ; the claws of the tarsi simple in both sexes. 



Tairua, near Mercury Bay. 



I find that type specimens of P. castanea (Smith) agree with 

 Mayr's description in the Voyage of the " Novara.^^ 



Geniis-AMBLYOPONE. 



Erichson. 



Female. Head subquadrate ; antennae twelve-jointed, the scape 

 subclavate ; mandibles straight, toothed in the middle on their inner 

 edge and at their apex ; eyes lateral, round, and of medium size ; 

 minute in the workers ; ocelli three, in a triangle on the vertex, 

 wanting in the workers. Thorax oblong-ovate. Wings : Anterior pair 

 with one marginal and two submarginal cells, the second extending to 

 the apex of the wings. The thorax narrowed posteriorly in the workers. 

 Legs short and stout ; claws of the tarsi simple. Abdomen : the node 

 of the peduncle subquadrate-rotund ; a deep strangulation between the 

 first and second segments. 



Male. Head transverse. Antennae thirteen-jointed ; scape short 

 and conical. 



A. CEPHALOTEs. Smith, Trans. Ent. Soc, 1876, p. 490. 



Worker. Black, with obscure ruf o-piceous tints ; the mandibles, 

 antennae, and legs ferruginous. Head more than twice the width of 

 the prothorax, subquadrate with the posterior angles rounded, the 

 anterior margin narrowly obscurely ruf o-piceous ; a deep central chan- 

 nel anteriorly, extending from the insertion of the antennae to the 

 middle of the head ; longitudinally striated, excepting the central and 

 posterior areas, which are somewhat distantly punctured. Thorax 

 elongate, shining, strangulated in the middle ; the prothorax subglobose, 

 and distantly punctured ; the mesothorax abbreviated ; the metathorax 

 elongate, narrower than the prothorax, the sides nearly parallel, 

 obliquely truncate posteriorly ; shining and distantly punctured. 

 Abdomen smooth and shining ; the first segment, or node, subglobose ; 

 the two following large, the second largest, both very convex and 

 rounded ; the apex of the abdomen ruf o-piceous. 



Length, 4 lines. 



Auckland. 



