of the less-hnown groiqjs of Lamcllicorn Colcoptera. 487 



beyond the articulation with the second joint ; the 

 clypeus has a free edge all round, and the organs of the 

 mouth are bunched together and not visible from above. 

 The labrum is thick and more or less vertical, and the 

 mandibles are stout and not projecting. The elytra are 

 very ample, and the abdomen is always deeply sunk within 

 them. The claws are simple and symmetrical, and the sexes 

 are alike externally. 



The Hyhosorinae have the first joint of the antenna only 

 slightly enlarged and of normal form, the club globular 

 with the joints fitting one within the other. The clypeus 

 is flat, not pointed, and not covering the labrum and 

 mandibles, which appear to form a continuation of it. 

 The labrum is transverse, and lies upon the base of the 

 mandibles, Avhich are exposed at the front and sides. 

 The front tibiae are generally finely serrate along the 

 outer edge, with three larger and sharper teeth. The 

 claws are simple or toothed, and sometimes the front 

 claws of the male are unsymmetrical. The two sexes 

 often differ considerably. 



Sub-family.— i? YBOSOBINAE. 



Professor Kolbe has called attention to the absence of 

 this group from the Australian region, but the inclusion of 

 the genus Lijxcrochrus supplies this deficiency. In addition 

 to the genera I have already transferred to the group 

 must be mentioned Aporolaus, of Bates, which is very 

 closely related to Dicraeodon, Erichson, and indeed if other 

 species are found it will probably be necessary to unite all 

 under the latter name. " Coclodes, No. 2," of Bates, in the 

 Biol. Centr.- Americana, is a species of Dicraeodon. 



Hyhosorus rufuhts, described in a fragmentary manner 

 by Castelnau, has always been an object of uncertainty. 

 It was placed in the genus Coelodes in the Munich 

 catalogue and in ffajmlony chi is hy De Borre, who believed 

 it to be identical with H. Waterhousei, Westw. I 

 believe this to be right as regards the genus but not 

 the species. I have examined female specimens from 

 Haiti, determined, I think correctly, as H. rufulus, and 

 associated with H. Waterliousei, of which only a single 

 male from Cuba was described by Westwood. The other 

 sex of that species I do not know, but the true male of 

 H. rufulus is a very remarkable insect which has not 



TRANS. ENT. SOC. LOND. 1909. — PART IV. (DEC.) K K 



