124 



Arthur M. Lea 



fine on elytra, and with the surface elsewhere glabrous or appa- 

 rently so. The first six are from nests of the " green-head " 

 ■stinging ant, and in size and colour are more or less alike. 



The following table, in which, however, three species from the 

 nests of other species of ants are included, may be of use in 

 distinguishing them. 



Upper surface entirely black ------ colohopsis 



Upper surface not entu-ely black. 



Elytra entirely pale ------ pallidominor 



Elytra partly or entirely dark. 



Prothorax decidedly opaque - - - - semiox>aciis 



Prothorax more or less shininnj. 



Sides of prothorax gently rounded 

 towards base. 

 Prothorax of uniform colour - - ectatommae 

 Prothorax paler at sides of base 



than on disc - - - intrepidus 



Sides of prothorax oblique towards base. 



Head opaque - - - . coxi 



Head shining. 



Head pale - - - - infuscaticornis 



Head dark. 



Abdomen entirely pale daveyi 

 Abdomen partly dark - tasmaniensis 



Polylohus coxi, n.sp. (Fig. 28). 



Of a dingy piceous-brown, head almost black ; prothorax of a 

 dingy red ; legs somew^hat flavous. Head opaque, prothorax and 

 elytra feebly shining. 



Head as long as wide, hind angles rather strongly rounded. 

 Eyes small and fairly prominent. Antennae not passing base of 

 prothorax, moderately thickened towards apex, most of the 

 joints strongly transverse. Prothorax feebly transverse, front 

 angles rather strongly rounded, sides feebly but distinctly de- 

 creasing in width, with straight outlines to base, hind angles 

 rectangular, with a small feeble impression in middle of base ; 

 Avith dense minute punctures. Elytra fiat, not much wider 

 than prothorax, and visible portion along middle very little 

 longer, sides very feebly increasing in width posteriorly ; wdth 



