172 
Psyche 
[Sept. 
the aedeagus, the terminally forked condition of the in- 
ternal sclerotized tube of the aedeagus and several other 
details of the male genitalia. 
Male. — Length 3.2 mm. Genitalia as in figs. 1, 1A, and 
IB. Mesal projection of seventh sternite small, acute. 
Lateral lobes of eighth segment produced into a tri- 
angular process, heavily setose, deeply incised dorsally; 
dorsad and mesad to this lobe appears a long attenuated 
process, directed gradually ventrad, bearing no setae. 
Most of ninth segment withdrawn into eighth, caudo- 
lateral corner irregular, apparent claspers projected 
caudad (and slightly dorsad in paratype) beyond re- 
mainder of genitalia, slender, subacute, bearing a few 
minute setae distally. Viewed from ventral aspect, fig. 
IB, claspers slender, diverging mesad, separated by a 
concave serrate ventral plate. Tenth tergite heavily 
sclerotized, all but a small portion hidden in ninth seg- 
ment ; when seen from lateral aspect it appears as a some- 
what inverted U-shaped structure, caudad branch digi- 
tate; viewed ventrally, fig. IB, apices truncate, almost 
touching on meson, base arcuate. LEdeagus with base 
wide, spiral filament encircles tube once, long and slender, 
extending along side of tube nearly to apex; apical por- 
tion divided into two prominent semi-membranous proc- 
esses, the shorter one bearing a large and two smaller 
spines, the longer one bearing a single large spine ; near 
their base the internal sclerotized tube terminates as a 
fork in a small semi-membranous process. 
Holotype, male. — St. Paul, Minnesota, August 1, 1934, 
light trap (A. A. Granovsky). 
Paratype, male. — Anoka Co., Minnesota, July, 1939 
(D. G. Denning) (specimen damaged). 
Orthotrichia americana Banks 
Records of Ross and the writer indicate that this spe- 
cies is widely distributed at least through the eastern half 
of United States. Minnesota: St. Paul, light trap, Au- 
gust 1, 1934, 4 male, 3 female; July 14, 1935, 2 male; 
June 20, 1935, 1 male (A. A. Granovsky). 
