WALNUT APHIDES IN CALIFORNIA. 



31 



THE WINGED VIVIPAROUS FEMALE (FIG. 15). 



General color pale lemon-yellow, somewhat varying in shade. Antennae about 

 four-fifths as long as the body, pale yellow, with joints III to VI, inclusive, bearing 

 an apical black ring (on joint III this ring is narrower than the other joints); fila- 

 ment of joint VI dusky; joint III is the longest; joints IV and V subequal or joint IV 

 slightly longer than V; joint IV about four-fifths as long as III; joint VI together with 

 its filament about equal to V; filament about three-fourths as long as VI; basal third 

 of joint III noticeably swollen and bearing from five to seven oval transverse sensoria; 

 usual apical sensoria on both joints V and VI. Head pale yellow, with the frontal 

 margin black. Eyes bright red. Pro thorax pale yellow, with two narrow, black, 

 longitudinal stripes arising from the anterior angles and extending for two-thirds 



Fig. 15. 



-Monellia caryella: Winged viviparous female, 

 number of sensoria. 



a, Right antenna, enlarged, with variations of 

 (Original.) 



of its width. Thoracic lobes and scutellum light brown, sometimes with a salmon- 

 pink tinge. Wing insertions, costa, subcosta, and stigma pale lemon-yellow; dis- 

 coidals yellowish -brown; first and second discoidals heavier than the other veins; 

 third discoidal obsolete at its immediate base, its first fork equidistant from the 

 second fork and the base of the discoidal, its second fork nearer to the first fork than 

 to the apices of its two branches; branches of second fork equal in length; stigmatic 

 vein very weak, its basal half traceable only with difficulty; lower wing colorless. 

 Legs pale yellow; tarsi and tibial apices dusky. Abdomen entirely pale lemon- 

 yellow, the body widest at the third segment. Body somewhat narrowed laterally. 

 Cornicles pale yellow, hardly perceptible, wider than long. Cauda globular, bearing 

 a fringe of weak hairs, about equal in length to the hind tarsi, concolorous with the 

 abdomen. Genital plates armed with weak hairs, pale yellow. Beak pale yellow, 

 its extreme tip brown, extending halfway between first and second coxse. Measure- 



