A sterolecaniune. 313 
The species, so far as known, are all strictly oviparous. 
Habitat : The species of this genus occur exposed on the leaves and bark 
of various plants. No gall-making or concealed forms are known, though 
some few species form depressions in the bark upon which they rest. As 
regards Ceylon, the genus is almost restricted to the Lambuse. Of sixteen 
species recorded from the island, fourteen are found only upon plants of that 
group. 
The preparation of specimens for microscopical examination is attended 
with some difficulty. The extreme delicacy of the derm, in all the species, 
necessitates very careful treatment. It is difficult to extract the insect from its 
covering, and—in practice—it will be found most convenient to boil the un- 
ruptured test in potash. The covering is rapidly dissolved by the alkali, 
leaving the insect free. A deep watch glass is better than a test tube for this 
process, and a comparatively short immersion in the boiling liquid is sufficient. 
Prolonged boiling renders the derm too soft and fragile. I have found that, to 
obtain the best results, the early adult females (before oviposition) should be 
selected. The body will then be fully extended and will display all the parts 
satisfactorily. In older specimens the abdomen is much contracted, and the 
relative position of the parts is confused. Staining is necessary for the proper 
demonstration of the structure. Fuchsin (acid) stains the glands and the more 
densely chitinous parts very clearly. 
Although the various species of this genus are sufficiently well differentiated, 
it is not an easy matter to construct a clear synopsis. The disposition of the 
paired glands affords good characters for the main divisions: but, for some of 
the ultimate distinctions, I have been compelled to fall back upon the form of 
the female test—a not altogether satisfactory system. 
SYNOPSIS OF SPECIES. 
A. With two enlarged paired glands near the posterior 
extremity. 
(a) With supplementary paired glands on dorsum. 
(a!) Dorsal paired glands in a double median 
loneattdinaltSei es esecnsensresteesatseeseersree exteuum, p. 315. 
(6!) Dorsal paired glands in transverse series 72bvocoronatui, p. 310. 
(6) Without supplementary paired glands on 
dorsum. 
(a) Test of female approximately ten times 
lonseithanhbrO2 deneceteascsrcecserseesccceas ZENUtSSLMUM, P. 318. 
(o') Test of female about three times longer 
(HOEIN 1SROBIG! « oncosaacqonoonnsoDanensboRDesoCCosn udagame, Pp. 319. 
B. Without enlarged paired glands at posterior extremity. 
(a) With supplementary paired glands on dorsum. 
(a!) With dorsal paired glands in groups. 
(a) Groups well defined; an inner mar- 
ginal series of paired glands............ aureum, Pp. 320. 
(2?) Groups ill defined ; without inner mar- 
RIAN SETIES- eagaceccoooansanua00coc0 Mescecees flavociliatunt, p. 322 
(41) With dorsal paired glands at Parrsaralls on 
submarginal area ; no caudal setz ...... pudibundum, p. 323. 
