Rhynchophorous Coleoptera of Japan. 101 
separately, as there is nothing to show to what species 
they belong. This is more than one-fourth of the genus 
as at present known, but only a small proportion of the 
species existing in collections have been described. 
Kichhoff in his “ Ratio Tomicinorum ” groups the species 
by the shape of the prothorax, and thereby obtains a 
satisfactory result. I have found his table of species 
easy to work with, but cannot adopt it for the Japanese 
forms, as.in certain species, e.g., X. validus, praevius, 
seriatus, the form of the prothorax is either ambiguous, 
and could be used to place the species in more than one 
of Kichhoff’s sections, or is of a shape that would dis- 
sociate the insect from its allies. Some previous 
familiarity with the forms met with in the genus is 
necessary in order to locate these doubtful species. 
I have, therefore, in drawing up a table, laid less stress 
on this character, and have aimed simply at differentiating 
the species rather than arranging them in a natural 
sequence. ‘The three species of males referred to are not 
included in it ; their characters will be found on page 119. 
TABLE OF SPECIES. 
1. Elytra confusedly punctured, not inevidentrows. . . . 2 
with distinct rows of puhctures. . . .. . <p 00 
2. Form elongate, prothorax longer than broad, pelliculosus, Fichh. 
short, prothorax not longer than broad . . . . . 38 
3. Elytra abruptly truncate at apex, black. . . . . ... 4 
gradually declivous at apex, ferruginous, 
semi-opacus, Kichh. 
4. Prothorax with two tubercles in middle of apical margin, 
mutilatus. 
without tubercles on apical margin . brevis, Eichh. 
5. Prothorax entirely dull, uniformly and closely asperate. . 6 
with posterior half more or less shining, punctured 7 
6. Interstices of elytra with irregular double rows of ar 
eis? 
with single rows. . . rubricollis, Bichh. 
7. Prothorax subglobose, not longer than broad, or subrect- 
angular with sides and apex separately 
rounded; declivity usually carinate below . 8 
oblong, cylindrical, with apex strongly rounded; 
if not longer than broad, declivity of 
elytra not carinate below . ... . .16 
