A SYNOPSIS OF THE APHIDIDAE 51 



but was unable to find any specimens, the tree on which it was first 

 found having been cut down. In the following description the color 

 notes are not absolutely accurate, as they were taken from material 

 mounted in balsam. This species is named after its first collector, 

 Mr. E. P. Van Duzee, of the University of California. Type speci- 

 mens are in the collection of the University of California. 



Alate viviparous female. The alate viviparous females are of a dark 

 muddy color, as near as can be judged from the mounted specimens. 

 The antennae are : I and II, dusky ; III and IV, pale with apical half 

 dusky ; V, pale with the apex or apical third dusky ; VI, pale with the 

 apex and spur dusky. The measurements of the segments are : I, 

 0.09 mm.; II, 0.07 mm.; Ill, 0.5 mm.; IV, 0.26 mm.; V, 0.27 mm.; 

 VI, 0.16 mm. The sensoria are located as follows : III, 10-12 ; IV, 

 2-3 ; V, 2-3 ; VI, 1. They are large and circular, and quite evenly 

 distributed in a line on each segment. The beak reaches to the base 

 of the cauda. The coxae are black, the femora amber on the basal 

 half and black on the apical, the tibiae are black with an amber ring 

 near the base, the tarsi are black. The first joint of the hind tarsus 

 is not one-third the length of the sedond, the first measuring 0.08 mm., 

 and the second 0.26 mm. The wings are quite large, with a very 

 distinct stigma. The costal vein is grayish-brown, the subcostal 

 brown. The stigma is long and brown, the stigmal vein being pale 

 brown and slightly curved throughout its entire length. The first 

 and second discoidals are distinct and pale brown, the second dis- 

 coidal being slightly curved near the tip. The third discoidal is indis- 

 tinct and twice-branched, the angles of the branches being very acute. 

 Apterous viviparous female. Prevailing color, amber-brown, with 

 the abdomen mottled gray, brown, and black. The head is brown 

 with anterior margin amber. The antennae are colored as follows: 

 I, amber; II, amber; III, amber with tip dusky; IV, amber with tip 

 dusky ; V, amber with apical two-thirds dusky ; VI, dusky. The beak 

 reaches to the base of the cauda. The femora are brown with the 

 bases amber, the tibiae and tarsi brown. The first joint of the hind 

 tarsus is scarcely more than one-third the length of the second. In 

 four tarsi measured, the relative lengths of the joints were: 0.07 to 

 0.23 mm. ; 0.08 to 0.23 mm. ; 0.08 to 0.28 mm. ; and 0.07 to 0.25 mm. 

 The cornicles are conspicuous and dark, the cauda well rounded and 

 dark on its posterior edge. The lengths of the antennal segments are : 

 I, 0.1 mm. ; II, 0.1 mm. ; III, 0.56 to 0.57 mm. ; IV, 0.21 to 0.23 mm. ; 

 V, 0.22 to 0.28 mm. ; VI, 0.15 to 0.16 mm. 



