inse;ct note;s for 1912, 433 



Scale of female. It is circular or broadly oval in outline, 

 dark as'hy gray in color with paler margin ; sometimes the scale 

 is nearly white. The exuvia is central or nearly so, dark brown, 

 usually naked and glossy. Diameter 1-8 of an inch. 



"Adult female short ovate, almost circular, old specimens becoming 

 chitinized; yellow or ochreous yellow. Parasitised examples broadly 

 pyriform, inflated, usually bright orange brown, and highly chitinized. 

 Rudimentary antennse a mere stump with a long stiff spine at the base. 

 Rostral filaments scarcely longer than mentum. Free abdominal seg- 

 ments, and margin in front with a few long hairs. Pygidium always 

 with five groups of circumgenital glands, the anterior group consisting 

 of from 5 to 8, the anterior laterals from 7 to 12, the posterior laterals 

 from 5 to 16. The formula of twelve examples from a single colony 

 on plum are given below : 



5 



7 



5 



6 



5 



6 



8—10 



9 — 10 



8-7 



. 7-8 . 



9—9 • 



6-7 



8—10 



9-8 



5-6 



ID — II . 



II— 9 . 



12 — II 



6 



5 



5 



8 



6 



5 



II— 7 



9—10 



7— II 



8—8 . 



12 — 12 . 



9—9 



8—8 



8— II 



16—13 



. 12 — II . 



II — 14 . 



II— 9 



"The subdorsal groups of tubular spinnerets, rather short, are con- 

 nected with a double series of glands or pores. Extending from near 

 the last marginal spine to the base of the pygidium on the dorsum is a 

 series of, usually four, large circular pores. Vaginal opening central. 

 Anal opening about midway between the former and the apex of the 

 pygidium. Margin of pygidium with two pairs of lobes ; median pair 

 well developed, rounded, and notched at the sides; second pair broader 

 than the former, but only about half the length, with the hind margin 

 emarginate, or irregularly notched, forming a wavy outline ; third pair 

 obsolete. The first pair of plates are simple and spinelike ; the second 

 finely serrate; the first two beyond the second lobe simple or bifurcate; 

 the third, usually, deeply and widely serrate. There are usually five 

 long spines on either side^-the first at the base of the anterior margin 

 of the median lobes; the second and third, opposite, are attached to the 

 base of the second lobe-; the fourth and fifth considerably beyond, equi- 

 distant from the second, and somewhat longer. The body-wall is con- 

 siderably thickened and chitinized at the base of the plates. 



"The second-stage female possesses no ventral circumgenital glands ; 

 these organs are not developed until after the final moult. 



"Perfect male varying from ochreous to pale orange yellow. Apodema 

 black, shining. Legs dusky with long sparse hairs. Eyes and ocelli 

 black. Abdomen gradually becoming paler towards the extremity. 

 Antennas of the same colour as the legs, having eight long clubbed hairs 

 on the apical joint." * 



* Newstead, Mongr. British Coccidae T, pp. 100-102. 



