LiBURNlA PALLIDULA. 43 



many shades, from white to yellow and to pale brown. 

 The white variety shows the vertex slightly projecting 

 beyond the dark grey eyes. 



Antennae white, with brown tips to the second joints. 

 Pronotum white, with a thin angular mark above the 

 posterior edge of the scntellum. Post-scutellum large, 

 and often marked with an orange spot. Abdomen 

 white and almost immaculate, with two large lamina 

 in the males, which project beyond the abdominal 

 apex. Legs ochreous-yellow. Elytra white, with four 

 coarse greyish nervures, and a dark forked nervure on 

 the clavus. Wings obsolete, and mostly represented 

 by two small membranous lobes. The abdomen in 

 some specimens is stained with orange, and the eyes 

 black. 



The male has the abdomen barred with brown, 

 and the elytra darker. The pygofer is of a complex 

 type, and shows details very like those of L. vittipennis 

 and L. (juttula {vide Plates X. and XII.). The peculiar 

 penis and the funnel-shaped anal process with its 

 styles may be compared with Plate XII., fig. 8. 



Late in September the female contains from three 

 to six eggs. Before oviposition they are green, oval, 

 and placed centrally; with the most mature ovum close 

 to the entrance of the oviduct, and near to the attach- 

 ment of the saws and sheaths, which, when folded 

 together, act as an ovipositor. These ova are very 

 large (0'03 to O'Ol inch), but not so disproportionately 

 so to the abdomen of the insect, as we find in the 

 oviparous female Aphides. The oviducts must be very 

 elastic to allow such large bodies to pass. The point 

 of the ovipositor protrudes from the centre of the 

 funnel, and close to the anal process, with its appro- 

 priate style. 



The variety named iJelphax punctuluni by Kirschbaum 

 shows two black dots on the head and two dots on 

 the gulae or cheeks. The elytra of his insect also are 

 darker in their nervures and membranes than shown 

 by my specimens. 



