Lecaniodiaspis. 297 
LECANIODIASPIS, Targioni-Tozzettz. 
Lecaniodiaspis, Targ., Bull. Soc. Ent. Ital., p. 261 (1869). 
Prosopophora, Dougl., Ent. Mo. Mag., p. 207 (1892). 
Birchippia, Green, Ann. Mag. Nat. Hist. (7), Vol. V1. p. 450 (1900). 
Adult female enclosed in a compact tough opaque test, which subsequently 
forms a receptacle for the ova. Surface usually with longitudinal and transverse 
ridges enclosing depressed areolz. Occasionally with waxy processes on the 
dorsum. A small oval aperture, near the posterior extremity, through which 
the larvee make their escape. Varying in convexity from flat to almost hemi- 
spherical. In some species the insect rests in a shallow pit or depression in the 
bark of the plant. 
Adult female insect either apodous or with extremely rudimentary limbs. 
Antennz usually well developed, of from four (acacz@) to nine (savdoa) joints. 
Mentum monomerous. Anal segment more or less cleft ; the base and inner 
sides of the cleft guarded ventrally by a bilobed chitinous thickening of the 
derm which simulates the anal lobes of the Lecanzzn@. A transverse median 
plate with emarginate outer edge, forming the dorsal lip of the anal aperture. 
Anal ring with from eight to twelve stout flattened hairs. A pair of stout sete, 
one on each side of the anal cleft. Stigmatic spines always present ; usually 
one or two on the margin opposite each spiracle, and occasionally at a point 
midway between them. Derm with paired (8-shaped) glands in greater or less 
abundance. On the dorsal surface of the abdomen are two series of circular 
chitinous plates bearing translucent pits or pores. These have been termed 
‘cribriform plates,’ from a fanciful resemblance to a sieve. Their function is 
obscure. 
Male puparium of similar texture to that of female ; but smaller and narrow 
oblong ; with a large circular operculum above the posterior extremity. 
Examples of the genus are widely distributed throughout both hemispheres. 
Two species occur in Ceylon. 
SYNOPSIS OF CEYLON SPECIES. 
A. Test of female only slightly convex; resting in a 
shallow depression in the bark of the plant, with- 
out waxy processes. Dorsum of adult female insect 
with numerous stout conical spines .................00+8 azadirachte, p. 298. 
B. Test of female strongly convex: bearing five longi- 
tudinal series of white waxy-pointed processes. 
Adult female insect without spines on dorsum .., *alaéoda, p. 300. 
