1914.] 



265 



an extremely broad, concave, hammer-shaped club, the inner face of 10 con- 

 volute, 11 with a hook-like spine at the apex. Prothorax transverse, narrowed 

 anteriorly, transversely depressed on the disc before the base. Elytra much 

 wider than the prothorax, subparallel in their basal half, obliquely depressed on 

 the disc below the base. Legs slender; posterior femora much thickened, simple; 

 posterior tarsi with joint 1 much longer than the others united. Length, li mm. 



Hab. : Queensland, Cairns. 



Described from a single example, captured by Dr. E. C. L. Perkins 

 during his visit to Australia a few years ago. The g antennal struc- 

 ture is quite unlike anything known to me amongst the Xylophilids, 

 and it is suggestive of that occurring amongst the American Malachiids 

 of the genus Collops ; but in this latter case the malformation is 

 restricted to the second joint, whereas in the Heteromerous insect now 

 described it is transferred to the ninth and tenth joints which together 



appear to form a sensitive clasping organ. The accompanying excellent 

 figures, drawn by Mr. Horace Knight, illustrate this peculiar structure 

 better than any description : (a) a portion of the left antenna with the 

 tenth and eleventh joints pushed forward, and the eleventh raised ; 

 (6) a portion of the right antenna with the apical joints in their 

 normal resting position, the eleventh thus appearing to be placed 

 before the tenth. The above correction in the synonymy affects the 

 names of four species : lateralis, Blackb., fasciatus, Boh., crassicornis, 

 Pic, and humeralis, Lea, all of which are pre-occupied. 



Horsell, Woking : 



October 20th, 1914. 



