Three Genera of Papuan Passalid Coleoptera. 111 



larger than the right. The inner tubercles äre well developped in fresh 

 specimens. The margin of the canthus is more or less concave; when 

 the concavity is very pronounced the anterior angles of the head and 

 the external angle of the canthus are tooth-like, but this is not a constanl 

 nor even a usual characteristic of the species. The frontal area is usually 

 about twice as broad as long, and rectangular or semi-circular; but in 

 the eighl specimens from Squally Island, which are of a uniformly large 

 size and probably belong to a Single colony, it is three or even four 

 times as broad as long'. The parietal ridges extend directly outwards 

 from a little behind the apex of the central tubercle, and are curved 

 backwards at their extremities. The upper suiiace of the prothorax 

 is smooth and unpunctured, except in the scars, and as a rule in the 

 anterior angles, where the extent of the puncturing is very variable, and 

 on the whole greater in small specimens than in large ones; the median 



Fig.3A. 

 Ilcail of Omegarius minimus, KüWERT. I. 



groove is distinct and practically complete, the marginal groove is widelj 

 incomplete both before and behind. The posterior angles of the lower 

 surface of the prothorax are finely punctured and hairy, the punctures 

 and hair being continued as a rnle along the onter margin of the other- 

 wise smooth and hairless anterior angles, especially in small specimens. 

 The scutellum is smooth and unpunctured except in the middle of the 

 anterior margin. The mesothoracic episterna are punctured above 

 and along- the anterior margin; behind they are smooth and polished. 

 The mesosternum is smooth and polished excepl in the scars which. though 

 somewhat variable, are usually well developed, and matt wholly or in 

 pari The lateral areas of the metasternum are narrow, parallel-sided, 

 finely and closely punctured; the intermediate areas are more coarsely 

 and less closely punctured on the inner side, smooth and unpunctured on 

 the outer. The posterior parts of the hind coxae are nol stronglj 

 punctured; the abdominal sterna are more or less finely punctured in 

 the scars. The elytra are hairless. and smooth excepl in the grooves, 

 of which the onter are mach more coarsely punctured than the inner. 



