512 Dr. T. A. Chapman on the 
mounting, the tenth sternite is of hard smooth chitin 
without hairs, anda very strong definite mark or fracture 
is seen if it be damaged. 
In basistrigalis (figs. 19-23) the uncus and tenth sternite 
are very like those of cembrae. The basal arch of the tenth 
sternite is narrower, and the branches enclosing it there- 
fore shorter, but the long spike of which it mainly consists 
is rather longer (total length about 0°6 mm.). 
The thickened upper margin of the clasp is more 
marked, and extends nearer to the end of the clasp. 
The lower marginal thickening is, however, much smaller, 
and its terminal spine lies almost parallel to the margin 
of the clasp. ‘The result is that the smooth, soft portion 
of the clasp looks larger. 
The aedoeagus is fractionally longer and narrower than 
in cembrae. The cornuti as seen within it are in two 
rows, those in each row partially united at their bases, 
the longer spines nearer the opening (a little over 
0:25 mm. long), and those of one group stronger but 
fewer than in the other. 
In ambigualis (figs. 8, 10, 11, 12, 18) (atomalis is 
identical) the uncus is narrower and shorter, as also the 
tenth sternite (about 0'4mm. long). The bridge is narrower 
and the two branches are less spreading, the margin of 
the long spine continuing down to the hinge in one 
smooth sweep, without any bend as in cembrae and 
basistrigalis. The thickened dorsal margin of the clasp 
is very definitely outlined. The basi-ventral thickening is 
intermediate between those two species, and the terminal 
spine is at an angle of about 45° to the margin of the 
clasp. Aedoeagus is a full millimetre long and about 
‘25 wide. The cornuti are in a group of two rather long 
(0:25 mm.) and strong, a third smaller, and three or four 
others diminishing so that the smallest is hardly visible. 
In manifestella (and ulmella) (figs. 14-18, 72) the cornuti 
of unknown number are fused together into one solid and 
rather thick mass, not unlike in form and appearance to 
the horn of a rhinoceros. The aedoeagus is short and 
broad, a characteristic of ‘“root-feeders.” The spines 
of the clasps are strong and sharp, and leave the clasp at 
about the middle of the lower margin. 
In gallica (figs. 89, 73, 74) the spines on the clasps are 
rather sharply hooked at the tips, and as compared with 
nearly all the other species they are thick and straight, with 
