WALNUT APHIDES IN CALIFORNIA. 
25 
YOUNG MALE PUPA. 
Light red in general color; appressed closely to the leaf surface. Dorsum of head 
in front black, behind gray. Dorsum of thorax gray. Antennas six-jointed (i. e., 
with five joints and filament), one-third as long as the body, pale gray. Eyes bright 
red. Legs pale, femora dusky gray. Mesothorax, metathorax, and first five abdominal 
segments each with four black spots in a transverse row. Abdominal segments 6 to 8, 
inclusive, with two such spots. A single capitate spine arises from each of these 
spots. Cornicles imperceptible. Cauda pale, short, conical. Beak pale, tip dusky 
gray, reaching first coxae. 
FULL-GROWN MALE PUPA (FIG. 12). 
General color pale brick red; head pale orange. Antennae half as long as the body, 
seven-jointed, pale yellow, with dusky articulations. Eyes bright red. Legs very 
pale, femora usually slightly dusky. Wing pads white. Whole body with four 
longitudinal rows of dark capitate spines distributed as in the oviparous female. 
Cornicles on segment 8, appearing as little rims on the body surface, broader than 
long, concolorous with the body. Cauda bluntly conical, very short, pale yellow. 
Beak pale yellow, extreme tip brown, reaching to the 
first pair of coxae. Measurements: Length of body, 
1.58 mm.; width of body, 0.57 mm.; cauda, 0.045 mm. 
Antenna, joint I, 0.071 mm.; joint II, 0.054 mm.; 
joint III, 0.257 mm.; joint IV, 0.173 mm.; joint V, 
0.200 mm.; joint VI, 0.12 mm.; filament, 0.12 mm. 
Described from several specimens col- 
lected at San Jose, Cal., in 1912. 
WINGED MALE (FIGS. 13; IS, a). 
General color pale lemon-yellow or greenish yellow ; 
head and a median quadrilateral area on thorax dark 
brown; scutellum dark brown; eyes dark red. An- 
tennae not mounted on frontal tubercles, about as long 
as the body ; joints I and II with a dusky central part; 
joints III to VI pale, with their apices dusky gray; 
filament pale; joint III longest, bearing about 24 
small oval sensoria; joints IV and V subequal, both bearing 10 to 15 small sensoria 
arranged along the outer margin; joint VI bearing 4 sensoria, of which the most 
distal is apical; joint VI longer than the filament, the two together scarcely as 
long as joint V. Ocelli distinct. Wings of medium size; costa and insertions 
greenish yellow; stigma short and moderately broad, dusky gray, with a large paler 
central area; veins brown, the third discoidal curving considerably to meet its 
second fork; second fork twice as near to the first fork as to the apex of the wing; 
stigmatic vein obsolete in its middle portion. Legs longer in proportion to the body 
than in the winged viviparous female, pale greenish yellow, with a large dusky area 
near the apex of all six femora; apices of tibiae and tarsi dusky gray. Abdomen 
short, not quite as long as the head and thorax together, widest at the third segment; 
segments 1 to 7, inclusive, with two lateral black spots, one on each side; segments 
1 to 6, inclusive, and segment 8 with two dorsal black spots, one on either side of the 
dorso-median line; the lateral spots on segments 1 to 6, inclusive, are circular or sub- 
circular; the dorsal pairs on these segments are oval; the dorsal spots on segments 6 
and 8 coalesce narrowly in the middle. Cornicles on segment 6, hardly perceptible, 
broader than long. Cauda globular, dusky, half as long as the hind tarsus. Repro- 
FiG. 12, 
Monellia caryx: Male pupa. 
(Original.) 
