Volume II 
MAY, 1909 
No. 1 
THE ANATOMY OF SIPHONOPHORA ROSA RUM, WALK., 
THE “GREEN-FLY” PEST OF THE ROSE-TREE. 
Part I. The Apterous Viviparous Stage. 
By A. J. GROVE, M.Sc., Research Scholar , Zoological Laboratory, 
University of Birmingham. 
(Plate I and 15 Text Figures.) 
CONTENTS. 
PAGE 
1. 
Introduction. 
1 
2. 
Methods. 
2 
3. 
External Characters. 
3 
4. 
The Alimentary Canal ..... 
6 
5. 
The Nervous System ...... 
17 
6. 
The Tracheal System . . 
19 
7. 
The Reproductive System. 
23 
8. 
The “ Secundare Dotter”. 
24 
9. 
The Circulatory System. 
25 
10. 
Literature. 
25 
11. 
Reference Lettering. 
26 
12. 
Explanation of Plate ..... 
27 
Introduction. 
When beginning this investigation it was my intention to make a 
comparison between the anatomy of the apterous viviparous form and 
that of the winged viviparous form, to ascertain what differences were 
present corresponding with the difference in habit of the Aphis in these 
two stages. I found, however, that the literature bearing on the group 
to which S. rosarum belongs, was somewhat scanty, and as a rule, rather 
out of date. It therefore became necessary, before undertaking the 
Parasitology ii 1 
