A SYNOPSIS OF THE APHIDIDAE 83 



as the body. The relative lengths of the segments are as follows: the 

 spur is the longest, being followed by III, which is subequal but never 

 longer. IV is about one-half the length of the spur and slightly longer 

 than V. II is slightly longer than VI, which is about equal to I. 

 Sensoria are arranged as follows (figs. 279-281) : on V and VI are 

 the usual primary and accessory sensoria; on V in addition to the 

 primary sensoria, there are at times as many as seven small circular 

 secondary sensoria, located about the middle of the segment. The 

 number of these sensoria range from none to seven, two and three 

 being the usual number ; on IV there are from six to twelve irregular 

 secondary sensoria (fig. 280), placed irregularly along the whole 

 length of the segment ; on III there are between thirty and forty 

 irregularly placed and irregularly sized sensoria (fig. 279) scattered 

 along the whole length of the segment. The usual number is from 

 thirty-six to thirty-nine. The prothorax is without lateral tubercles. 

 The beak is of medium length, reaching to slightly beyond the second 

 coxae. The cornicles (fig. 282) are fairly large and clavate on one 

 side. At the widest point they are slightly less than one-fifth the 

 length. The tip is slightly wider than the base. They are about the 

 same length as the fourth antennal segment, although in some cases 

 they may be slightly longer, and in others slightly shorter, but in all 

 cases longer than the fifth antennal segment. The cauda (fig. 283) is 

 long and fairly large, not quite reaching to the tip of the cornicles, 

 being about one-half as long as the cornicles and one-half as long 

 again as the hind tarsi. The- wings and venation are normal, the 

 forewings being about twice as long as the body. 



Measurements : Body length, 1.48 to 1.87 mm. ; width, 0.73 to 0.82 

 mm. ; antennae total, 2.35 to 2.51 mm. ; III, 0.544 to 0.697 mm. ; IV, 

 0.306 to 0.425 mm. ; V, 0.218 to 0.357 mm. ; VI, 0.085 to 0.119 mm. ; 

 spur, 0.68 to 0.799 mm. ; cornicles, 0.323 to 0.459 mm. ; cauda, 0.187 to 

 0.255 mm. ; hind tarsi, 0.136 to 0.153 mm. ; wing length, 3.4 to 3.8 mm. ; 

 wing width, 1.2 to 1.5 mm. ; wing expansion, 8.0 to 8.3 mm. The 

 average measurements are as follows : body length, 1.74 mm. ; width, 

 0.768 mm. ; antennae total, 2.445 mm. ; III, 0.645 mm. ; IV, 0.382 mm. ; 

 V, 0.328 mm. ; VI, 0.107 mm. ; spur, 0.753 mm. ; cornicles, 0.403 mm. ; 

 cauda, 0.248 mm. ; hind tarsi, 0.139 mm. ; wing length, 3.6 mm. ; width, 

 1.32 mm. ; expansion, 8.1. 



Apterous viviparous female. Prevailing color pale green with the 

 head paler, being almost luteous or of a pale yellowish green color. 

 The eyes are red. The antennae, except the apices of segments three 



