306 NOTES ON AUSTRALIAN COLEOPTERA, 



This species is very distinct from any other of the genus that I 

 have seen but probably comes near simplex, Shp., (from Western 

 Australia) which I have not seen. It differs structurally from the 

 other species that I have dissected in having the maxillae denti- 

 culated only very obscurely within, and furnished with a long 

 pencil of hairs at the apex, but in the absence of any other 

 structural character I do not think this necessitates a new generic 

 name. The middle of the front margin of the clypeus is turned 

 up in the form of a small tooth, and there is a similar tooth at the 

 lateral angle on either side of the clypeus in front of the eyes. 

 The disc of the prothorax is obscurely flattened over a space some- 

 what similar in shape and extent to that occupied by the excava- 

 tion in N. Adelaidre, &c., but this is hardly noticeable unless an 

 example be placed side by side with an example of one of the 

 species having a large excavation ; in this species the real excava- 

 tion is very small and feeble, — decidedly more so than in any male 

 Isodon known to me. The sculpture of the elytra is very similar 

 to that of N. Adelaides, Blackb., but is a little stronger ; — there 

 are six strise running obliquely in pairs, — tlie whole surface bears 

 some fine sparse puncturatiou, — and the interstices (except those 

 between the stride of each pair) are sprinkled with punctures 

 similar to those in the striae, the larger system of punctures 

 becoming, however, gradually enfeebled from the suture to the 

 lateral margins. The front tibiae each have three strong but not 

 sharp teeth externally. The two spines at the apex of the hind 

 tibite are slenderer and sharper than in H. Adelaidce, &c., one of 

 them being strongly bent. The pygidium is less convex than that 

 of iV. Adelaidos (male) and more strongly punctulate ; it has a 

 similar strong fringe of long hairs at the base directed hindwards. 

 I should consider the specimen before me to be a female on account 

 of the shape of the pygidium were it not for the basal ventral seg- 

 ments being very short (as in the males of N. Adelaides, &c.), but 

 I think this latter character is decisive. If I should prove to be 

 mistaken in the sex, the present si)ecies would be distinguished 

 from the females of all others known to me of the genus by the 

 frontal horn, much slenderer spines at apex of hind tibiae, &c., &c. 

 N. Territory of S. Australia ; taken by Mr. Hedbloom. 



