64 PULV1NARIA V1TIS, VAE. RIBESI^. 



coccids would produce 25,200 drops of secretion. It is 

 no small wonder, therefore, that the foliage of such 

 coccid-infested plants should speedily become covered 

 with honey- dew. 



The maximum distance to which I found the secretion 

 thrown was 21 mm. (see figs. 2, 3 c in text), and the 

 average diameter of a single drop of the secretion on 

 the paper was '75 mm. Its consistency is like that 

 of good honey, and it spreads very slowly in dry 

 weather, but is apparently more mobile at night. 



Many insects were attracted by the honey-dew, in- 

 cluding Bombus spp., Anthophora pilipes, Apis mellifica, 

 Vespa spp., and many species of Diptera. 



The Non-Polypliagous Habits of the Females. 

 Seeing that P. vitis affects plants belonging to the 

 ViniferaB, Eosacea?, Salicinese, and Betulaceas, the 

 thought occurred to me that possibly the var. ribesiae 

 might be induced to feed upon other plants than 

 Eibes sanguineum, II. nigrum, and R. rubrum. I there- 

 fore transferred a number of ovisacs, each containing 

 .at least 1000 ova, to the following plants : 



RANUNCULACEJE. 



1. Clematis vitalba, L. (5 ovisacs.) 



CUPULIFER^E. 



2. Oak (Quercus robur). (12 ovisacs.) 



BERBEBIDE^E. 



3. Barberry (Berberis vulgaris). (5 ovisacs.) 



LEGUMINOS^E. 



4. Gorse (Ulex europ&us). (5 ovisacs.) 



ROSACES. 



5. Damson (Prunus sp.). (4 ovisacs.) 



6. Pear (Pyrus communis). (15 ovisacs.) 



7. Apple (Pyrus mains). (13 ovisacs.) 



8. Bramble (Rubus fruticosus). (5 ovisacs.) 



