206 CHAS. K. BRAIN. 



alive, and the plates simply or feebly branched. In some cases there are clubbed 

 thickenings running back from the lobes, somewhat similar to those in Howardia. 



As constituted at present this genus is entirely unsatisfactory, as it contains insects 

 which are apparently not closely related. Thus, if trilobitiformis with fringed plates 

 (fig. 126) be taken as typical, the native South African species are distinct by the 

 absence of such, or else by the presence of simple plates. The character of the scale 

 is different, and the Hoivardia-like paraphyses found in some species are unusual 

 and point to a burrowing habit in the female stage, Circumgenital glands may be 

 present or absent. 



Key to South African Species of Pseudaonidia. 



A. Pygidium with long, clubbed paraphyses. 



(1) Scale large, flat, slightly obscured by outer layers of host- plant ; pygidium 



with three pairs of paraphyses (fig. 123) . . P. tesserata, d'Emmerez. 



(2) Scale large, convex, covered by outer layers of host-plant ; pygidium with 



two strong pairs of clubbed paraphyses (fig. 125) . . P. clavigera, Ckll. 



(3) Scale of adult $ black, capsular, covered by bark of host-plant ; anal opening 



covered by large forked flap (fig. 128) . . . . P. laciniae, sp. n. 



(4) Adult $ small, densely chitinous, with two large clear areas ; pjrgidial margin 



crenulate (fig. 122) . . . . . . . . . . P. glandidosa (Newst). 



(5) Scale of adult $ large, black, blister-like ; L 2 narrower than L x or L 3 ; pygidium 



with four pairs of clubbed paraphyses (fig. 127) . . . . P. nigra, sp. n. 



B. Pygidium without distinct paraphyses. 



(6) Scale of adult $ large, flat, brown ; plates forked ; circumgenital glands 



present (fig. 126) . . . . . . . . - P. trilobitiformis, Green. 



(7) Scale of adult $ about 1'6 mm. diam., buff, moderately convex ; plates simple, 



dagger-shaped ; circumgenital glands absent (fig. 124) P. lycii, sp. n. 



104. Pseudaonidia tesserata (d'Emmerez) (Plate xii, fig. 123). 



Aspidiolus (Diasjndiotus) tesseraius, d'Emmerez, Pr. Soc. Amic. Scien., p. 23, 1899. 



Aspidiotus (Pseudaonidia,) tesseratus, Lefroy, West Indian Bull., iii, p. 247, 1902. 



Scale of adult $ large (may reach 3 '5 mm. in diameter), circular, flatly conical, 

 completely covered by the outer flaky layers of bark, but with the central, small, 

 brown exuviae showing through. The scale, with the bark removed, is dull red- 

 brown, with a roughened surface. It is + capsular, with a dense brown ventral 

 scale. The interior is covered with a thin layer of white powdery wax, which is 

 quite conspicuous when the dorsal scale is flaked off. 



The adult $ is large, about 1"7 mm. long and 1*2 mm. broad, Selenaspidus-Vikt 

 in form, with a distinct articulation between the cephalothorax and abdomen, but 

 there is no spur on the lateral margin. The integument becomes very densely 

 chitinous at maturity, in which stage most of the pygidial characters are + obscured. 

 The following particulars, therefore, are given from an adult $ prior to the stage 

 of extreme chitinisation. The abdominal segments are distinctly indicated in the 

 middle of the body but not at the margin. There are three well-defined regions at 

 the margin ; the cephalothorax, separated by a broad V-shaped indentation ; the . 

 abdominal region ; and less distinctly separated from the latter, the pygidium proper. 



ML 



