Australia)! and Tasmania)) Colcopteva. 123 



iiiteifere with it in any way. Tlie species is common under logs 

 which have most of their under surface free from the ground ; 

 and, although often seen near ants' nests, I cannot remember 

 seeing more than this one specimen actually in a nest. 



Myrmedoiiia clavigera, Fvl. 

 One specimen taken in a nest of a small red ant. 



Polylohus seminjmcus, n.sp. 



Head, elytra and metasternum piceous-brown, prothorax some- 

 what paler, abdomen testaceous, towards apex somewhat darker ; 

 legs and palpi flavous ; antennae smoky brown, but basal joints 

 somewhat paler. Head, prothorax and elytra opaque, abdomen 

 shining. 



Head slightly transverse, base rounded. Eyes small. An- 

 tennae slightly passing base of prothorax, slightly thickened 

 towards apex, most of the joints transverse. Prothorax lightly 

 transverse, front angles obtusely rounded, hind angles almost 

 rectangular, sides almost parallel, a wide shallow depression on 

 each side ; with dense, minute punctures. Elytra not much 

 wider than prothoi'ax, sides very feebly dilated posteriorly ; 

 with dense, small punctures. Abdomen about half total length, 

 parallel-sided, margins strongly raised, especially towards base ; 

 punctures indistinct. Length \\, to apex of elytra f mm. 



Hah. — Tasmania : Hobart, Huon River, Launceston. In nests 

 of Ectatomma metallicum (A. M. Lea). 



The elytra are usually diluted with testaceous towards the' 

 base ; the apical half of the abdomen is somewhat darker than 

 the basal half, but there is no sharply defined meeting of the 

 shades of colour. The prothorax, although paler than the head, 

 is never so pale as the base of the abdomen. 



Readily distinguished from all the following species by the 

 opaque head, prothorax and elytra, with the prothorax shal- 

 lowly bifoveate, although from some directions the imjDressions 

 are indistinct. 



On this and the five following species the clothing is much 

 alike, and consists of dense fine pubescence on the lower surface 

 of abdomen, rather sparser and longer on its upper surface, very 



