16 
BULLETIN 964, U. S. DEPARTMENT OF AGRICULTURE. 
FOURTH INSTAR. 
Fig. 14. 
Length 1.21 mm., width of body at widest point 0.44 mm., width of head at widest 
point 0.32 mm. Thorax and abdomen light to dark green, head brownish. Eyes lat- 
eral and prominent, oval shaped, with hexagonal facet structure, color carmine. Beak 
0.56 mm. long, of three joints, terminal joints dark at apex, sucking tube dark brown. 
Antennae tubular, of four joints, the first slightly swollen; amber colored, pubescent, 
hairs somewhat appressed; first joint 0.15 mm. in length, second 0.38 mm., third 0.42 
mm., fourth 0.40 mm., total 1.35 mm. 
Body : Number of joints as in preceding instar. On dorsum of each joint are short, 
sparse, stiff hairs and on the side one short, stiff hair. Body light to dark green, wider 
than head at widest point, and tapering bluntly at posterior end. 
Legs: Straw colored, femur covered with long, sparse hairs; tibia covered with 
numerous short, stiff, appressed hairs; tarsus bearing numerous short, stiff hairs. 
Fig. 14. — Halticus citri: Fourth nymphaliifStar. 
Greatly enlarged. 
Fig. 15.— Halticus citri: Fifth nymphal instar. 
Greatly enlarged. 
FIFTH INSTAR. 
Fig. 15. . 
Length 2 mm., width 0.98 mm. at widest point two-thirds of the way back from 
anterior end, height or depth of head 0.40 mm., widest point of head over the eyes 
0.51 mm. Color of head brownish, of thorax and abdomen pale to dark green. Eyes 
lateral and prominent, oval shaped, with hexagonal facet structure, color carmine. 
Beak 0.95 mm. long, of three joints, terminal joints dark at apex, sucking tube dark 
brown. Antennae tubular, of four joints, amber colored, pubescent, more densely at 
apex, hairs somewhat appressed; first joint 0.19 mm. in length, slightly swollen; 
second 0.64 mm., tubular, slightly enlarged, and brown; third 0.64 mm., tubular, 
slender, pale; fourth 0.56 mm., tubular, slender, tapering acutely; total length 2.03 mm. 
Body: Abdomen with each joint bearing a short, stiff hair. Body dark green with 
dark wing pads, wider than head at widest point and tapering bluntly at posterior end. 
Legs: Femur bearing long, stiff hairs; tibia bearing numerous short, stiff, appressed 
hairs; tarsus bearing numerous short, stiff hairs. 
