108 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



tions narrowly joined anterior to anus ; length of basal rod equal to about ij times that of 

 aedeagus, extending anteriorly from the base of the aedeagus for ^— § of the distance to the apex 

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

 Area from base of sheath to tip of aedeagus with 24-35 (average 28) small setae ; a cluster of 

 small sensilla occurring ventrally near apex of sheath. Aedeagus short (76-95, average 85 u. 

 long), penial sheath and basisternum longer, the ratios being 1 : 3-6-4-8 (average 4-3) and 

 1 : 2-26-2-95 (average 2-59) respectively. 



Material examined : 9 specimens ; collected by T. E. Tabor on Acer saccharinum 

 L. in Hillsville, Virginia, U.S.A. on 6.V.63 ; received from M. Kosztarab, identified 

 by K. Boratyriski. 



P. acericola can readily be separated from P. Pbetulae by the 2 short antennal 

 bristles on antennal segment X and also by the distinct polygonal reticulation on 

 the pedicel, gena and mesoprescutum. 



PARTHENOLECANIUM 



Parthenolecanium corni (Bouche) 



(Text-figs. 38 and 40) 



A medium-sized and moderately robust species, with comparatively short antennae and long 

 legs ; with numerous setae on the body and appendages. When mounted, total body length 

 1880-21 10 (average 1980) ;x ; width at mesothorax 390-500 (average 446) [i. Wing expanse 

 3030-3400 (average 3283) u.. 



Head subconical in dorsal view ; in lateral view obliquely elongated dorsoventrally, with 

 anterodorsal bulge pronounced ; length from apex to pronotal ridge 239-293 (average 273) (x, 

 width across genae 258-289 (average 275) y.. Median crest sclerotized and distinctly poly- 

 gonally reticulated ; with 23-37 (average 28) fleshy and 16-19 (average 17) hair-like dorsal head 

 setae. Midcranial ridge dorsally absent ; ventrally narrow but well defined, reaching ocular 

 sclerite posteriorly, surrounding area showing distinct polygonal reticulation. Genae large, 

 sclerotized, polygonally reticulated ; each with 17-30 (average 23) fleshy and 7-13 (average 

 9-1) hair-like genal setae. Eyes : two pairs, subequal ; corneae of dorsal eyes 34-42 (average 

 38) ji. in diameter and 1 -2-1 -7 (average 1 -5) times as much apart ; those of the ventral eyes 

 34-42 (average 38) y. in diameter and 0-5-0-8 (average 0-7) times as much apart. Ocellus small. 

 Ocular sclerite well sclerotized and polygonally reticulated throughout. Preocular ridge extend- 

 ing only a short distance below articular process. Postocular ridge usually well developed 

 throughout, usually with a weak anterior branch below ocellus. Interocular ridge absent. 

 Dorsal ocular setae : 1-7 (average 4-1) f.s. and 0-4 (average 2) h.s. on each side. Ventral head 

 setae : 65-83 (average 70) f.s. and 7-12 (average 9) h.s., scattered over the ocular sclerite, 

 occasionally with one or two f.s. occurring in front of the sclerite, and with 12-17 (average 15) 

 f.s. and 0-2 (average 0-7) h.s. between and behind the eyes. Preoral ridge present. Tendon- 

 like apodeme long. Cranial apophysis of medium length ; apex bifurcate, without central bulge, 

 not reaching the level of anterior margin of ventral eyes. Mouth opening irregular. Anterior 

 tentorial pits apparently absent. 



Antennae 10-segmented, filiform ; 825-998 (average 895) jx long, i.e. shorter than half body 

 length (ratio 1 : 2-06-2-41, average 2-23), shorter than posterior leg (ratio 1 : 0-77-0-89, average 

 0-82) and longer than penial sheath (ratio 1 : i*89-2-io, average 1-95). Scape 49-61 (average 

 55) \l long and 42-53 (average 48) \i wide, with 3 h.s. Pedicel with distinct, polygonal, dorsal 

 reticulation ; 61-68 (average 64) \i long and 42-49 (average 46) u. wide ; with 7-1 1 (average 

 9-3) f.s., 5-8 (average 6) h.s. and a sensillum placodeum. Segment III club-shaped, 2-1-2-4 

 (average 2-3) times longer than wide (61-84, average 66 u. long and 27-34, average 28 jx wide) ; 



