38 F. E, Wilson: 



This species may be readily distinguished from M. nodipennis,. 

 Macl.,^ by its different colouration, its much more even pro- 

 thoracic surface, and the absence of the nodular excressences on 

 the elytra, which is so characteristic a feature of that species. 



My friend, Mr. Fischer, and myself first secured this species 

 from beneath the bark of red gums that had been recently flooded 

 by the overflow of the Yarra. Other specimens were found 

 by me later under a piece of bark lying on the ground, and be- 

 neath stones. 



Type in author's collection. 



PSELAPHIDAE. 



Articerus wilsoni. Lea. 



(Trans, and Proc. Roy. Soc. S. Aust., xliii., 1919, p. 169.) 



This species, which was named by Mr. A. M. Lea from speci- 

 mens which I secured from nests of Iridiomermyx detectus, at 

 Eltham, near Melbourne, evidently is widely distributed, as a 

 (? example was found by me last October in a nest of the same 

 ant at Caboolture, some thirty miles north of Brisbane. Mr. Lea 

 tells me that Mr. Elston has also lately obtained a specimen 

 from a nest of /. detectus near Adelaide, so that probably wher- 

 ever this ant is located specimens of the Pselaphid will be found 

 also. 



SCARABAEIDAE. 



Panelus bidentata, n. sp. 



Upper surface generally black, but with sides of prothorax 

 towards apex, shoulders, and a spot on each elytron on outer 

 edge near apex, red ; basal 2 and apical 3 joints of antennae darker 

 than the intermediate ones; legs with femora and tibiae dark 

 testaceous. Under surface with palpi and prosternum testaceous, 

 the rest blackish. 



Head large, depressed in front, somewhat convex behind, 

 armed with two prominent prongs jutting out in front, space 

 between prongs evenly rounded, punctures numerous and well 

 defined, becoming slightly larger towards base. Prothorax about 

 one and a-half times broader than long, moderately convex, sides 

 sub-parallel to within about one-third of apex, then strongly nar- 

 rowed; puncturation much as on head. Elytra at base slightly 



1. Trans. Ent. Soc. N.S.W^., vol. ii., pp. 150. 



