142 Entomological Papers. [No. 2. 



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 rujicollis, 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, the labial as well as maxillary, 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. rufloollis, it is in II. elegans only so in the labial 

 ones that of the maxillary ones being cylindric at the base. In 

 H. bimaculata finally this joint is rather club-shaped or subtriangular 

 and more strongly truncated than in the former 2 species. (4) the 

 ligula: this organ is of subcoriaceous texture, middling size, the 

 shape of an oblong square, free and transversely truucated at the 

 apex — these characters are common to all 3 spec, and in H. ruficollis 

 I have nothing to add to it ; however, the anterior margin, which 

 is straight in this species, is slightly bisinuated in H. elegans the 

 outer angles being acute and the central one obtuse. The ligula 

 of H. bimaculata differs from both the former in as far as it is 

 narrowed towards the apex and depressed towards the sides and 

 the front, the anterior margin is otherwise cut away straight, with- 

 out any sinuosities, but it is rather strongly armed with bristles. 

 The paraglossse agree in all 3 spec, in as far as they are highly 

 developed, reach much beyond the anterior margin of the ligula and 

 are more or less bent inwards. Their greatest development they 

 assume in H. elegans in which they nearly touch each other in 

 front of the anterior margin, being cylindric and slender at the 

 same time. In H. ruficollis the paraglossse are somewhat shorter 

 and straighter and in H. bimaculata still more so. 



On all other points the 3 spec, perfectly agree, in saying which 

 I lay particular weight upon the unusual sculpture of the elytra 

 and the rather peculiar hairy vesture of the insects, bearing also 

 in mind their general appearance, proportions, system of coloration, 

 mode of living, etc. As to the hairy vesture of certain parts of the 

 body and the sculpture of the elytra, it is true that these are not 



