Williams' "The Aphididae of Nebraska" 7 



a few wingless viviparous and oviparous females. An examina- 

 tion of these slides shows the following characters additional to 

 those given by Williams. 



Wingless viviparous female: The average measurements of the antennal 

 segments are as follows: III, .24 mm; IV, .12 mm; V, .11 mm; VI, base, 

 .07 mm ; VI, filament, .24 mm. The style globular and the anal plate only 

 slightly or not at all lobed. 



Wingless oviparous female: Measurements of antennal segments as fol- 

 lows: III, .24 mm; IV, .14 mm; V, .11 mm; VI, base, .07 mm; VI, fila- 

 ment, .25 mm. No antennal sensoria present except the usual ones at the 

 distal ends of V and VI base. Hind tibiae bearing many small but con- 

 spicuous circular sensoria. 



Winged male: Antennal measurements as follows: III, .39 mm; IV, .23 

 mm; V, .18 mm; VI, base, .085 mm; VI, filament, .25 mm. Segment III 

 bearing 26 sensoria, IV with 17, and V with 10 to 12. Style globular with 

 a lobed anal plate. 



Camera Iticida drawings of the antenna of wingless viviparous 

 female; antenna, cornicle and style of winged male; and hind 

 tibia and cornicle of wingless oviparous female are given on 

 Plate II, figs. 15 to 20. 



29. Ch. quercicola Monell (Ch. spinosus Oestlund). 



" Chaitophorus spinosus Oestl. No. 35. On Quercus macro- 

 carpa, Ashland, May 24, 1890." 



Two winged and several adult wingless viviparous females on 

 slide. This is Monell's quercicola.* 



30. Ch. viminalis Monell. 



31. Callipterus asclepiadis Monell. 



32. Cal. caryae Monell. 

 2^. Cal. discolor Monell. 



34. Cal. punctata Monell. 



Mr. Williams is very probably correct in considering Cal. 

 hyaliniis a synonym of punctata. 



35. Cal. trifolii Monell. 



36. Cal. ulmifolii Monell. 



37. Drepanaphis acerifolii (Thomas) (Drepanosiphum acerif alii Thomas). 



38. Melanoxantherium bicolor (Oestlund). 



* See Jour. Econ. Ento., 3 : 415, Oct., 1910. 



259 



