ESSIG. APHIDIDAE OF SOUTHERN CALIFORNIA 



49 



sensoria ; I and II none. III five large circular in a row, IV none, \' one large 

 circular at distal end, VI several small ones in the nail-like process. All but the 

 last articles are scabrous, and there are few hair on any. Pro-thorax with lateral 

 tubercles. Rostrum reaching just beyond the metathoracic coxae. Abdomen 

 more or less distinctly segmented. Cornicles (Figure 34 F) cylindrical and 

 scabrous, length 0.18 mm. Legs moderately long with few hair and no sensoria. 

 Jl'ings hyaline ; primary length 2.3 mm., width 0.95 mm. Cubitus very distinct, 

 as are all the veins. Stigma long and linear. Radius sharply curved. First and 

 second obliques straight, third twice forked. Secondary wing, length 1.55 mm., 

 width 0.6 mm. Sub-costal extends to wing tip, slightly bent at base of second 

 discoidal. First Discoidal arises from the sub-costal one-third its distance from 

 the base. Second Discoidal arises from the sub-costal two-thirds its distance 

 from the base. Style cylindrical, about one-half the length of the cornicles. 

 The pupa is shown in Figure 34 C. 



Figure 35. Callipterus juglandicola. winged female 



Apterous Vivip.\rou.s Fem.xlE. — (Figs. 34 A and B.) Length 1 mm., width 

 0.8 mm. Differs from the winged form in the following respects : Body nearly 

 globular, scarcely segmented at all, dark brown to black. Antennae (Fig. 34 H) 

 considerable longer than the body. 1.22 mm., and without sensoria. The corni- 

 cles of this form are shown in Figure 34 E. 



Nymph of Apterous Viviparous Female. — Resembles the adult only is 

 much smaller and lighter in color. The antennae (Fig 34 G) are five-jointed, 

 the respective lengths are as follows: I 0.93 mm., II 0.95 mm.. Ill 0.12 mm., 

 IV 0.06 mm., V 0.22 mm. The body segmentation is more distinct than in the 

 adult. Rostrum reaches just beyond the meta-thoracic coxae. The cornicles of 

 the nymph are shown in Figure 34 D. 



This, the Orange Aphid, attacks with vigor the tender shoots of the citrus 

 trees. Although in time checked by parasites, it succeeds in doing a great deal 



