30 , ; SCIENCE BULLETIIS, No. 19. 



SUB-FAMILY VU.—Monophlebinae. 

 Tlie females of this group in several genera are active, and move about 

 almost up to the last stage of their development, when they deposit their 

 eggs and die ; others are more stationary after they commence to secrete 

 cottony matter. Some are naked, others covered with a cottony, floury or 

 waxy secretion, some producing large quantities, form a mass of matted 

 filaments behind the female, under which the eggs are laid, and the larvae 

 hatched out. They are popularly known as mealy bugs, and several belonging 

 to the genus Icerya are very serious pests. 



The adult female shows a distinct segmentation with the antennpe, con- 

 sisting of from ten to eleven joints, and the well-developed legs are the same 

 in the three pairs. The anogenital ring without hairs, and the tubercules 

 simple. The males are handsome little two- winged creatures, with large 

 facetted eyes and no ocelli. The antenna? long, clothed with fine long hairs, 

 and the tip of the abdomen often ornamented with woolly or glassy filaments. 

 The active larva? have long legs, and antenna,' covered with fine hairs. About 

 sixteen species included in four genera ; most of the species are peculiar to 

 Australia. . 



