EXPLANATION OF PLATE LV. 



LECANIUM PERFOBATUM. (Page 121.) 



Fig. 1. Insects natural size in situ on underside of 

 leaf of Wallichia densiflora. 



Fig. 2. Young adult female. X 10. 



Fig. 3. Adult female showing tesselation as seen 

 by transmitted light. X 10. 



Fig. 4. Marginal plates with eye in clear fusiform 

 space at a. x 40. 



Fig. 5. One of the posterior submarginal plates 

 with large subcentral gland-like perforation, and 

 smaller perforations at margins. X 40. 



Figs. 6, 6 a. Antennae of adult female, x 140. 



Fig. 7. Terminal joint of same. X 300. 



Fig. 8. Leg of the adult female. X 140. 



Fig. 9. Anal lobes (closed), x 40. 



Fig. 10. Anal ring and surrounding organs (ven- 

 tral) : a, base of anal ring ; b, chitinised lever, 

 probably used for opening and closing anal lobes ; 

 c, spine bearing tubercles ; d, upper portion of 

 anal cleft ; <?, dotted line indicating the position of 

 the anal lobes ; /, ventral spinnerets. X 140. 



Fig. 11. Anal ring and surrounding organs (dorsal) 

 with the anal lobes and ring thrown backwards 

 and upwards by pressure of the covering glass. 

 The letters a-e apply to the same parts as those 

 in fig. 10. x 140. 



