PULVINARIA VITIS, VAK. RIBESLSS. 67 



have been unable to identify the parasite, and have 

 now forwarded examples to Dr. Howard, of Washington, 

 U.S.A. Should he favour me with its name, I shall 

 have pleasure in calling attention to it in the Appendix. 

 At page 40 in the first volume of this work I gave a 

 record of the marsh tit feeding upon this coccid in 

 October, 1901. In 1902 a number of sunflowers 

 ripened in my garden, and the seeds attracted an un- 

 usual number of titmice ; the species present were the 

 great tit (Parus major), the blue tit (P. cseruleus), the 

 marsh tit (P. palusiris), and the cole tit (P. ater). By 

 careful watching, I found that all four species fre- 

 quently visited the colony of Pulvinaria ribesise, and 

 in four days had eaten quite a number of them. A 

 .double thickness of fish-netting was then placed over 

 the tree in order to protect the coccids which were left. 



EXPLANATION OF THE PLATES. 

 FEMALE. 



PL XL VI, fig. 1. Females natural size in situ on 

 branch of Ribes sanguineum, as seen in March 

 after hibernation. 



Fig. 2. Females natural size in situ on R. san- 

 yuineum, as seen early in May. Two examples 

 have commenced the formation of the ovisac. 



Fig. 3. Female insects natural size after the com- 

 pletion of the ovisac. 



Fig. 4. Adult female after treatment with potash 

 (ventral). X 15. 



Fig. 5. Portion of dermis showing large cells and 

 reticulation (dorsal). X 250. 



Fig. 6. Portion of ventral dermis showing minute 

 tubular spinnerets. X 600. 



Fig. 7. Pair of normal eight- join ted antennas from 

 an adult female. X 140. 



Fig. 8. Abnormal seven- jointed antenna of adult 

 female. X 140. 



