1963] 
Evans — Cephalonomia 
155 
of head, covered with short hairs; eyes removed from base of 
mandibles by about .3 their own height, removed from vertex crest 
1. 1 -1. 2 X their own height. Minimum width of front about .65 X 
width of head, 1.3 5- 1.40 X eye height. Head and thoracic dorsum 
polished, obscurely alutaceous, barely punctate. Transverse groove at 
base of scutellum present but rather weak. Propodeum and wings as in 
alate male. Abdomen depressed, the sting visible in most specimens. 
As in the males, alate Arizona females tend to be largest (mean 
head length .337), California females next (mean head length .330), 
Mexican females the smallest (mean head length .314). These differ- 
ences are very slight, and there is a broad overlap in size in specimens 
from all these areas. It should also be noted that the three alate 
females from zones A and B in California (Table I) have a mean 
head length of .350, while those from zone D in California average 
smaller (mean head length .327), approaching the mean for the Mexi- 
can specimens. 
Description of micropterous female. — Total length about 0.9-1. 3 
mm. Head length .336-. 364 mm.; head width .71-. 78 X head length 
(mean .75). Wings, .09-.11 mm. long, about twice the length of the 
tegulae, extending slightly beyond anterior margin of propodeum; 
ocelli distinct, fully as strong as in alate female. Dark brownish- 
fuscous; antennae brown, basal flagellar segments somewhat paler 
than the others; legs as described for alate males. Head differing 
from that of alate female only in having the eyes slightly smaller, 
removed from base of mandibles by about half their own height, mini- 
mum width of front about 1.6 X eye height. Scutellum separated 
from mesoscutum by a thin line, also with a weak transverse basal 
groove. Other features as in alate female. 
It will be noted that the micropterous females, all of which are 
from the San Francisco Bay region (Zone A in Table I), are con- 
siderably larger than the average for the fully alate females. The 
mean head length is .346 mm., considerably more than even that of 
the Arizona alate females. Also, the mean of the head width/length 
ratio is .75, considerably above the .72 mean ratio for the fully alate 
females. This ratio is not plotted on Figure 2, since the number 
of specimens is so small that one cannot be certain that there is any 
real difference in this regard from the alate females. 
Description of subapterous female. — Total length about 0.8- 1.2 
mm. Head length .267-. 363 mm.; head width .61-. 71 X head length 
(mean .655). Wings about .05-.07 mm. long, barely if at all longer 
than tegulae, usually reaching but scarcely exceeding anterior margin 
