282 MEMOIBS OF THE QUEENSLAND MUSEUM. 



REMARKS ON THE ILLUSTRATIONS. 



(Plates XVII and XVIII.) 



Pectinariojjhijes jyecfinaria Kirk.^ — Figs. 1, 2, 3, and the upper insect in fig. 4. 

 Polychcetophyes serpuJidia Kirk. — Figs. 5, 6, 7, 8, and the lower insect in fig. 4. 

 Figs. 1 and 5 show the first appearance of the nymphs of both species, while forcing 

 their way, posterior ends first, out of their tubes. The next stage is shown at fig. 6, 

 where the nymph is clinging to the twig, while its skin is about to split longitudinally 

 up the back. In figs. 2 and 7, the upper portion of the insects are free, while they 

 are supported, by their lower parts which are still enclosed in the nymphal skins ; 

 the wings are seen beginning to develop. Figs. 3 and 8 show the fully developed 

 insects resting in their characteristic positions. In fig. 8, a circular anal plate can be 

 seen on the empty nymph skin ; it is peculiar to this species, and is used by the 

 nymph as an operculum to close the mouth of its tube. 



