British species of Scoparia. 515 
of moss-feeders, whose appendages are very much alike. 
Of these angustea (figs. 59-60) is at once distinguishable 
by the shortness of the aedoeagus (about 0°78 mm.), about 
three-quarters that of any of the others, which, however, 
vary a little. 
Frequentella (mercwrella) (figs. 54-56) has a very definite 
bend in the aedoeagus much like sudetica, 
Frequentella and sudetica (figs. 50-53) have the tenth 
sternite with a very low base and arch and a long, straight, 
rather slender shaft, with an almost bulbous tip in /ve- 
quentella present but not so pronounced in suwdetica. Sudetica 
has the opening of the “slipper” (of the uncus) extending 
nearly to the tip, in frequentella it arches over only about 
one-third from the base, 7. e. high up in the instep. 
Valesialis (fig. 58) is larger than any other of the moss- 
feeders, the clasps being 1:2 mm. long against less than 1:00 
for any of the others. The chitin is denser and darker. 
The aedoeagus, however, is small by comparison, 7. e. about 
the same length as the others (1:00 mm.) but narrow, viz. 
013 mm. The uncus is very similar to that of lineola. 
In /aetalis (figs. 64, 66, 70) the blunt end of the uncus 
characteristic of the moss-feeders is broader and more dis- 
tinctly notched in the middle than in any of the other 
species. The tenth sternite is about equally divided in 
length between the shaft and the basal arch, the shaft is 
of about uniform, rather narrow, width for its whole length, 
and the base spreads almost suddenly, with straight lateral 
margin from its lower end. 
Lineola (figs. 61-63) differs from any other member of 
this division (except /aetalis) in having the clasps much 
narrower than in them just beyond the dorsal margin of its 
attachment, agreeing in this very nearly with Jaetalis and 
pallida, e.g. in lineola the width at this point is 0°2 mm, 
and 0°33 at the widest point. In ¢rwncicolella the relative 
widths are 0°27 and 0°33, and in /aetalis 0°20 and 0:27 mm. 
The aedoeagus has a slight S bend and is rather broad 
(0°17 mm.), broader than any other except truncicolella, a 
fact the more conspicuous as the appendages as a whole 
are rather small. 
Murana (figs. 44-46) has a slightly shorter aedoeagus 
than the other species (except angustea) of this group 
(barely under 1:00 mm.). The uncus is at once distinguish- 
able as having the opening of the “slipper” very square, 
so that the two sides are of about equal width up to the 
