Aspidiohis. 41 



ASPIDIOTUS TRILOBITIFORMIS, Green. 



(Plate IV.) 



Aspidiotus trilobitifortnis^ Green, ' Catalogue of Coccidae,' Ind. Mus. Notes, 

 Vol. IV. No. I (1896). 



Female puparium large, almost flat ; usually semicircular {Jig. 3) or deltoid 

 from arrest of growth by prominent veins of the leaf, seldom circular, the insect 

 apparently preferring a position close to the midrib of the leaf {fg. l). Colour, 

 pale reddish brown. Pellicles yellow, the second usually depressed. Diameter 

 of puparium, 3 to 4*50 mm. 



Male puparium unknown. 



Adult female {Jigs. 4, 5) clear brown ; surface hard and horny, polished, 

 with numerous delicate transverse striated lines. Form oblong, rounded in 

 front, tapering to a point behind ; dorsal surface flattened ; ventral surface 

 slightly tumid ; segments distinct and strongly defined ; a deep transverse 

 groove on dorsal surface between the prothoracic and mesothoracic segments ; 

 a large irregular depressed space on each side of rostrum, covered with white 

 waxy secretion, marking the position of the parastigmatic glands, of which there 

 is a group consisting of from 12 to 20 orifices in front of each of the anterior 

 stigmata. Pygidium {fig. 6) with eight prominent obscurely tricuspid lobes : 

 mesal pair stoutest, but scarcely as long as second ; others rather slender. 

 Squames deeply fringed ; two in the mesal and first spaces, and three in the 

 second and third spaces between the lobes. Lateral margin of pygidium irregu- 

 larly serratulate with two deep notches marking the position of the obliterated 

 second and third abdominal segments. On the dorsal surface is an extensive 

 reticulated tract completely occupying the median area of the pygidium between 

 the base and the anal aperture, the boundaries well defined and constant, the 

 spaces of irregular size and shape, crowded together, and forming a pattern not 

 unlike that of crocodile leather. Circumgenital glands in four groups ; orifices 

 numerous, upper laterals with 21 to 24, lower laterals with 16 to 27 ; in every 

 case the upper laterals contain the larger number of orifices ; in one specimen 

 were two single separate orifices in the place of an anterior median group. 

 Tubular spinnerets of the filiform type, opening on the dorsal surface by large 

 conspicuous pores arranged in definite linear series ; the ducts themselves very 

 delicate and difficult to trace. Similar pores and spinnerets on the other 

 abdominal segments. Genital aperture between the lower lateral gland groups. 

 Anal aperture about half way between extremity and genital opening. Length 

 I '50-1 '80 mm. Breadth about 4 mm. 



Adult male unknown. 



Egg {fig. 2) pale purplish. 



Habitat on under surface of leaves of Dalbergia Chainpionii, and of an 

 unidentified tree. Punduloya ; (August). 



G 



