loo 
l)r. T. A. ^apnian on CaUo'phrys avis. 
sight was not often wedged into any sort of crevice, differ- 
ing therein much from the egg of C. win, which is almost 
as a rule pushed in between two surfaces, and adheres by 
its top to the upper one, only a little less than by its base. 
The ejig is extremely like that of G. ruhi (Plate XXIII) ; it may 
he a shade larger, 0'7 mm. in diameter, or sometimes rather wider. In 
colour it is like G. ruhi, green, and in some respects nearly white,, 
but on the whole it is less green and has usually a whiter appearance. 
The sculpturing is almost alike. The actual egg is in fact green, but 
the superficial adventitious coating is white, and differs from that in 
G. ruhi in consisting not merely of the columns and ribs, but has 
also a slight laj'^er over the bottom of the cells that seems to be 
wanting in G. rxhi. 
In photographing the micropyles of the two species, Mr. 
Clark found such a difference in the nature of this adven¬ 
titious coating, that he made various prej^arations and quite 
a research to elucidate the differences. He notes that 
“ 0. ruhi has apparently a single coat, which is quite 
transparent when mounted in glycerine (Farrant’s medium), 
and shows the network structure of cells perfectly, either 
in this way or when mounted as a dry object.” On 
the other hand, “ G. avis has apparently two coats, tlie 
outer one bears the sculpture of network, is granular, 
especially under pressure, and separable from the inner 
coat; the latter being transparent and devoid of any 
special structure or trace of cell formation. The sculp¬ 
ture is fairly well seen mounted as a dry specimen, 
whilst in fluid (Farrant’s) it becomes a granular amor¬ 
phous mass.” He also notes that “ the basal portion of 
these eggs is of simple cells ” (i. e. without adventitious 
coat), “ which terminate abruptly when the side of the egg 
is reached.” This is the case in all Lycaenid eggs I have 
examined, though the cellular structure of the base is often 
so faint as to require some looking for. In Calloplirys it is 
very distinct. Mr. Clark also notes that “ the micropylar 
structure is best seen when mounted and pressed quite flat 
in Farrant’s medium. I could detect no ‘ pores ’ as is the 
case in some eggs.” 
The adventitious coat of Lycaenid eggs, as a rule, 
breaks up into an amorphous pulp when treated with 
any medium such as alcohol, benzole, glycerine, etc., 
so that it is useless to try to preserve or observe them 
