12 PESTS OF COFFEE 



sixth together. Text-tig. 1 shows the relations of the 

 various structures described. 



Green's description of the pest is as follows: — 



Lecanium viride, Green." 



Lecanium viride, Green ; Observations on the Green Scale Bug in 

 Connection with the Cultivation of Coffee; Entomologists' Monthly 

 Magazine, p. 248, 1886. 



Adult ? , bright pale green, with an irregular but very distinct 

 loop of blackish spots on the middle of the dorsum. During treatment 

 with potash, the colour changes to dull orange. Dried examples 

 become dull fulvous, and also the chain of dark spots. Eyes conspi- 

 cuous, black, close to margin. Anal scales minute, yellowish. Form 

 oval ; rounded behind, subacuminate in front ; sometimes symme- 

 trical, the development on one side suppressed by contact with a^pro- 

 minent vein of the leaf. Moderately convex above, more particularly 

 in females containing ripe ova. Margin very thin. Skin soft, never 

 strongly chitinized. In old individuals the dorsum is almost smooth ; 

 but before the body becomes tense with eggs, a slight median logitudi- 

 nal, and two transverse ridges are noticeable, the latter above stigmatic 

 areas. Above the abdomen are three series of shallow depressions on 

 each side of median ridge, defined by indistinct transverse and longi- 

 tudinal ridges. Stigmatic clefts small and inconspicuous. Stigmatic 

 spines 3, stout, pointed, the median one twice as long as the others 

 and curved at the extremity. Anal cleft from one-sixth to one-fifth 

 total length. Margin with short curved hairs, the extremities divided 

 into several points, set at rather long intervals ; submarginal tubercles, 

 three or four on each side. Antenna seven-jointed ; third and fourth 

 longest, subequal ; seventh nearly equal to previous two together. 

 Antennal formula, (3,4), (1,2,7), (5,6) or (4, .3), (1,2,7), (5,6), or (3,4), 

 (1,2,7), (5,6) ; sometimes an incomplete division on the fourth joint. 

 Liegs well-developed, moderately stout, claw stout, curved ; ungual 

 digitules broad and spatulate, extending well beyond anal claw ; 

 tarsal digitules long and slender, dilated at extremity, extending beyond 

 ungulae. Scales of anal operculum, triangular ; base shortest, concave ; 

 inner ridge longest, approximately straight ; outer edge slightly shorter 

 than inner, convex. Anal ring with eight hairs, two of them mucii 

 more slender than the remainder. A scattered arch of circular wax 

 glands (with multilocular orifices as in Diaspidinae) enclosing the 

 genital orifice. Derm with large scattered, rather indefinite, round or 

 broadly oval translucent spots. These spots are rather difficult to 

 demonstrate and can only be made out in a good preparation. Length 

 2*50 to 3'25 mm. Breadth' 1'30 to 2 mm. Male unknown in any stage. 

 The species appears to be reproduced, in this country, by an asexual 

 process, (partheno-genesis) alone; though it is quite possible that, in its 

 native country, sexual reproduction may be normal. 



The insect is ovoviviparous, the eggs being hatched at the time 

 of, or immediately after extrusion. Under an adult female a mass of 

 empty egg-skins will be found, with usually some half-dozen or more 



h.'.,: ;: , ' Green, Coccidse of Ceylon, p. 199. 



