WALNUT APHIDES IN CALIFORNIA. 
33 
head and six on the prothorax. Tibiae armed with a row of short bristles on their 
inner margins. Beak pale, the extreme tip dusky, extending a little beyond the 
anterior coxae. The young oviparous female is entirely pale yellow and can be dis- 
tinguished from the young viviparous female only by its more eliptical shape, that 
of the latter being more oval. Measurements: Length of body, 1.89 mm.; width of 
body, 0.92 mm.; antenna, joint I, 0.075 mm.; joint II, 0.042 mm.; joint III, 0.312 mm. 
joint IV, 0.203 mm.; joint V, 0.218 mm.; joint VI, 0.167 mm.; filament, 0.108 mm. 
cauda, 0.080 mm.; cornicles, 0.009 mm. 
Described from numerous specimens, Walnut Creek, CaL, October, 
1912. 
WINGED MALE (FIGS. 17 ; 18, b). 
General color pale green or greenish yellow. Head and prothorax olive-green. 
Frontal margin of head and frontal margin of prothorax, black. Prothorax with two 
Fig. 17.— Monellia caryella: Winged male. (Original.) 
bluntly rounded dusky tubercles on the dorsum. Dorsum of head and thorax with 
indefinite dusky markings. Eyes red. Antennae dark olive-green, about three- 
fourths of the body in length; joint VI longer than its filament. Sensoria as follows: 
III, about 21: IV, 7 to 9; V, 6 to 10; VI, 2 to 4 (besides the usual apical). Wings of mod- 
erate size; insertions and subcosta greenish-yellow; stigma light brown, with a paler 
central area ; discoidals 1 and 2 thicker than the other veins and with a narrow smoky 
border; stigmatic vein obsolete except for its apical third; veins brown. Legs pale 
greenish-yellow; coxae, trochanters, apical five-sixths of femora, and basal four-fifths 
of tibiae black; tarsi gray. Thoracic lobes and scutellum black. Under the wings 
