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Trichoptera.
Fara. Limnophilidse.
Chilostigma praeteritum, Walker (Mc Lach., Revision and
Synopsis, Supplement p. xlii). — Five tubes contain this species,
all from the »winter station» (Pitlekaj & vicinity), July 1879,
about 30 examples in all, of both sexes.
This species was originally discovered by Sir John
Richardson in the district of the Slave and MacKenzie Rivers,
Arctic America. Recently Dr J. Sahlberg found & &t
Ni-kandrow Island, Yenissei, Sibiria. No doubt the species is
cir-cumpolar.
I do not find that the small nervule connecting the
sub-costa and radius near the end (Cf. Revision & Synopsis, Suppl.,
p. xliii) is constautly present in the »Vega» examples.
Fam. Sericostomatidse.
Micrasema scissum sp. nov. — Nearly 30 examples (of
which only one is a 9) of a Micrasema were found at St.
Lawrence Island, Behring Straits on August 2nd, 1879. It is
cer-tainly undescribed, and I append a description.
Black: head, basal joint of antennae, and apical portion of
abdomen clothed with greyish-yellow hairs. Antennae uniformly
blackish-fuscous. Palpi fuscous: maxillary pair in the c? rather
short, upcurved, the second and thirdjoints nearly equal. Legs
blackish-fuscous, the tarsi with a testaceous tinge. Abdomen
blackish, with grey lateral Iines. Wings somewhat elongate,
pale-grey with short yellowisli pubescence; pterostigmatic region
darker and more opaque in the anterior wings; neuration
fusces-cent: in the anterior wings the discoidal cell is elongate and
narrow; lst apical fork verv oblique at its base, 2nd apical fork
with a long footstalk, 3a apical fork sessile or nearly so;
nervule closing the discoidal cell in an oblique line with that
below it.
In the c? the 9th dorsal segment is narrow, produced into
a small median triangle; below it is the »dorsal lobe» which
is divided nearly to its base into two stout slightly-curved
obtuse finger-shaped processes. Intermediate appendages (?) tes-
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