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X. Some Remarks on Heterogyna penella. By THomas 
ALGERNON CHAPMAN, M.D., F.ES. 
[Read March 16th, 1898.] 
Fleterogyna penella is a moth with an apterous female, and 
a male of the same flimsy black texture as many Psychids. 
But to these it does not appear to be at all related, nor to 
any other group with apterous females. Whether the 
very similar aspect of the males of H. penel/la and some 
Psychids is purely accidental, or whether habits similar in 
some respects are in any way facilitated by their very 
similar facies, that is, whether this black, gauzy texture 
is of advantage to both under like habits, is a question in 
elucidation of which I have not been able to range any 
facts. 
_ Except that it is not of a whitish colour, the female of 
H, penella is more maggot-like than that of most Psychids. 
One of its most obvious differences is that it is coloured 
in almost exactly the same way as the larva, with a char- 
acteristic pattern in black and yellow, and it even happens, 
that a larva pale from a predominance of yellow, or dark 
from the dark markings being more pronounced produces 
a moth varying in precisely the same manner. The female 
moth has even been described as being the same as the 
larva, and superficially it resembles it very exactly. Be- 
sides the essential differences between a larva and an 
imago, it differs in possessing no appendages whatever ; 
not only has it no wings and no legs, but it has no tuber- 
cles, scales, or hairs of any sort, the skin being smooth 
and shining, with some wrinkles due to muscular attach- 
ments and traces of circular marks in the position of the 
larval prolegs. The male moth even has some yellow 
markings on the abdomen that are in the same positions 
as those of the larva, these are actual body markings, the 
hairs being all black; though it is apparently clothed 
sparsely with hairs only, a considerable proportion of 
these, especially on the wings, are really scales, being 
somewhat flattened and striated. 
TRANS. ENT. SOC. LOND. 1898,—PART I. (JUNE.) 
