(. ‘ckxvin’ } 
consequence we find decided modification in the ordinary 
blue scales: in hengis, a species with only the least trace of 
a white area, they are present very sparingly, but the blue 
scales remain of the same type as in apollonius and approxi- 
mately of the same pattern; in hengis however this pattern 
scale covers almost entirely the whole wing, except in the 
costal and terminal areas, the plumules (being so few in 
number) not having affected the general distribution of 
these scales, they merely lie on the surface, and are similar 
in design to those obtaining in apollonius, but are shorter 
and they are also decidedly bluer in colour: the “ blasen- 
schuppen”’ are slightly broader and shorter than in that 
species and have thirteen rows of reticulations, these scales 
are almost as blue as are the ordinary ones, but viewed under 
transmitted white light they are quite colourless, whilst the 
ordinary scales are yellowish. 
In the species of the genus Thysonotis that have no plumules 
there is a decided change in both the pattern of the ordinary 
scales and of the “ blasenschuppen.” Caelius is a good example, 
in it the latter are short and very broad and have as many as 
fourteen rows of reticulations, though thirteen is the usual 
number; they have a broad squarish base and expand some- 
what to their apex which is evenly and slightly arched, the 
scale being broader than long and having a strong attachment 
peduncle; under direct light they are almost colourless, and 
placed as they are (and as is usually the case) in alternate 
layers between the ordinary blue scales, they form a marked 
contrast to the deepish blue of this species; under transmitted 
light they are very slightly yellowish, whereas the ordinary 
blue scale of this insect is deepish lemon colour. The ordinary 
blue scales are likewise different, they differ slightly in length and 
width in the different areas of the wing, but follow in general 
shape those of the genus, being longish, moderately broad, 
tapering slightly wider to the apex, which however is not 
evenly arched but is slightly scalloped, the scalloping being 
very irregular, some being distinctly so, others scarcely 
scalloped at all. 
The deep rich lustrous blue of Hypochrysops rex attracted 
attention, and in this species I found the simplest general 
PROC, ENT. SOC. LOND., v. 1913. 'M 
