48 Thomas Albert Williams 



men above pale green with about three marginal black spots and numerous 

 small dark specks over the surface. Antennae dark, with pale at the articu- 

 lations. Prothorax pale in the middle ; mesothorax and metathorax chiefly 

 brown. Honey tubes black, with some black at their bases, chiefly inside. 

 Tail dusky, with several transverse dusky marks before it. Thorax chiefly 

 dark below, with interspaces about bases of limbs brownish. Under side 

 of abdomen pale green ; two transverse dark marks before the tail. Legs 

 mostly black; tibiae for basal two thirds pale. Length of body 1.80 mm., 

 of antennae 0.70 mm., of honey tubes 0.12 mm. 



Oviparous female: General color dull green, body covered with a glaucous 

 bloom. Above head dusky, prothorax chiefly dusky, the three succeeding 

 segments each with a median transverse dusky blotch ; all segments behind 

 prothorax with a marginal and submarginal series of dusky specks on each 

 side. Below head and prothorax dusky, two dark spots outside the coxa 

 of the middle leg, a dusky line before the coxa of the hind leg, abdominal 

 segments with two series of dusky specks on each side and a pair of spots 

 before the tail. Antennae dusky, the lower part of III and IV paler. Eyes 

 brownish red. Beak dusky. Anterior and middle legs with coxae, femora 

 except bases, tibiae at tips and tarsi except at bases dusky. Posterior 

 leg excepting the extreme base of femur black. Honey tubes black. Tail 

 with black border. Body stout, its greatest width at about the middle. 

 Outline of the front seen from above incurved medially. Antennae with 

 I and II equal in length, I stouter; III about equal to IV and V together, 

 IV and V nearly equal in length and similar in form. Honey tubes short, 

 not swollen in middle. The limbs and tail have the usual pubescence of 

 members of the genus Aphis. Length of body 2.27 mm., width 1.20 mm., 

 antennae 0.80 mm., honey tubes 0.20 mm. 



AERIAL FORM 



Apterous viviparous female: General color pale green, with tail, honey 

 tubes, greater part of beak, antennae and legs black. Head with two broad, 

 approximated, longitudinal bands of dark brown, which give the prevail- 

 ing color. Abdomen with the usual marginal black spots and black patch 

 about the base of the hor.ey tubes. Antennae dark at base and apex. 

 Eyes reddish brown. Anterior legs mostly pale. Beak dark at base and 

 apex. More slender than the female of the root form and of a brighter 

 green color. Honey tubes slightly swollen in the middle. Length of body 

 1.97 mm., width 1 mm., antennae 0.75 mm., honey tubes, 0.17 mm. 



Pupa: Head dark brown, presenting the appearance of two longitudinal 

 dark bands. Body chiefly pale green. Wing-pads, honey tubes and tip 

 of tail black. Antennae chiefly dark. Beak dark at base and tip. Legs 

 nearly all dark, tibiae pale proximally. Length of body 1.60 mm., width 

 0.62 mm., antennae 0.70 mm., honey tubes 0.12 mm. 



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