1 30 Chionaspis. 



CHIONASPIS PERMUTANS, sp. nov. 

 (Plate XLII.) 



Female puparium {figs. 2, 5, 7) elongate, moderately dilated behind. 

 Ventral scale incomplete, bordering the channel in which the insect lies. 

 Colour pale ochreous, transparent, revealing the form and colour of the insect 

 beneath. Pellicles of same colour. Total length 2*25 mm. Greatest breadth 

 rather less than i mm. 



Male puparium {fig. i?.) snowy white, conspicuously tricarinate, the ridges 

 uneven and undulating. Pellicle bright yellow. 



Adult female elongate ; at first with abdominal segments well marked and 

 fully extended {fig. 4). Colour of early adult pale yellow. During gestation 

 and after oviposition the terminal abdominal segments become retracted 

 {figs. 6, 8), until finally the pygidium is concealed beneath the dorsal parts 

 {fig. 7). In some examples the pygidium is entirely withdrawn into the body 

 {fig. 3). I believe this part can be reti'acted or partially protruded at will. 

 These changes in form are accompanied by equally complete change in colour 

 and texture. The thoracic parts and the first abdominal segment become 

 indurated and of a dark purple brown or blackish colour {figs. 3, 7). The 

 terminal abdominal segments remain pale and flexible to the end. The 

 pygidium is tinged with red. Lateral margins of second and third abdominal 

 segments each with two to four spiniform squames. Parastigmatic glands 

 small and inconspicuous. Pygidium {fig. 9) with moderately prominent lobes. 

 Median pair shorter than first laterals, curved, diverging, finely serrate on inner 

 margin. Second and third lobes duplex, bluntly pointed. In each of these 

 duplex lobes it is noticeable that the mesal one only is accompanied by a 

 thickened inward extension of the body wall. Squames small ; one on each of 

 first to fourth spaces, and two on base. The usual marginal pores. Dorsal 

 pores irregularly distributed over the dorsal surface. Anal and genital apertures 

 at same level. No circumgenital glands. Length of extended insect i'5o to 

 r62 mm. ; after oviposition, i"25 to V40 mm. Breadth o"45 mm. 



Adult male {fig. 10) minute ; bright red, notal plates paler. Antenna about 

 two thirds length of body ; terminal joint with two knobbed hairs at side and 

 one at apex {fig. 11). Foot with four digitules, the second ungual digitule on 

 posterior feet sometimes consisting of a simple pointed hair. Genital sheath 

 as long as abdomen. Total length 0*50 mm. 



Young larvae bright orange. 



Habitat on under surface of leaves of Antidesma bunius. Pundaluoya. 

 Also on unidentified shrub. Kandy. 



The species is attacked by the minute hymenopterous parasite Aphelinus 

 mytilaspidis., Le B. 



To understand the development of this remarkable insect it must be studied 

 in life. The difference between the early adult {fig. 4) and the final si age 



