EXPLANATION OF PLATE XXTE 
Siphocoryne padi (Linn.), p. 194. 
[= Siphonaphis avenae (Fabr.), p. 194. | 
Fic. 1.—Variation in wing. 
,  2.—Normal wing. 
»  3-—Abdomen of alate female. 
4.—Antenna of alate female. 
5.—Abdominal end of alate male (after Pergande). 
stalk of cotyledon; s.a. = seed of “ Avena” ; s.s. = surface soil. 
7.—Antenna of apterous female. 
8.—Antenna of five joints. 
Toxoptera graminum (Rond.), p. 196. 
FIG. 9.—Apterous female (dorsal view). 
10.—Apterous female (ventral view). 
II.— Wing. 
12.—Antenna of alate female. 
3) 
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39 
6.—Seedling of “Avena.” a.v.p. = apterous viviparous female; s.c. = 
Bee ree 
