1971] 
Barr — Trechoblemus 
143 
subconvex, distinct humeri present, prehumeral borders slightly 
oblique to mid-line; disc densely pubescent, microsculpture very line, 
nearly obsolete but perceptibly transverse and iridescent; inner three 
longitudinal striae more or less complete, fourth and fifth striae 
joining in apical third, sixth stria shorter than seventh, all striae 
somewhat irregularly punctulate and progressively shallower toward 
margin; intervals subconvex; apical recurrent groove rather short 
and subparallel to suture, joining third stria in a short crosier in 
advance of anterior apical puncture; humeral group of umbilicate 
punctures closely spaced against marginal gutter ; two discal punctures 
on fourth interval, anteriormost behind level of fourth umbilicate; 
apical triangle normal for genus. Antenna a little more than half 
total body length, with all segments more or less pubescent. Aedeagus 
of holotype 0.92 mm. long, gently arcuate, membranous above, with 
a ventral preapical boss, apex briefly and narrowly produced, finely 
reflexed at the very tip; copulatory piece single, concave toward 
right wall of internal sac, apically attenuate and rounded, about one 
third as long as aedeagus; parameres with five apical setae. 
Holotype male, Hillsboro, Washington County, Oregon, July 27, 
1965, taken in a black light trap by Kenneth Goeden; deposited in 
collection of the State Department of Agriculture, Salem, Oregon. 
Four female paratypes, taken in black light traps in northwestern 
Oregon, as follows: Marion County: Salem, July 15, 1969; 10 
miles northeast of Salem, August 9, 1969: Pudding River, 3 miles 
east of Woodburn, August 2, 1968. Washington County: 5 miles 
northeast of Newberg, August 1, 1966. 
Measurements of holotype: total length 4.6 mm., head 0.86 mm. 
long X 0.88 mm. wide, pronotum 0.84 mm. long X 1.08 mm. 
wide, pronotum 0.80 mm. wide at apex and 0.82 mm. wide at base, 
elytra 2.64 mm. long X 1.46 mm. wide, antenna 2.54 mm. long, 
aedeagus 0.92 mm. long. 
Discussion: Superficially T. westcotti closely resembles T. micros 
Herbst and T. postilenatus Bates, European and Japanese species, 
respectively. The apical recurrent groove, however, is less rounded 
than in those species, and the aedeagus with its less arcuate form, 
ventral preapical boss, and briefly produced, truncate, slightly reflexed 
apex is distinctive. The general form of the aedeagus recalls that 
of Trechoblemus micro phthalmus Ueno, from Takarajima, one of 
the Tokara Islands (Ueno, 1955, pp. 404-405, fig. 1), but T. micro- 
phthalmus is a smaller, brachypterous species with smaller eyes 
and smaller aedeagus. Among North American species of Trechinae 
