142 
Psyche 
[September 
Figure 2. Trechoblemus 'westcotti, new species. Hillsboro, Washington 
County, Oregon. Aedeagus of holotype male, length 0.92 mm., left lateral 
view. 
at present) and fairly wide distribution that Pseudanophthabnus 
ancestors had achieved prior to colonization of caves during the 
Pleistocene must have required a rather long period of time, a sup- 
position which at least accords with postulating an ancestral stock 
from the Northwest. 
Trechoblemus westcotti, new species 
Figures i, 2 
Length 4.3-4.8 mm., mean 4.5 mm. Pale castaneotestaceous, head 
a little darker, usually with a faint, nebulous, darker fascia on apical 
half of elytra; integument pubescent, shining, microsculpture finely 
isodiametric on head and very finely transverse, iridescent, on pro- 
notum and elytra. Functional wings present. Head rounded; 
labrum distinctly but not very deeply bisinuate; surface with scat- 
tered, rather long pubescence, especially on sides and beneath; eyes 
feebly convex, about 0.3 mm. high X 0.2 mm. long; mentum fused 
to submentum, mentum tooth conspicuous and deeply emarginate; 
1 1 -1 2 prebasilar setae. Pronotum transverse, about 1.3 times wider 
than long, disc convex, with long, rather dense pubescence; greatest 
width in apical fourth, widths at apex and base subequal to each 
other and also to length; sides arcuate in apical half, then con- 
vergent, distinctly sinuate in basal fifth; anterior angles prominent; 
hind angles large, sharp, prominent, a little less than right; ante- 
basal foveae large and deep; base entire; anterior marginal seta 
placed just behind greatest width, posterior seta just before hind 
angles. Elytra elongate-oval, 1.8 times longer than wide, broadly 
