Williams' "The Aphididae of Nebraska" 31 



on the gaurae slide, while the small individual on this slide is 

 very slightly, if any, larger than the other wingless on the gaurae 

 slide. Camera lucida drawings of the head and antenna are given 

 on Plate VI, fig. 96. 



104. M. ? grindeliae (Williams) (Siph. grindeliae Williams). 



" Siphonophora grindeliae n. sp. No. 142. On Grindelia 

 squarrosa, Lincoln, May 8, 1889." 



One winged viviparous female and several immature on the slide. 



Antennal frontal tubercles Rhopalosiphum-Yike. Antenna! segments III 

 and VI, filament, subequal in length, IV less than three fourths of III, V 

 subequal to IV, and VI, base, one fourth the length of VI, filament; seg- 

 ment III with 15 to 19 circular sensoria in a row, V and VI base, with the 

 usual distal ones (one antenna bears two small sensoria on IV, and two on 

 V, exclusive of the usual distal one). Mediai (first branch of the third dis- 

 coidal) branching at a distance a little nearer the point where M3+4 branches 

 than to the tip of the wing. Cornicles swollen near the tip and the*tip also 

 reticulated. 



I am inclined to consider this as belonging to the genus Rho- 

 palosiphum rather than to Macrosiphum. Camera lucida draw- 

 ings of the head, cornicle, and style are given on Plate VI, figs. 

 97 to 99. 



105. M. ludovicianae (Oestlund) (Siph. ludovicianae Oestlund). 



106. M. luteola (Williams) (Siph. luteola Williams). 



Types of this species are preserved in the U. S. National 

 Museum collection and I have had no opportunity of examining 

 them, 



107. M. menthae (Buckton) (Siph. menthae Buckton). 



Mr. Williams quotes from Buckton. No specimens of this 

 species were preserved. 



108. M. muralis (Buckton) (Siph. muralis Buckton). 



" Siphonophora muralis Buckt. No. 146. On Lactuca, Fre- 

 mont, July 31, 1890." 



Three winged, two wingless adults, and one immature on the 

 slide. 



Winged female: Antennae longer than the body; segment III very long, 

 as long as V and VI together; segment III with many (94 to 122) tuber- 



283 



