DIASPIS BOISDTJVALII. 153 



DIASPIS BOISDTJVALII (Signoret). 



(PI. XIII, figs. 810 ; PL XVI, fig. 2; 

 PI. XVIII, figs. 2, 8.) 



Diaspis boisduvalii, Signoret; Essai (1868), p. 114, 



pi. v, figs. 1, 2. 

 Diaspis tentaculatus, Morgan; Ent. Mo. Mag., 1893, 



p. 41. 



Pnparium of adult female approximately circular or 

 ovate, low convex, semi-transparent, revealing the sub- 

 lying female and eggs. This gives it a dull yellow 

 colour and a wax-like appearance. Exuviae towards 

 the centre are pale yellow. Cabinet specimens become 

 more opaque, rougher in texture, and are usually of a 

 pale ochreous or straw colour; and the exuviae of a 

 dusky yellow. Ventral scale a thin mealy secretion 

 upon the food-plant. To the unaided eye the tenanted 

 puparia appear as scales of yellow wax. The loose 

 epidermal layer of certain food-plants is sometimes 

 mixed with the secretion, and thus alters the character 

 of its surface. 



Diam. 1 '25 2*25 mm. 



Adult female (PI. XIII, fig. 9) widely ovate, nar- 

 rowed and slightly extended posteriorly. Thoracic 

 segment with a large projecting marginal tubercle 

 at each side. Free abdominal segments, clearly indi- 

 cated, have a few spines at the margin. Rudimentary 

 antennas with a single curved spine. Rostral filaments 

 usually terminating just beyond the posterior spiracles. 

 Parastigmatic glands present with the anterior spiracles 

 only ; each group numbers about eighteen, they are very 

 small, and broken up into small sub-groups. Dermis 

 with a few minute spinnerets. Spiracles shaped like 

 those of Aspidiotus liederce. 



Pygidium (PI. XVI, fig. 2) with five groups of 

 clearly defined circumgenital glands, varying in 



