OF PSEUDOCOCCIDAE & ERIOCOCCIDAE 131 



PSEUDOCOCCUS Group 



PSEUDOCOCCUS Westwood, 1840 



Pseudococcus obscurus (Essig) 



(Text-figs. 21, 22) 



The winged forms only known ; living specimens not available. The males are narrow 

 and slender, of medium or large size and with comparatively short antennae and moderately 

 long legs. When mounted, the total length of the body 1 106-1470 (1330)11, the width at 

 mesothorax 280-350 (322)0. and the wing expanse 1932-2520 (2240) u.. 



Body setae and pores : Fleshy and hair-like setae present on the body, antennae and legs ; 

 all subequal in length, about 24^ long. Quadrilocular and quinquelocular disc pores about 6[i 

 in diameter, occurring on the head, thorax and abdomen. 



Head : Subtetrahedron ; subtriangular in dorsal and front views ; ventral preocular 

 depression well pronounced in lateral view. Length from apex to postoccipital ridge 125-153 

 (137)". ; from apex to neck 153-192 (i8o)u. ; width across the genae 180-220 (207)^1. Dorsal 

 arm of midcranial ridge anteriorly separated from the other arms by. a short distance, and 

 posteriorly meeting the postoccipital ridge. Ventral and lateral arms forming together a 

 Y-shaped ridge. Postoccipital ridge not reaching the preocular ridges anteriorly. Dorsomedial 

 part of epicranium well sclerotized. Preocular + interocular ridges join the poslocular ridge 

 below the ocellus ; ventral rudiment of preocular ndfi;e hardly indicated. Preoral ridge slender. 

 Eyes : Dorsal simple eyes projecting beyond the outer margins of the head in dorsal view ; 

 their corneae 24-27 (25)11 in diameter and separated by 92-113 (104)11, i.e. 3-8-4-6 (43) times 

 their corneae apart. Ventral simple eyes 27-31 (29) (z in diameter and 24-31 (27) u. apart. 

 Lateral ocelli large. Cranial apophysis apically truncate. Tentorial bridge slender. Dorsal 

 head setae : 5-8 (6-6) f.s. and 7-1 1 (96) h.s. present on each side of the median line anterior 

 to the postoccipital ridge ; each gena with 13-18 (152) fleshy and 3-4 (33) hair-like genal 

 setae. Ventral head setae on each side : 3 4 (33) h.s. between the ventral eyes ; 5-9 (7-1) 

 f.s. and 2-4 (3-2) h.s. forming on both sides a transverse band in the area of the ventral preocular 

 depression ; ventral part of ocular sclerite with 5-1 1 (8-5) fleshy ventral ocular setae ; anteriorly, 

 3 _ 4 (3'3) ns - longitudinally arranged on each side of the ventral arm of the midcranial ridge. 

 Head disc pores : Dorsal head pores 2-3 (22) on each side near the base of the antennae. 



Antennae : Filiform ; normally 10-segmented ; 616-668 (647)11 long, i.e. as long as, or 

 somewhat shorter than half the body length, and slightly shorter than the hind legs, the ratios 

 1 : 2-0-2-2 (21) and 1 : 11-12 (112) respectively. Scape 43-62 (46)11 long and 43-46 (45)11 

 wide at base ; with 6-8 (67) h.s. Pedicel 61-73 (70)11 long and 31-37 (34)11 wide ; with 11-18 

 (14-7) f.s., 9-16 (12-1) h.s., and a sensillum placodeum. Flagelhun : Segment III club-shaped, 

 longest of all and about 24(1 wide ; the ratio lengths of segments III to X 1-4-1-5 (142) : 1, 

 and the ratio width to length of segment III 1 : 3-7-4-6 (4-3). Segments IV to X cylindrical 

 and about 22 u. wide ; the ratio width to length of segment X being 1 : 2-4-2-9 (2-6). The 

 following table shows the lengths of the flagellar segments and the number of setae on each : 



III IV V VI VII VIII IX X 



lengths in (i 



79-98 



6i-73 



6i-73 



58-64 



55-67 



52-67 



52-61 



61-70 



(av.) 



(92) 



(67) 



(67) 



(61) 



(61) 



(58) 



(58) 



(67) 



f.s. 



9-14 



8-i 6 



12-16 



8-16 



11-16 



10-17 



8-14 



10-13 



(av.) 



(n-3) 



(12-4) 



(I4-I) 



(n-7) 



(i3-o) 



(12-9) 



(n-i) 



(107) 



h.s. 



4-7 



2-6 



2-4 



2-5 



2-5 



3-5 



3-8 



5-7 



(av.) 



(5-i) 



(3-5) 



(3-3) 



(2-7) 



(3-i) 



(3-6) 



(5-4) 



(6-3) 



Antennal bristles : Segments VIII and IX each with one ventral bristle ; segment X with 

 3 subapical bristles, a pair of capitate subapical sensory setae, and one apical hair-like seta. 



