MargarodincF. 423 



are modified for a fossorial habit, and the nymphs are enclosed in a 

 firm nacreous test. 



Callipappus has been shown by Fuller {Trans. Eiit. Soc. Lond., 

 1 899, p. 436) to be particularly characterised by an ' intussuscep- 

 tion of several of the abdominal segments of the mature females, 

 in the form of a marsupium, in which the eggs are laid and 

 incubated.' MacGillivray {The Coccidcu, p. 94) erects a separate 

 sub-family for Callipappus on the supposition that the limbs are 

 retained throughout the nymphal stages ; but I have been unable 

 to discover a description of the nymphs of any single species 

 of the genus, Maskell expressly states that he has never met 

 with the earlier stages. Fuller makes no reference to them ; 

 while Westwood describes only the embryonic larva extracted 

 from the body of the mature female. 



The species of the remaining genera have their habitat mostly 

 on the stems of various trees, the nymphal stages being passed 

 either within the tissues of the bark, or in dense waxy cells on 

 the surface. Stomacoccus is exceptional in that the nymphal stage 

 (of the one known species) is completely exposed. 



At present, one genus only {Kiiwania) is known to occur in 

 Ceylon ; but it is highly probable that further search will reveal 

 one or more species of Margarodes, three of which have been 

 described from Southern India. 



Key to Genera of Margarodin/e. 



A. Males with faceted eyes and dorso-abdominal tufts of silky 

 filaments. Females with not more than two digitules on 

 claw. 

 a. Males with branched antennae. Female unknown 



(Neomargarodes.) 

 h. Males with simple antennae. 



a^. Males and females with anterior limbs fossorial 



(Margarodes.) 

 a-. Males and females with anterior limbs normal. 



a^. Abdomen of female invaginated to form a mar- 

 supium (Callipappus.) 



h^. Abdomen of female not invaginated. 



rt*. Tibiae of female with a group of knobbed sctc-e at 

 distal extremity KuWANlA. 



