130 
Psyche 
[December 
construction of the third antennal sense organ; d) differ- 
ent pattern of the genital plate of the male (see figure) ; 
and e) the unusual shape of the third antennal sensory pegs. 
Measurements 
All segmental measurements and ratios taken of im- 
bricate areas along the middorsal line, and are exclusive 
of intersegmental membranes. All measurements in 
millimeters. Holotype: total length, excluding antennae, 
1.35; cephalic diagonal, .26; thoracic segment one, .07; 
thoracic segment two, .14; thoracic segment three, .15; 
abdominal segment one, .14; abdominal segment two, .15; 
abdominal segment three, .14; abdominal segment four, .15; 
abdominal segment five, .09; abdominal segment six, .08. 
Segmental ratios for size range .60 - .66 mm.: 
(thoracic segment 2—10) 
total cephalic thoracic segment 
antenna diagonal 2 3 
mean ratio 23 26 10 8.9 
average deviation 1.0 1.0 X .3 
mean ratio 
average deviation 
abdominal 
segment 
hind 
1 2 
3 4 5 
6 
unguis 
6.6 6.9 
7.2 9.5 7.1 
2.9 
.50 
.5 .3 
.4 .3 .9 
.3 
.04 
(antennal segment 3=10) 
antennal 
1 2 
mean ratio 6 11 
average deviation .9 .7 
segments 
3 4 
10 18 
X 1.0 
(fore unguis=10) 
fore fore hind hind 
unguis unguiculus unguis unguiculus 
mean ratio 10 4.4 11 5.4 
average deviation X .5 .4 .5 
Type locality: Umiat, Colville River, Alaska, July 4, 
1949, Neal A. Weber, collector. The holotype and fifty 
paratypes are being deposited in the United States National 
Museum, Washington, D. C., and thirty-five paratypes 
are being deposited in the Museum of Comparative Zoology, 
Cambridge, Massachusetts. 
