APRIL— JUNE, 1857.] Descriptions of neio CeylonColeoptera. 55 
quentibus 2 longiore, 2° parvo, 3-11 subaequalibus. Thorax sub- 
cordatus, basi trans versim truncatus leviterque prolongatus. Pedun- 
culus brevis. Elytra apice fortiter subquadrate truncata, costata, 
costis 16 majoribus, in interstitiis subtilissime bicostulata, in sulcis 
(sulco e tribus inter costas binas majores medio excepto) tenuiter 
pilosa, in omnibus tranaversim regulosa. Pedes anteriores tibiis 
sat fortiter emarginatis, tarsis maris art. 1-3 levHer dilatatis, subtus 
squamularum seriebus 2 munitis, art. 1 elongato-trigono, 2-3 
rotundato-trigonis, 3*^ prascedente parum minore, 4° parvo cordato 
3*^ plus sesqui minore, his omnibus angulis acuminatis, 5^ magno, 
unguibus eimplicibus. 
This diagnosis may appear somewhat vague, still I have been 
unable to express the characteristics ot the insects from which it is 
drawn in more precise terms, although they have features quite pe- 
culiar to themselves by which they are easily recognised when once 
seen. 
The points on which the three spec, which form this g. more or 
less disagree are the following : 1, the labrum: this is more trans- 
verse in H. elegans and less deeply emarginated in H. ruficollis 
than in the other two spec, respectively — still in all three it is eiyiar- 
ginated and has moreover the peculiarity of being furnished with 
bristles at the two anterior corners : 2, the mentum : this is sub- 
quadratically 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 nificollis this tooth is slightly 
emarginated, at the apex, it is sharply notched in H. himaculata, 
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 varia- 
tion from the emargination existing at the apex of the tooth of the 
former two species. 3, the palpi : these, labial as well as maxillary 
ones, have their terminal joint truncated at the apex — and so far 
again all three species agree — however, whilst this joint is of ellip- 
tic form in the palpi of H. nificolUs, it is in H, elegans only so in 
the labial ones that of the maxillary ones being cylindric at the base. 
