STKUCTUEE AND BIOLOGY OF SCHIZONEUKA LANIGERA. 659 
forms may be winged viviparous females, apterous viviparous 
females, sexual males and females, with intermediate fonns, 
tlie larvm or ‘^•'lice” and nymphs. 
Text-fig. G. Text-fig. D. 
Text-fig. C. — Sell izoneura laniifera establishing itself in a 
wound caused by a branch being carelessly broken away from an 
apple tree. 
Text-fig. D. — Schizonenra laniger a attacking branch of young 
apple tree (Cox’s orange jiippin), three months after infection. 
(Photograph from experiment tree in the laboratory orchard). 
As illustrating the general life-history of aphids and the 
relation of these different forms in the same species, it would 
perhaps be well to briefly describe the life-history of S. 
lanigera as far as is known at present. 
