OF THE FAMILY COCCIDAE 41 



F.s. on the legs very slender, making it impossible to distinguish with accuracy between f.s. 

 and h.s. 



Coxae each with 24-35 setae ; fore coxa with 5-8 (average 62) coxal bristles, of which some 

 are capitate ; apical seta about half as long as trochanter. Trochanters 34-44 \i wide ; with 6 

 oval sensilla ; with 16-25 setae, including 2 or 3 minute setae near basal ridge, one small seta 

 on the outer margin and 2 long setae, of which the longest (apical) on the fore trochanter is 

 2-9-3-4 (average 31) times as long as width of trochanter. Femora of medium width (53-67 

 [x), ratio width to length of hind femur being 1 : 4-5-5-1 (average 4-9) ; each with 37-65 setae. 

 Tibiae 29-38 \i wide, ratio width to length of hind tibia being 1 : 141 163 (average 15-1) ; 

 each with 74-121 setae which are about as long as width of tibia ; apical spur of about the same 

 size on all tibiae. Tarsi 28-34 (* wide, hind tarsus 4-1-4-9 (average 4-4) times longer than wide ; 

 each with 18-37 setae ; tarsal digitules subequal, longer than claw. Claws of medium length, 

 about as long as width of tarsus ; slightly curved, with small denticle near tip ; anterior 

 ungual digitule with larger apical knob than posterior one, digitules longer than claw. 



Abdomen 670-810 (average 713) (jl long and 450-600 (average 521) \j. wide. 



Segments I— VI I : tergites and sternites present on all segments ; tergites on segments 11 and 

 111 represented by a small sclerite on each side on the anterior margin, and on the IV— VII by 

 a transverse plate ; sternites represented by .1 weak plate on the anterior and posterior segments 

 and a small sclerite on each side on the intermediate segments. Caudal extension of segment 

 VII small, rounded, not sclerotized. Dorsal setae : f.s. absent ; h.s. absent on segment I, 

 sometimes one or two present on each of the segments 11 VII. Pleural setae consisting of h.s. 

 only, which include d or sopleural setae : 0-3 (average 1 -j), 2-8 (average 3-8), 1-6 (average 35) 

 and 2-6 (average 3-8) on segments III— VI respectively, and ventropleural setae : occasionally 

 one on each of III and IV, and usually one on each of segments V and VI. Segment VII 

 with 6-9 (average 74) h.s. Ventral setae : h.s. only, usually 2 medially on each of II and III, 

 and 4 on each of segments IV-VII. 



Segment VIII with transverse tergite and sternite ; caudal extension forming a small, simple 

 lobe ; glandular pouch with 2 long setae which are sometimes capitate and whose protruding 

 part is about 1 \ times as long as the section within the pouch. No IX tergite observed. Ante- 

 anal setae : 2 long h.s. Posterior margin with 2-4 (average 2-6) h.s. on each side. 



Genital segment. Penial sheath long, about * total body length (ratio 1 : 3-3-3-7, average 

 3-4), 654-809 (average 756) u. long and 49-59 (average 55) U. wide ; lateral sclerotizations not 

 joined anterior to anus ; length of basal rod fj— j{ that of aedeagus, the rod extending anteriorly 

 from base of aedeagus for $ -f of the distance to apex of basal membranous area ; apex of 

 sheath without membranous extension. The area from base of sheath to tip of aedeagus with 

 27-40 (average 35) small setae ; a cluster of small sensilla occurring ventrally near apex of 

 sheath. Aedeagus long (300-376, average 349 \i), penial sheath longer and basisternum shorter, 

 the ratios being 1 : 1-9-2-4 (average 22) and 1 : 0-71-0-96 (average 0-82) respectively. 



Material examined : 10 specimens, bred in the laboratory from material collected 

 by myself on horse-chestnut (Aesculus hippocastanum L.) at the Imperial College 

 Field Station, Silwood Park, Sunninghill, Berks. ; males emerged during May, 

 1962. Five specimens collected by J. Rehacek in Bratislava, Czechoslovakia on 

 14.iv.53 (remounted from Swann's mountant) agreed well with the above description. 



NEMOLECANIUM 



Nemolecanium abietis Borchsenius 



(Text-figs. 4 and 5) 



A long, slender species with comparatively short antennae and legs ; with numerous setae on 

 the appendages, but few on the body itself. When mounted, total body length 1930-2270 



