WALNUT APHIDES IN CALIFORNIA. 
17 
oval gray transverse spots on the fifth segment, which are separated by a space equal 
to their length. Cornicles pale yellow, about as broad at the base as long, very much 
as in the winged female. Cauda pale yellow, globular, not quite as long as the hind 
tarsus. Sexual organ pale yellow. Beak pale yellow, slightly exceeding the fore 
coxse. Sterna black. Sensoria transversely oval, situated in an irregular row as 
follows; joint III, 11 to 16; joint IV, 5 to 7; joint V, 4 to 5; joint VI, 2 besides usual 
terminal. 
Measurements: Length of body (average), 1.47 mm.; width of body (maximum), 
0-48 mm.; expanse of wings (average), 4.20 mm; antenna, joint I, 0.05 mm.; joint II, 
0.04 mm.; joint III, 0.34 mm.; joint IV, 0.12 mm.; joint V, 0.12 mm.; joint VI, 0.08 
mm.; filament, 0.03 mm.; cornicles, 0.05 mm. 
~Fig. 8.— Chrornapliis juglandicola: Winged male (appendages of left side removed), a, Left antenna. 
(Original.) 
Described from many individuals collected in 1911 and "* 12 at 
San Jose, Cal. 
Both the male and the winged viviparous female ~±ien disturbed 
have a habit if jumping psyllid-like into the air. Their flight is 
generally in the form of a long spiral, and when disturbed they fly in 
an upward direction. 
EGG DEPOSITION. 
/ 
As mentioned before, the first sexual females of the year remain 
longer on the leaves after they have reached the adult state than 
those developing later. In 1911 eggs were not observed in the 
field until September, or seven weeks after the first appearance of 
sexual females. In 1912 some eggs appeared in August. This long 
period between the first appearance of the sexed females and the 
40859°— Bull. 100—14 3 
