140 



Mr. K. Kuiihi Kannan on 



averaging from 3-3*50 mm., but exceptionally large 

 individuals have readied 5 mm., some examples from 

 myrtle, while showing all the structural characters of the 

 type, were exceptionally small, the adult insect only 

 measuring 2 mm. in length, with a correspondingly small 

 ovisac." 



To these variations have now to be added those of the 

 antennae, which as shown in the drawings are reduced 

 from the normal eight to as low as five (PI. VII, fig. 4). 

 In the same specimen, as in the Javan form, one antenna 

 may vary in one direction the other in another. Here, 

 again, the reduction may be greater than that which has 

 ever been noticed in other species of Pulvinaria, for in 

 psidii it may be by as many as three segments, whereas 

 in other species of the genus it is never greater than by 

 one or two segments. 



These variations reduce the gap between P. psidii and 

 C. viridis. The differences between the two species are 

 tabulated below. 



C. viridis. 



Shape variable, one side straight 

 the other curved, rarely oval. 



Greenish to pale lemon-yellow. 

 Not very variable. Shiny. 



Antennae 7-segmented. 



Ovoviviparous. 



Does not secrete meal. 



Chitin thin, loop therefore 



visible. 

 Dermal cells round. 



P. psidii. 



Shape oval, not variable. 



Colour varies from dark or dirty 

 green to greenish-yellow, very 

 variable. Dull. 



Antennae 8-segmentcd. 



Oviparous. 



Secretes meal to lay eggs in. 



Chitin thick, loop therefore 

 invisible. 



Dermal cells large, irregularly 

 oval, approximate towards the 

 margin, but more or less 

 round towards the centre. 



The distinction between the antennae is of little im- 

 portance in view of the variation in both the species. It has 

 already been shown that antennal segments in Pulvinaria 

 psidii may be reduced to as low as five. As regards mode 

 of reproduction, though no P. psidii has shown any de- 

 parture from ovipary it is not unusual to find beneath 

 green bugs a few developed eggs. The majority of species 

 in the genus Lecanium are oviparous. Therefore it appeals 



