Monophlebince. 445 



WALKERIANA FLORIGER, Walk. 

 (Plate CLXXXIV.) 



Coccus floriger. Walk., Cat. Br. Mus. Horn., Vol. IV. Siippl. p. 205 (1858). 

 Walkeriana floriger, Sign., Ann. Soc. Ent. Fr. (5), Vol. V. p. 391 (1875). 

 Coccus laniger, K.\rhy, Jotcrn. Lin. Soc. Loud.., Vol. XXIV. p. 175 (1891). 



Adult female {fig. i) broadly oval, covered above with longish, dense, 

 plush-like tomentum which is concentrated — on the medio-longitudinal area — 

 into close, forwardly directed tufts, with some shorter and broader transverse 

 tufts on the abdomen. The tomentum varies in colour according to age 

 and exposure, and may be whitish, yellow, olivaceous, grey or brown. More 

 or less concealed beneath the tomentous covering are concentric series of 

 white, chalky, lamellar processes, often transversely banded with brown. In the 

 older examples the tomentum becomes dishevelled and matted. Under surface 

 purplish pink, thickly coated with white powdery secretion. Limbs cas- 

 taneous. Antennae i^fig. 3) ten-jointed, the second and tenth elongate, the 

 remainder short ; the distal extremity of each joint with a series of shortish 

 hairs, and a few similar hairs on the sides of the joints. Eyes comparatively 

 small, conical. Legs {fig 4) comparatively small (for the size of the insect) ; 

 the femur (without trochanter) shorter than the tibia ; the tarsus slightly less 

 than half the length of the tibia; claw comparatively slender, with simple 

 digitules (often missing on old examples). There are some longish hairs on 

 the trochanter, and a i&w short spiniform hairs on the femur. The derm 

 of the dorsum is densely covered with slender flask-shaped spines (spiniform 

 setae), those of the ceriferous tracts being smaller and with slightly dilated 

 tips (see fig. 8). The ceriferous tracts are demarked by series of prominent 

 quadnlocular pores, but have few or no pores within the defined areas. The 

 intermediate areas are crowded with similar but much larger quadrilocular 

 pores, in addition to the spines (see fig. 9). The anal orifice is masked by 

 a conspicuous group of long stout seta; set on a somewhat irregular but 

 clearly defined tract {fig. 6) which is densely crowded with small thick- 

 rimmed simple pores. Fig. 7 shows the peculiar structure of the bases of the 

 anal setce and the irregular form of the surrounding pores. The abdominal 

 spiracles (of which I have been able to detect five pairs only) are of simple 

 structure, consisting of a plain ring of dense chitin {fig. 11). The derm of the 

 venter is set with longish stout setae — some of them with collared bases 

 (see fig. 13), intermingled with large and prominent multilocular pores, each 

 pore having an elongate or obscurely 8-shaped central orifice within a ring 

 of (usually) ten bead-like cells, the whole surrounded by a broad chitinous 

 wall. At intervals, along each side of the abdomen, are restricted groups of 

 small quadrilocular pores {fig. 12). There are three sharply defined cicatrices 

 towards the posterior extremity of the venter. A fully grown female, with its 

 covering of tomentum, may attain a length of from 20 to 24 mm., with a 

 breadth of from 18 to 20 mm., but denudation reduces the dimensions of the 

 actual insect by nearly half, an average example measuring 12 by 9 mm. 



