NEW MELOLONTHINI FROM AUSTRALIA 317 



This species is closely allied to S. obtusus, but it is larger, 

 and differs by several minute distinctions in the form of some 

 of the parts, such as the labrum and tarsi; though these diffe- 

 rences cannot be easily conveyed by a verbal description , I think 

 that the difference in the apex of the elytra, if it prove to be 

 constant, will afford an easy means of discriminating the two 

 species. 



I have seen only a single specimen which was sent from 

 Western Australia by M. r Duboulay. 



Atholerus. 



Antennas 9-jointed, third joint rather long, the six apical 

 joints very similar to one another, and forming a moderately 

 long club. Maxillary palpi neither very long, nor very slender, 

 2. nd joint a good deal shorter than the 4. th . Mentum rather 

 broad and not very long, the labial palpi short, and their ca- 

 vities of insertion separate, so that they are not contiguous at 

 their base, and are not inserted at the extreme apex of the 

 mentum. Labrum large, but transverse, and with only a single 

 part visible from above. Hind legs moderately thickened and their 

 tarsi rather long. 



This form is perhaps that to which Prochelyna heterodoxa Er. 

 is nearest allied, but according to Burmeister that insect has a 

 very small, slender mentum: while in the form here named 

 Atholerus the mentum is broad and large. 



Atholerus obscurus n. sp. Nigricans, antennarum basi peclibasque 

 rujisj his tibiis tarsisque piceis, opacus, sitpra nudus, subtus 

 griseo-pubescens; clypeo fortiter rugoso-punctato; prothorace ornnino 

 opaco et impunctato: elytris basin versus indeterminate fusctSj im- 

 punctatis, sed versus suturam striatis; pygidio laevi nitido. Long. 

 13 millim. 



Found at Swan River by M. r Brewer. 



