io 4 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



Genital segment. Penial sheath of medium length, about \ total body length (ratio i : 4-9- 

 5-3, average 5-1), 365-388 (average 375) |x long and 40-46 (average 44) jx wide ; lateral sclero- 

 tizations narrowly joined anterior to anus ; length of basal rod about equal to 1 \ times that of 

 aedeagus, extending anteriorly from the base of the aedeagus for \ to f of the distance to the 

 apex of the basal membranous area ; apex of sheath with a very small membranous extension. 

 The area from base of sheath to tip of aedeagus with 22-31 (average 25) sensilla ; a cluster of 

 small sensilla occurring ventrally near apex of sheath. Aedeagus short (72 — 82, average 75 |x 

 long), penial sheath and basisternum longer, the ratios being 1 : 4-9-5-3 (average 5) and 

 1 : 2-56-3-08 (average 2-83) respectively. 



Material examined : 7 specimens, collected by D. J. Williams on Salix sp. in 

 Newcastle-on-Tyne, England during 1950. 



In addition 10 specimens, received from Z. Kawecki (collected on Ribes sp. during 

 August, 1962 in Warsaw, Poland) as Pulvinaria Pribesiae Sign., were examined. 



There are no distinct structural differences between the males of these two samples, 

 and the various measurements, ratios and setal counts all overlapped. The descrip- 

 tion given above is based on the specimens from England. The characteristics of 

 the specimens from Poland can be summarized as follows: 



Total body length 1760-2 160 (average 1963 \i). Head : Dorsal head setae 26-51 (average 

 34) f.s. and 5-10 (average 7-9) h.s. ; dorsal ocular setae 0-7 (average 3-6) f.s. and 0-3 (average 

 0-9) h.s. ; ventral head setae 54-108 (average 84) f.s. and 5-7 (average 6-i) h.s. of which 5-9 

 (average 6-6) f.s. occur in the area anterior to the ocular sclerite and 17-25 (average 21) between 

 and behind the ventral eyes ; genal setae 18-30 (average 23) f.s. and 2-9 (average 4-6) h.s. ; 

 antennae 809-999 (average 887) [x long, length in relation to body length 1 : 2-08-2-37 (average 

 2-23). 



Thorax. Medial pronotal setae absent ; post-tergital setae 0-8 (average 2-3) f.s. on each side; 

 prosternal setae 22-50 (average 33) f.s. and 1-3 (average 2-1) h.s. ; median membranous area 

 of scutum 122-141 (average 128) |x long and 205-239 (average 223) |x wide (ratio 1 : 1-62-1-88, 

 average 1-74), with 14-30 (average 21) h.s. ; fleshy postmesospiracular setae 67-84 (average 

 76) ; antemetaspiracular setae 3-9 (average 5-2) f.s. ; dorsospiracular setae 9-19 (average 13) 

 f.s. ; postmetaspiracular setae 16-28 (average 23) f.s. and 0-4 (average 1 -8) h.s. ; anterior 

 and posterior metasternal setae 53-89 (average 79) and 37-54 (average 44) f.s. respectively ; 

 wings 1340-1440 (average 1410) (x long and 610-670 (average 642) ;x wide ; front coxa with 

 2-4 (average 3) knobbed coxal bristles. Abdomen. Pleural setae on segment VII 13-29 

 (average 22) f.s. and 3-8 (average 5-6) h.s. ; fleshy ventral setae on segments II-VII 33-56 

 (average 41), 23-49 (average 35), 18-26 (average 20), 13-27 (average 17) 10-17 (average 14) 

 and 5-16 (average 11) respectively ; penial sheath 353-384 (average 367) [x long, length in 

 relation to body length 1 : 5-15-5-63 (average 5-41) ; aedeagus 72-82 (average 77) jx long. 



Pulvinaria acericola (Walsh & Riley) 

 (Text-figs. 37 and 36) 



A moderately long, robust species with comparatively short antennae and legs ; with 

 numerous setae covering the body and appendages ; wings with a faint purplish tinge between 

 the anterior margin and first wing vein. When mounted, total body length 1670-1890 (average 

 1786) [i. ; width at mesothorax 420-480 (average 458) ;x. Wing expanse 2840-3140 (average 



2978) [X. 



Head subcorneal in dorsal view ; in lateral view obliquely elongated, with anterodorsal bulge 

 pronounced ; length from apex to pronotal ridge 228-293 (average 260) [x, width across genae 

 251-266 (average 257) (x. Median crest sclerotized and distinctly polygonally reticulated ; 

 with numerous (19-43, average 30) fleshy dorsal head setae and 1-7 (average 5-2) hair-like ones. 



