WALNUT APHIDES IN CALIFORNIA. 



33 



head and six on the prothorax. Tib he armed with a row of short bristles on their 

 inner margins. Beak pale, the extreme tip dusky, extending a little beyond the 

 anterior coxse. 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, 6). 



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,about21:IV,7to9;V,6tol0;VI,2to4(besidestheusualapical). 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; coxse, trochanters, apical five-sixths of femora, and basal four-fifths 

 of tibiae black; tarsi gray. Thoracic lobes and scutellum black. Under the wings 



