29 
not possible for me to place WN. Blackburni, Waterh., in the 
following tabulation, as I have not seen any insect that I can 
identify “with it and the description does not ‘happen to mention 
the characters that I rely upon for purposes of tabulation. The 
species of Natalis are for the most part closely allied inter se, and 
unfortunately [ cannot find any external sexual character 
sufficiently conspicuous and uniform to enable the sex of a 
specimen to be certainly determined at a glance. The most 
workable distinction of the sexes that [I have been able to find 
consists in the hind tarsi in one sex (no doubt the male) being 
notably longer and more slender than in the other sex; the same 
sex moreover usually has a longer and narrower prothorax, the 
eyes a trifie less widely separated and (in most species) some 
peculiarity of sculpture in the ventral segments. There is also 
in the same sex a tendency to a lengthening of the third joint of 
the antennz 
IT may add that in 1893 M. Kuwert described a Natalis from 
N. Australia under the name WN. alternicostatus. I have not seen 
the description, but should judge from the name that it is 
extremely unlikely to be any of the new species described in this 
paper. 
The following tabulation contains, I believe, the names of all 
the described species of Natalis except Blackburni, Waterh., and 
alternicostatus, Kuwert. 
*A. Disc of prothorax not closely and evenly punctulate. 
B. Size about 18 1. (elytra rounded at apex) ... Titana, Thoms. 
BB. Species rot at the same time of great size and 
with elytra rounded at apex. 
C. Elytra mucronate at apex = ..  spinicornis, Blackb. 
CC. Elytra rounded at apex. 
D. All the elytral interstices evenly convex 
throughout .. integra, Blackb. 
DD. The elytral interstices not all conspicu- 
ously and evenly convex. 
E. The intermediate tibiz straight or 
nearly so. 
F. Joints 9 and 10 of the antennz quite 
strongly transverse semicostata, Blackb. 
FF. Joint 10 feebly, joint 9 not, transverse lata, Waterh. 
EE. The intermediate tibiz quite strongly 
arched. 
F. Length of prothoracic sulcus not greater 
than distance from its apex to apex 
of prothorax. 
G. Elytra with numerous fascicles of 
short whitish hairs Leai, Blackb. 
GG. Elytra not saat with whitish 
fascicles... lugubris, Blackb. 
* In N. longicollis the sculpture of the prothorax is intermediate between 
A and AA. 
