DACTYLOP1US LONGISPINUS. 169 



Habitat (under glass). It affects the same kind of 

 plant as D. citri (q. v.), and is equally abundant and 

 destructive. 



Distribution. A common greenhouse pest in tem- 

 perate regions, but occurs in the open air in Southern 

 Europe, Africa, Ceylon, and the West Indies. 



EXPLANATION OF THE PLATE. 



PL LXIV, fig. 12. Adult female (dorsal). X 15. 

 Fig. 13. Antennas of adult female. X 150. 

 Fig. 14. Marginal group of spinnerets and spines 



on abdominal segment of adult female, x 150. 

 Fig. 15. Anal lobe and anal orifice of adult female. 

 X 150. 



DACTYLOPIUS WALKEEI (Newstead). 

 (PL LXV, figs. 1-10.) 



Dactylopius walker i 9 Newstead ; Ent. Mo. Mag., 

 s.s., vol. ii, p. 164, pi. ii, figs. 7, 7 d (1891). 



Adult female (figs. 1, 1 a) very elongate ; pale brown ; 

 antennas and legs paler; covered with a dense white 

 mealy secretion which almost obliterates the segmenta- 

 tion; waxy marginal appendages at the sides, coalesced, 

 forming a very irregular outline ; appendage at 

 cephalic margin occupying the whole width, broad, 

 flat, and slightly reflexed, and sometimes equal to 

 half the length of the entire insect ; median pair of 

 caudal appendages very short, visible only from the 

 ventral surface ; they are composed of a much finer 

 secretion than the rest ; second pair of caudal appen- 

 dages often equalling the length of the body, stout and 

 curved outwards; third pair of caudal appendages usually 

 about one third the length of the median pair. Antennas 



