EXPLANATION OF PLATE XXI. 
Fic. 1.—Natacoccus serpentinus. Collection of ovisacs, on branch 
of Tamarix articulata; Xabout 2. (From photograph 
by Lt-Col. Stephenson.) 
,, 2.—Natacoccus serpentinus. (a) Diagrammatic view from 
side of adult female ; (0) dorsal view; X 15. 
55 3-—Naiacoccus serpentinus. (a-f) Different forms of anten- 
nae of adult female; X 220. 
