262 Pulvinaria. 
PULVINARIA CELLULOSA, sp. xov. 
(PLATE XCIX.) 
Adult female (gs. 1,2, 4) oblong oval, stigmatic indentations not conspicuously 
defined. Before gestation moderately convex above, with a more or less well 
marked median carina (fg. 2). Colour pale olivaceous above, the dorsum 
minutely and closely studded with brown dots, so that—to the naked eye—the 
insects appear dark brown or even black (fg. 1). On microscopical examin- 
ation, the brown spets prove to be pigmented dermal cells (fg. 3), which are 
large and crowded, especially on the median area, where they are practically 
contiguous. The extreme margin is unspotted. Dried examples lose the 
pigmentation and assume a dull, fulvous tint. Ventral surface olivaceous at 
margin, the median area bright green. Eyes conspicuous, black, submarginal. 
After gestation the insect becomes shrivelled anc elevated behind, resting on 
the snowy white ovisac (jg. 4). It loses most of the brown spots and appears 
of a uniform olivaceous or greenish tint. Ovisac with a conspicuous median 
or longitudinal furrow. Antenne (fg. 6) eight-jointed ; the third and fourth 
approximately equal, longest ; seventh shortest ; formula: (3, 4), (2, 8), I, 5, 6,7. 
Legs well developed, stout ; tarsus more than half length of tibia ; foot (jzg. 7) 
with stout curved claw, ungual digitules broadly dilated. Margin (fg. 5) with 
what at first sight appear to be simple pointed hairs, but, on closer examination, 
many of them are seen to be frayed at the extremity (fg. 10), but scarcely 
dilated. As the frayed edge is usually vertical, this character can easily escape 
observation. Stigmatic cleft shallow, with from four to six stout spines, one of 
the series being about three times the length of the others. Valves of anal 
operculum (7g. 8) broad, the base rather shorter than the outer edge. Length 
of insect averaging 3°50 mm. Total length, with ovisac, 4°50 to 5 mm. 
Neither adult male nor male puparium observed. 
Immature female similar to adult, but smaller ; the spots rather more widely 
separate ; usually with a distinct dark median longitudinal stripe. 
On Cétrus. Pundaluoya. March. 
After the formation of the ovisac, the insect may be readily mistaken for 
P. psidiz ; but can be distinguished microscopically by the form of the marginal 
hairs and by the more conspicuous and crowded dermal cells. Before gestation 
the insects resemble the early stages of Lecanium nigrum. 
