56 



In Eiitoma the tibiae, so far as I liave been able to observe, 

 resemble tliose of Carenum, although I have not seen any species 

 in which the inferior ridge is so well defined as in Carenum, or 

 has more than four teeth. 



I do not find that the tibial characters of Neocarenum differ 

 in a manner likely to be generic from those of Conopterum. 



My very limited opportunities of examining anterior tibise in 

 Mr. Macleay's new genera Carenoscaphiis and Calliscapterus 

 point to the probability that the former differs from Carenum 

 in this respect only by the feebler development of the inferior 

 ridge, and the latter by the exceedingly strong development of 

 the same, together with the commencement of its serration 

 nearer to the apex of the tibia. 



In Laccopterum the " apical plate" of the tibia is not pro- 

 duced in the middle as in the preceding genera, and the serra- 

 tion of the inferior ridge does not extend above its apical half. 



Teratidium is unknown to me. 



The structure of the anterior tibiae in Euryscaplius does not 

 appear to distinguish that genus from Carenum. 



In Scaraphites the structure of the anterior tibia differs en- 

 tirely, the exterior ridge not passing to the underside of the 

 tibia, and the inferior ridge (instead of the external edge of 

 the apical plate) passing round the upper internal spine. 



The tibial structure in Geoscaptus is very like that of 

 Cwrenum, except that the apical plate is differently shaped. 



In Scolyptus and Glivina the structure is so different as to be 

 hardly capable of comparison with that of Carenum. 



I must again remark that my observations are founded on so 

 small a series of specimens that it is quite likely an examina- 

 tion of species I have not seen may considerably modify the 

 conclusions to be arrived at, but I think my observations 

 thoroughly establish the importance of a study of the characters 

 I have discussed. 



Another character of Carenum that appears to me capable of 

 being used to advantage in the discrimination of species is to 

 be found in the form of the elytral margin at the shoulder, 

 which varies to some extent, but appears constant in individuals 

 of the same species. In every Carenum known to me the lateral 

 margin of the elytra is conspicuously thickened (or increased) 

 at the humeral angle, but not always in the same way. In the 

 majority of species there is ?^mere thickening in a vertical direc- 

 tion (as in C. antliracinum, MacL), generally more or less 

 pointed at the apex, and having somewhat the appearance of an 

 ill-defined erect tooth, while in others (e.g., C. lcsvigafu}n,^Ln.cl.) 

 the thickened part is bent over, with its point directed more or 

 less towards the middle of the suture, as though the shoulder 

 of the elytron were " dog's-eared." This distinction is unques- 



