i 9 6 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



comparatively very small, 37-40 (39) pt long and 31-34 (32) [i. wide, i.e. the ratio 1-2-1-3 ( I-2 3) : *■ 

 and its length to the total length of body 1 : 14-1-17-0 (15-4) ; style rather straight in lateral 

 view, apically rounded. Aedeagus ventrally sclerotized and tapering apically. Setae of genital 

 segment : The genital capsule always with one dorsal and two ventral setae on each side. 



Material : 10 specimens examined, collected by K. Boratynski, on ash trees 

 (Fraxinus excelsior), in the gardens of Buckingham Palace, London, 20.x. 1963. 



Remarks : The mating behaviour of this species was observed in the laboratory. 

 The females, covered with copious waxy secretion, remain fixed usually deep in 

 the crevices of the bark with their heads at the bottom of the crevices and their 

 abdomina directed towards the surface. The male wandering about, somehow 

 is capable of locating the position of the posterior end of the female ready for 

 copulation, pushes its abdomen through the waxy covering and copulation takes 

 place. These observations may suggest that the females remain under their waxy 

 covering until the eggs are fertilized, then migrate to another position to start 

 laying the eggs ; those unmated appear to remain in their positions until they 

 perish. 



KEYS 



The following keys are intended to separate the studied species and their supra- 

 specific categories. Since the significance of some characters is still uncertain, the 

 keys will include as many characters as possible, even more than actually necessary 

 for this purpose. It should be noticed that the numbers of setae and disc pores 

 given in these keys are always on one side only. 



Macropterous Males 



Key to Pseudococcidae and Eriococcidae 



Postoccipital ridge weak, slender, U- or V-shaped. Tentorial bridge comparatively 

 slender. Flagellar segments of the antennae, including the terminal, cylindrical 

 and elongated. Dorsal margin of the proepisternum ridge-like. Scutellum 

 pentagonal in dorsal view ; its length half its width or more ; scutellar ridge absent. 

 Anterior and posterior postalar ridges well separated. Mesopleural ridge inter- 

 rupted above the coxal articulation. Basal part of the trochanter conspicuously 

 longer than the distal. Claw gradually tapering apically ; ungual digitules not 

 knobbed. Dorsal setae of abdominal segment VIII subequal in length to other 

 abdominal setae ; setae of the glandular pouch include a pair of long tail setae and 

 one or more much shorter ones. Basal part of the penial sheath short, not fused 

 with the 9th tergite + 10th segment. Anal opening minute. Aedeagus arising 

 just behind the basal ridges of the penial sheath. Dorsal setae of the genital 

 segment similar to other abdominal setae, always 3 or more. Derm pores present 

 (except in Nairobia bifrons). The puparia fluffy and loosely felted Pseudococcidae (p. 93) 



Postoccipital ridge strongly developed and laterally forked. Tentorial bridge compara- 

 tively stout. Terminal flagellar segments of the antennae barrel-shaped, often as 

 long as wide ; the terminal segement distinctly pear-shaped. Proepisternum with- 

 out any ridge-like sclerotization. Scutellum transverse, rectangular in dorsal view ; 

 its length less than half its width ; with a well developed scutellar ridge on each 



