Ceylon Coleoptera, 53 



interstitiis subtilisslnie bicostulata, in sulcis (sulco e tribus inter costas 

 binas majores medio excepto) tenuiter pilosa, in omnibus transversim 

 rugulosa. Pedes anteriores tibiis sat fortiter emarginatis, tarsis maris 

 art. l-3leviter dilatatis, subtus squamularum seriebus 2 munitis, art, 1° 

 elongato-trigono, 2-3 rotundato-trigonis, 3o prsecedente parum minore, 

 4o parvo, cordato, 3° plus sesqui minore, his omnibus angulis acuminatis, 

 5° magno, unguibus simplicibus. 



This diagnosis may appear somewhat vague, still I have 

 been unable to express the characteristics of the insects from 

 which it is drawn in more precise terms, although they have 

 features quite peculiar to themselves by which they are easily 

 recognized when once seen. 



The points on which the 3 spec, which form this g. more 

 or less disagree are the following : 1) the labrum : this is more 

 transverse in H. elegans and less deeply emarginated in H. 

 ruficollis than in the other 2 spec, respectively — still in all 3 

 it is emarginated and has moreover the peculiarity of being fur- 

 nished with bristles at the 2 anterior corners; 2) the men turn: 

 this is subquadratically emarginated, the lobes being strongly 

 rounded on the outer side and abruptly acuminated at the 

 apex, at the base of the emargination it is furnished with a 

 broad, excavated tooth which is inflected and obtuse at the 

 apex — so far all three species agree — however, whilst in H. 

 elegans and ruficollis, this tooth is slightly emarginated at the 

 apex, it is sharply notched in H. bimaculata, in fact bilobed, 

 the lobes being large and rounded at the apex. I look upon 

 this notch, which is sharp but not deep, as a mere variation 

 from the emargination existing at the apex of the tooth of the 

 former 2 species ; 3) the palpi: these, labial as well as max- 

 illary ones, have their terminal joint truncated at the apex — 

 and so far again all 3 species agree — however, whilst this joint 

 is of elliptic form in the palpi of H. ruficollis, it is in H. ele- 

 gans only so in the labial ones, that of the maxillary ones being 

 cylindric at the base. In H. bimaculata finally, this joint is 



