154 
Psyche 
[September 
.65 X width of head, 1. 3-1. 45 X eye height. Head, and also thoracic 
dorsum, polished, weakly alutaceous, obscurely punctate. Scutellum 
with a straight transverse groove at base. Propodeum without a 
median carina or a transverse carina margining the disc behind; sur- 
face somewhat alutaceous, especially on the posterior slope and side- 
pieces. Fore wing with subcosta, prostigma, and stigma distinct, 
median and anal veins indicated by very faint, hyaline streaks. Abdo- 
men relatively broad and short. 
Alate males are remarkably similar from throughout the range. 
However, California and Arizona males average larger than those 
from Mexico, and there is relatively little overlap in size. In the three 
California specimens head length is .293-. 320 mm. (mean .302). In 
the three Arizona specimens head length is .308-. 336 mm. (mean 
.320). In the twelve Mexican specimens head length is .253-. 294 
(mean .281 ) . 
Description of apterous male. — Total length about 0.7 mm. to 1.0 
mm. Head length .233-. 320 mm.; head width .68-. 77 X head length 
(mean .72). Tegulae normally developed, but wings completely 
absent; ocelli always present, although tending to be slightly smaller 
than in the alate males. Color as in alate males, except basal segments 
of antennae light brown in some specimens. Features of head as in 
alate males, except the head more parallel-sided, the eyes smaller and 
less protruding; minimum width of front .63-.6S X width of head, 
1.50-1.65 X eye height; distance from tops of eyes to vertex crest 
always greater than height of eye. Transverse groove at base of scutel- 
lum weak, sometimes barely apparent. 
One of apterous males from Plumas Co., California is unusually 
large (head length .32 mm., as compared to .296 for the next largest 
specimen, from Arizona). The smallest male is also from Plumas Co., 
California (head length .233 mm.), and in fact the mean head length 
is nearly the same for U.S. and Mexican males. 
Description of alate female. — Total length about 0.9 to 1.3 mm. 
Head length .288-. 370 mm.; head width .68-. 76 X head length (mean 
.72). Wings long, extending well beyond apex of abdomen; ocelli 
well developed. Coloration as in male, except antennal segment two 
and sometimes adjacent segments tending to be lighter brown than 
remainder of antennae. Mandibles and clypeus as in alate males. 
Antennae inserted well below bottom of eyes, distinctly shorter than in 
male; first four segments in a ratio of about 15:5 :2:2, segments three 
through eleven wider than long, apical segment about 1. 6-2.0 X as 
long as wide. Eyes weakly convex, protruding slightly from sides 
