OF THE FAMILY COCCIDAE 



105 



Midcranial ridge dorsally weak and irregular ; ventrally narrow, but well denned, reaching 

 ocular sclerite posteriorly, area surrounding ventral part showing weak polygonal reticulation. 

 Genae large, weakly sclerotized, but showing distinct polygonal reticulation ; each with 16-31 

 (average 23) fleshy and 1-9 (average 4-2) hair-like genal setae. Eyes : two pairs, subequal ; 

 corneae of dorsal eyes 27-34 (average 31) u. in diameter and 1 -7-2-4 (average 1-9) times as much 

 apart ; those of the ventral eyes 27-34 (average 30) y. in diameter and 0-9-1-4 (average 11) 

 times as much apart. Ocellus small. Ocular sclerite well sclerotized dorsally, but weak ven- 

 trally ; polygonally reticulated throughout. Preocular ridges extending only a very short 

 distance below articular process. Postocular ridge well developed throughout ; below ocellus 

 the ridge splits up with the anterior branch partly surrounding the ocellus. Interocular ridge 

 absent. Dorsal ocular setae : 0-6 (average 23) f.s. and 0-2 (average 05) h.s. on each side. 

 Ventral head setae : 70-90 (average 80) f.s. and 4-7 (average 48) h.s., scattered over the ocular 

 sclerite, always with some (4-7, average 48) f.s. occurring in front of this sclerite and with 

 10-15 (average 12) f.s. between and behind the eyes. Preoral ridge present. Tendon-like 

 apodeme long. Cranial apophysis long ; apex deeply bifurcate, extending to around the anterior 

 margin of the ventral eyes. Mouth opening irregular. Anterior tentorial pits absent. 



Antennae 10-segmented, filiform ; 733-828 (average 794) (i long, i.e. shorter than half body 

 length (ratio 1 : 2-08-2-45, average 2 24), shorter than posterior leg (ratio 1 : 0-78-0-81, 

 average o-8o) and longer than penial sheath (ratio 1 : 2-14-2-35, average 2-20). Scape 46-53 

 (average 49) (jl long and 34-46 (average 41) y wide, with 3 h.s. Pedicel with distinct, polygonal, 

 dorsal reticulation ; 53-65 (average 61) u. long and 38-46 (average 43) y. wide ; with 10-15 

 (average 12) f.s., 3-5 (average 4) h.s. and a sensillum placodeum. Segment III somewhat 

 barrel-shaped, 2-1-2-3 (average 22) times longer than wide (57-72, average 64 \i long and 

 23-29, average 26 y wide) ; with 9-19 (average 12) f.s. of medium length, 1 -6-1-8 (average 

 1 -7) times longer than width of segment ; with 1 to 3 usual sensilla basiconica. Segments IV-IX 



i' 



Fig. 37. Pulvinaria acericola (Walsh & Riley), dorsal and ventral view. 



