Volume III 
APRIL, 1910 
No. 1 
THE ANATOMY OF SIPHONOPHORA ROSA RUM, WALK., 
THE “GREEN-FLY” PEST OF THE ROSE-TREE. 
Part II. The Winged Viviparous Stage compared with 
the Apterous Viviparous Stage. 
By A. J. GROVE, M.Sc., 
Research Scholar, Zoological Laboratory, University of Birmingham. 
(Plates I and II, and two Text-figures.) 
CONTENTS. 
PAGE 
Introduction. 1 
Method . .. . 2 
External Characters ....... 2 
The Wings.4 
The Alimentary Canal. 6 
The Nervous System. 9 
The Sense Organs ....... 11 
The Tracheal System.12 
Summary.13 
Introduction. 
In Part I (1909) of this paper it was intimated that the author 
intended to make a comparison between the anatomy of the apterous 
viviparous form and that of the winged viviparous form. It is clear that 
these two stages are admirably suited to exhibit the structural modifica¬ 
tions which are intimately connected with the habit of flight, for both 
stages being viviparous parthenogenetic females, no differences are 
likely to arise due to different modes of reproduction. Investigation 
shows that the differences are very small; and the points of interest due 
to one stage possessing the power of flight, consist mainly of the 
necessary accommodation for the extensive musculature of the wings, the 
additional nervous supply which the presence of these muscles entails, 
Parasitology in 
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