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taceous, broacl laterally, the apex upcurved and furnished with
three bristles proceeding from denticulations of the edge, and
on the upper edge near the base are about four similar bristles
and denticulations on a dilated portion. Penis broad, flat,
ob-titse, placed below the last-named appendages. Inferior
append-ages large, widely divergent, rather narrow at the base, but
gradually dilated so that the extremities are broad and very
obtuse, convex externally and concave internally, fringed with
long yellowish hairs; on the upper edge, near the apex, there
is a deep exeision in which is a strong curved spine and one
or two ridges or teeth (precise conformation of this structure
is difficult to discriminate). No ventral teeth.
Expanse about 15 mm.
Tbe above description is taken from dry examples.
In examples of the V in alcohol the abdomen above and
beneath presents blackish ehitinous plates separated by broad
pale segmental divisions.
The only $ (in alcohol) has the abdomen elongated, and
the wings apparently somewliat abbreviated.
M. scissum is clistinct from all the described species of the
genus in the form of the anal parts of the o*, and especially
in the divided »dorsal lobe», which finds no parallel in any
known species. This is satisfactory because the genus is one
of the most difficult in which to define the species with any
approach to certainty.
Micrasema sp. nov. — One ? from Port Clarence, Alaska,
20th July, is abundantly distinet from M. scissum, but it is
useless to gi.ve it a name in the absence of the rf. Judging
from the example in alcohol it should be nearly entirely of a
yellowish hue instead of the dark colour usual in tlie genus.
The generic position appears certain, and the genus is becoming
of great interest in consequence of the position it is gradually
acquiring in the aretie insect-fauna.
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