144 Mr. H. W. Bates’s Notes on Longicorn Coleoptera. 
groups Gleneides and Amphionychides may be therefore 
looked upon as to some extent representative forms. 
The researches of entomological travellers during the twelve 
years that have elapsed since Lacordaire’s classification was 
published have immensely increased the amount of material 
in these groups at the disposal of the student. The total 
number of species mentioned by Lacordaire was 83; in the 
list which terminates the present memoir I enumerate 220, 
including the new species which I here describe from my 
own collection; and there are doubtless many other species 
still undescribed in public and private museums. The new 
species do not furnish any fresh element rendering indispen- 
sable a modification of Lacordaire’s division into two groups; 
but they bridge over the gap which divided them in the state 
of our knowledge at that time, so that neither the retracted 
head nor the carination of the elytra can now be said to afford 
reliable group-characters ; in fact they are of little more than 
specific value in some of the genera. It is convenient, how- 
ever, for the present to retain the two groups. ‘Two of the 
genera, Pretilia and Sphallonycha, break the uniformity of 
the groups in the structure of the tarsal claws, having the 
basal tooth short and broad; but they cannot be withdrawn 
without necessitating the institution of two other groups for their 
reception, the two genera differing from each other greatly in the 
form of the elytra and head, although agreeing in the dentation 
of theclaws. Zenicomus (Thomson) I remove trom the Amphio- 
nychides, with which it agrees in none of its principal cha- 
racters. It is in fact a member of the Calliides group, and 
is scarcely different generically from Chereas. On the other 
hand I include Amillarus (Thomson), which Lacordaire, 
overlooking its true affinities, placed in a widely different 
part of his system. The tarsal claws in this genus have 
undergone a remarkable modification of position, the long 
basal teeth being soldered to the stems of the claws and closely 
joined at the base, so that the claws have become “‘ divergents”’ 
instead of “ divariqués” as in the rest of the Saperdine. 
There can be no doubt, I think, that Améllarus is closely 
related to Hrana, especially to such species as L. dispar, in 
which the sexes differ similarly m form and colour. Its 
longer prosternum and free head, however, necessitate our 
including it in the group Afrénicides. 
