OF PSEUDOCOCCIDAE & ERIOCOCCIDAE 9 



males. Of these, 5 were collected in England and 4 in Egypt, U.A.R. Among 

 those collected in England were the males of D. alazon, whose pupae were accidentally 

 found on a bunch of bananas, bought in a London fruit shop and imported from the 

 Canary Islands. Two others (Pseudococcus fragilis and P. adonidum) presented the 

 problem of correct identity, which frequently occurs in coccids ; they were found 

 in a mixed colony, and since the identification still depends largely on the females, 

 the actual copulation had to be observed as an evidence to identify the males. 

 Descriptions of these two species are not given here, since they have already been 

 treated in detail by Giliomee (1961) ; his data, however, were included in my tables 

 and used in the discussion. 



Material obtained from colonies. 



Colonies of Pseudococcus obscurus and Planococcus citri on potatoes, and of 

 Chorizococcus lounsburyi on potted bulbs (Amaryllis sp.) were bred in the laboratory. 



It should be noticed that the results of Beardsley's studies (i960, '62, '63, '64, 

 and '65), on a wide variety on pseudococcid species were also utilized, although not 

 entered in the tables due to his different style of description. 



Preparation and technique. 



Theron (1958) introduced a method for mounting the coccid males, in which the 

 specimens were stained by Chlorazol Black E (saturated solution in absolute methyl 

 alcohol). His method was basically followed by Ghauri (1962) and Giliomee (1961 

 and 1967), and also here with slight modifications regarding the clearing (in KOH) 

 and staining length of time. For details of the method adopted and illustration 

 of the tools, see Afifi and Kosztarab (1967). 



The data, in most species, were taken from 10 specimens each. The length of 

 the thorax was taken from the postoccipital ridge to the posterior margin of the 

 mesopostphragma. The length of the prescutum was topographically measured 

 from its anterior margin to the prescutal suture ; the width of the prescutum, and 

 also the lengths and widths of other structures (e.g. scutellum, basisternum) included 

 the boundary ridges. The measurements of the leg segments were taken at their 

 maximum ; the length of the tarsus only indicates the length of the distal tarsomere. 

 The length of the abdomen was taken from the mesopostphragma to the anterior 

 margin of the basal ridge of the penial sheath, or the antero-ventral margin of the 

 genital capsule. 



Part of the material of this study has been deposited in the collections of the 

 British Museum (Nat. Hist.), London, and in the Department of Entomology, 

 Ministry of Agriculture, Cairo, Egypt, U.A.R. 



Illustrations. 



The drawings were made to scale on graph paper, using a square graticule fitted 

 into the microscope eye-piece. The front view of the head was particularly con- 

 sidered, to illustrate the relationship between all arms of the midcranial ridge. 



