102 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



Material : 10 specimens examined, collected by T. J. Crowe, on Coffea arabica, 

 in Ruiru, Kenya, 25. ix. 1962. 



Remarks : This species, although closely related to P. citri, could be separated 

 by having : the third antennal segment longer than the terminal ; the femur of 

 the middle leg shortest ; a ventral pore, at least on one side of abdominal segment 

 VII ; a comparatively stouter aedeagus. 



Planococcus dioscoreae Williams 

 (Text-figs. 7, 8) 



Only the winged forms known ; living specimens not available. The mounted males narrow 

 and slender, of medium or large size, with short antennae and moderately long legs. The 

 total length of the body 1246-1400 (1330) fx, the width at mesothorax 280-308 (290) [x and the 

 wing span 1960-2128 (2044) u.. 



Body setae and pores : Numerous fleshy and few hair-like setae occur on the antennae and 

 the legs ; the body itself with hair-like setea only. All the setae about 21 [i long. Quadri- 

 locular and few quinquelocular disc pores present on the head, thorax and abdomen, about 

 6[x in diameter. 



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

 depression well pronounced in lateral view. Length from apex to postoccipital ridge 116-122 

 (120) [x ; from apex to neck 168-183 ( I 74)t i '• width across the genae 198-229 (207) ;x. Dorsal 

 arm of midcranial ridge weak, anteriorly detached from the other arms and posteriorly reaching 

 the hindmost level of the dorsal eyes. Ventral and lateral arms of midcranial ridge forming 

 together a Y-shaped ridge. Postoccipital ridge (por) slender, anteriorly continuous with the 

 preocular ridges ; the postoccipital ridge binds the dorsomedial part of epicranium (dmep) 

 posteriorly. Preocular and interocular ridges intimately joined to the postocular ridge ; ventral 

 rudiment of the preocular ridge well marked by a short sclerotization just below the articular 

 process. Preoral ridge slender. Genae large and membranous. Eyes : Dorsal simple eyes 

 not projecting beyond the outer margins of the head in dorsal view ; their corneae 21-27 ( 2 4)( JL 

 in diameter and separated by 98-107 (104) jx, i.e. 39— 46 (4-3) times as much as the corneae 

 apart. Ventral simple eyes slightly larger and much closer, 27-31 (29) y. in diameter and 

 21-27 ( 2 4)[ JL apart. Lateral ocelli comparatively large and dorsally supported by a slender 

 ocellar ridge. Ocular sclerites traversed by the interocular ridges. Cranial apophysis apically 

 truncate. Tentorial bridge slender. Dorsal head setae 8-12 (9-7) on each side of the median 

 line ; each gena with 2-3 (2-7) genal setae. Ventral head setae on each side : 3-4 (3-4) between 

 the ventral eyes ; a group of 9-1 1 (10-4) setae forming with their partners of the other side a 

 transverse band in the area of the ventral preocular depression ; 2-3 (2-4) setae on each side 

 of the ventral arm of the midcranial ridge. Head disc pores : Dorsally, 5-8 (6-4) pores present 

 on each side near the base of the antennal scape ; ventral pores absent. Antennae : Filiform ; 

 normally 10-segmented ; 616-665 (641) n long, i.e. about as long as half the body length and 

 slightly shorter than the hind legs, the ratios being 1 : 2-0-2-1 (2-05) and 1 : i-i respectively. 

 Scape 43-46 (45) (x long and 43-49 (46) y. wide at base ; with 4-7 (5-0) h.s. Pedicel 61-67 (63) y 

 long and 34-37 (35) u. wide at widest ; with 15-21 (18-4) f.s., 5-12 (9-3) h.s., and a distal 

 sensillum placodeum. Flagellum : Segment III club-shaped, being the longest of all, and 

 about 25 [x wide ; the ratio lengths of segments III to X i-i : 1 and the ratio width to length 

 of segment III 1 : 3-6-3-7 (3-65). Segments IV to X cylindrical and about 23(x wide ; 

 segments IV-IX subequal in length, and the terminal segment slightly longer ; the ratio 

 width to length of segment IX 1 : 2-7-2-9 (2-8). 



The following table shows the lengths of the flagellar segments and the number of setae 

 on each : 



