124 CHAS. K. BEAIN. 



Key to South African Species oj Sub-Genus Diaspidiotus. 



A. Pygidium of $ without distinct plates. 



a. L 2 rudimentary. 



(1) L x short, not touching on inner margins ; circumgenital glands (fig. 99) 



qfricanus, Marlatt. 

 aa. L 2 normal, smaller than L r 



(2) L x sloping inwards and touching or nearly so ; circumgenital glands present 



(fig. 92) . . . . . . . . . . . . forbesi, Johnson. 



(3) Chitinous thickening to second incision reniform, L t not touching on inner 



margin ; circumgenital glands (fig. 98) . . . . ehretiae, sp. n. 



B. Pygidium of $ with distinct plates. 



b. L 2 normal, smaller than L x . 



(4) Plates short ; circumgenital glands (fig. 97)- . . pemiciosus, Comst. 

 bb. L 2 rudimentary or apparently absent. 



(5) Plates short ; circumgenital glands present (fig. 94) . . pe.ctinatus, Ldgr. 



77. Aspidiotus (Diaspidiotus) forbesi, Johnson (Plate vi, fig. 92). 



Aspidiotus forbesi, Johnson, Ent. News, vii, p. 151, 1896. 



A. (Diaspidiotus) forbesi, Ckll., Bull. 6, U.S. Dept. Agr. pp. 5 & 21, 1897. 



A. (Aspidella) forbesi, Leon., Gen. Spec. Dias. Asp. p. 49, 1900. 



Aspidiotus forbesi, Pernald, Catalogue, p. 259, 1903. 



Common Name : Cherry Scale. 



Scale of adult $ + circular, about 2 mm. in diameter, greenish or brownish grey, 

 with the exuviae orange-red to dark red-brown and slightly covered. 



Male puparium similar in colour, smaller and more elongate. In both cases the 

 margins of the scales are often much paler than the median portions. 



Adult $ yellow, long, pear-shaped, with the pygidial end sharply pointed. Abdo- 

 minal segments distinctly rounded at the margins. L x rounded at apex and notched 

 midway on lateral margin, converging and almost meeting, giving this species a 

 decided pigeon-toed appearance. L 2 narrower, about one-half the width of L 19 

 obscurely pointed, and with an indefinite notch on the the outer edge. The first 

 incision is edged by chitinous thickenings of unequal size, the mesal one being long 

 and club-shaped, the outer one usually minute. There is a small pair of thickenings 

 between the median lobes and the pair bounding the second incision are often of 

 about equal size and fused at the top. Plates absent or inconspicuous. Pygidium 

 as illustrated (fig. 92). Circumgenital glands in 5 groups : 



1—4 



4—7 4—7 



3—5 3—5 



Formula :— L 1; S, L 2 , S, — , S, (1-2P?), — , S. 



This species was probably introduced prior to 1900 on consignments of apple trees 

 from the Southern States of America. 



Habitat : On plum, Bethlehem, O.F.S., 6th April 1912 ; on plum, Potchefstroom, 

 Transvaal, May 1912 ; Cradock, Cape Province ; Pietermaritzburg, Natal. 



Collection No. : 190. 



