20 John June Davis 



Wingless viviparous female: Antennal segment III with 7 to ii irregu- 

 larly placed, circular sensoria (usually on distal half of the segment) ; 

 segment IV with 7 to 10 sensoria; and V with 2, not including the usual 

 distal one. Relative lengths of antennal segments approximately the same 

 as in winged individuals. Lateral thoracic tubercles present. Cornicles 

 and style as in winged. Length of body, 1.75 mm; width, 1.05 mm. 



Camera lucida drawing of the antenna is shown in Plate IV, 



% 75- 



71. A. setariae (Thomas). 



yz. A. solidaginifoliae Williams. 



" Aphis solidaginifoliae n. sp. No. 91. On Solidago, Piatt R., 

 Ashland, Sep. 20, 1890." 



Many wingless oviparous females on slide, all of which are 

 rather obscure. Some specimens bear 4 to 5 circular sensoria on 

 antennal segment III, and i to 2 on segment IV, while these two 

 segments are bare of sensoria in other specimens. Hind tibiae 

 swollen and bearing numerous small sensoria. Other characters 

 as given in the original description. Camera lucida drawings of 

 the antenna, hind tibia, cornicle and style drawn from specimens 

 on this slide are shown on Plate IV, figs. 76 to 79. 



Another slide labeled as the one mentioned above but numbered 

 " 92 " is also examined. It contains a number of oviparous 

 females and one specimen which may be a viviparous female. 

 This latter individual dififers from the others by not having the 

 hind tibiae swollen and not bearing sensoria. There are 12 to 15 

 irregularly placed sensoria on III, 8 to 11 on IV, and i, not in- 

 cluding the usual distal one, on V. The body appears to have 

 either an egg or an embryo within it. Antennal measurements as 

 follows : 



Length of body, 1.65 mm; of cornicles, 0.14 mm. 



The oviparous females on this last slide have from i to 4 

 sensoria on III, and i or 2 on IV. Average antennal lengths as 

 follows: III, 0.147-0.165; IV, .0.095-0.104; V, 0.095-0.104; VI, 



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