Williaiiis' "The Aphididae of Nebraska" 17 



One wing with once branched media (third discoidal), the other wing 

 with normal venation. 



Camera lucida drawings of the antenna, wing, cornicle and 

 style of the winged viviparous female are given on Plates III and 

 IV, figs. 59-62. I am unable to separate this species, which 

 Williams has called inalvae, from A. gossypii. 



60. A. medicaginis Koch. 



61. A. middletoni Thomas. 



Williams' description of the wangless form is quoted from 

 Oestlund. No specimens of this species seem to have been pre- 

 served. 



62. A. mimuli Oestlund. 



63. A. oenotherae Oestlund. 



64. A. folsomii Davis (A. parthenocissi Williams). 



"Aphis parthenocissi n. sp. No. 81. On Parthenocissus 5- 

 folius, Lincoln, Aug. 7, 1890." 



Several wingless viviparous females on the slide. This is the 

 same as A. folsomii described by the writer in Entomological 

 Nezvs, 19 : 143, April, 1908. 



65. A. pentstemonis Williams. 



" Aphis pentstemonis n. sp. No. 83. Penstemon glaber, War 

 Bonnet C, 6/23, '90." 



Four winged on this slide, three of which are viviparous and 

 the other either a male or a different species. 



Winged viviparous female: Antennae not reaching to base of cornicles; 

 26 to 34 irregularly placed, moderately tuberculate, circular sensoria on 

 segment III, and the usual ones at the ends of V and base VI. A small 

 but conspicuous tubercle on each side of what appears to be the second 

 abdominal segment and also a similar one on each side of the segment just 

 posterior to the cornicles. The thoracic tubercles are also prominent. Usu- 

 ally Ml (first branch of the third discoidal) branching at a distance a little 

 nearer the tip of the wing than to where .1/3+4 branches, but occasionally 

 it branches midway. Measurements of the three visible antennae as fol- 

 lows: 



269 



