]9?2.] 



lo 



about its ow-n length from its neiglibour. Tlioy are about 0-8r)mni. long and 

 0'33 mm. wide, and at first are inclined to be bent into a kianey-shape, after- 

 wards are more oval, or at least those I examined had these features, but their 

 outlines may have been altered in the process of extraction. Perhaps the 

 most remarkable point is that the incision of entry is practically indiscoverable, 

 nor could I make sure of the place of exit of the young larvae, the; rapidly 

 growing- young petiole no doubt healing up all traces. 



Tlie larva has many rather long hairs and a skin-sculpture of minute 

 transverse ridges, each about 0'02 or O'OSmm. long; pressed down on slide, 

 one edge appears black, the ridge being more pressed to that side. 



0, 



a 



0, 



EXPLANATION OP FIGURES. 



Sketched diagrammatically under camera. Fig'. 7 enlarged by 6 diameters, 

 all the others by 29. 



Fig-. 1. Egg of Pteronidea curtispina Thorns., recently laid. The surface of the leaf 

 ■where it is laid shows hardly any disturbance or elevation ; the egg at this 

 stage mnst be very thin, but it can be made out easily on close examina- 

 tion. Very soon after laying, probably on egg beginning to thicken, the 

 narrow margin of the pocket that it does not fill appears paler, owing to 

 the entry of air. a, Egg ; b, paler margin of pocket. 



Fig. 2. Pteronidea curtispina — continued. As the egg (a) matures, it increases in 

 size, fills and expands the pocket, first stretching the covering epidermis, 

 diminishing the pale unoccupied area (6), then lifts it, opening the pocket 

 on one margin (that where the saw entered to make it ?), and becomes 

 exposed (c). Towards hatching, half the egg may be exposed in this 

 opening, and the egg, instead of being thin and flat, has made a close 

 approach to being spherical. 



Fjg. 3. Two eggs of Pteronidea hypoxantlius Fiirst. : a, the egg ; b, portion of 

 epiderm of leaf, torn up in remo-ving the egg. 



