A SYNOPSIS OF THE APHIDIDAE 127 



Head normal, with frontal and antennal tubercles absent. An- 

 tennae short, reaching only to the second abdominal segment. Ill 

 and VI spur subequal ; IV and V subequal and about three-fourths as 

 long as III or VI spur. The usual primary sensoria are present on V 

 and VI, and the accessory sensoria on VI. Secondary sensoria are 

 found on III and IV, from five to nine on the former and from one 

 to four on the latter. Cornicles short, subcylindrical, and tapering 

 from base toward apex. Cauda fairly long, ensiform, with a slight 

 constriction in the middle, the cauda is slightly longer than the hind 

 tarsi, and the cornicles a little longer than the cauda. Lateral tuber- 

 cles are present on the prothorax, and on the first, fourth, and seventh 

 abdominal segments. The cornicles are subequal to IV or V. The 

 hind tarsi are somewhat longer than VI base. The wings are fairly 

 large, with regular venation, the second joint of the third discoidal 

 arising about half way between the tip of the wing and the base of 

 the first joint. 



Measurements: Body length, 1.214 to 1.479 mm. (av. 1.372 mm.) ; 

 width of thorax, 0.476 to 0.578 mm. (av. 0.5338 mm.) ; antennae total, 

 0.733 to 0.918 mm. (av. 0.8925 mm.) ; HI, 0.187 to 0.230 mm. (av. 

 0.2067 mm.) ; IV, 0.136 to 0.161 mm. (av. 0.1473 mm.) ; V, 0.119 to 

 0.153 mm. (av. 0.1416 mm.) ; VI, base 0.085 to 0.102 mm. (av. 0.0877 

 mm.) ; VI, spur 0.204 to 0.230 mm. (av. 0.216 mm.) ; cornicles, 0.127 

 to 0.153 mm. (av. 0.1422 mm.) ; cauda, 0.110 to 0.136 mm. (av. 0.1252 

 mm.) ; hind tarsi, 0.102 to 0.119 mm. (av. 0.1023 mm.) ; wing length, 

 1.921 to 2.397 mm. (av. 2.167 mm.) ; width, 0.799 to 0.935 mm. (av. 

 0.8704 mm.) ; expansion, 4.42 to 5.304 mm. (av. 4.875 mm.). 



Apterous viviparous female. General color green with the follow- 

 ing dusky to black: head, antennae, apex of beak, cornicles, cauda, 

 distal margin anal plate, tarsi, and tips of tibiae. Legs, except tarsi 

 and tips of tibiae, dusky brownish green. Antennae reach to the base 

 of the second abdominal segment. The various segments are propor- 

 tionally the same as in the alates. The beak reaches to the distal 

 margin of the first coxae or almost to the apical margin of the third 

 coxae. Lateral body tubercles are present on the prothorax and first, 

 second, and seventh abdominal segments. Sometimes they are also 

 present on the third, fourth, or fifth abdominal segments as well. The 

 cornicles and cauda are subequal, each slightly longer than the hind 

 tarsi, and of the same form as in the alates. 



Measurements: Body length, 1.326 to 1.462 mm. (av. 1.3685 mm.) ; 

 width of thorax, 0.595 to 0.68 mm. (av. 0.6975 mm.) ; antennae total 



