108 Dr. Chapman on some neglected points 
to the case of the Hesperide, that in their three rows of 
hooks show a persistence of Adelid (or at least very low) 
structure, whilst the true butterflies (adult larve) have 
the same structure as the true Macros.* 
The proleg then seems to reach its full development 
with a complete circle of hooklets. A higher develop- 
ment of the insect is accompanied by a fuller develop- 
ment of the inner half of this circle, but by the 
degeneration and disappearance of the outer half. This 
may often be followed out in Macros, where the young 
larva has Pyraloid prolegs, which often suddenly (at 
one moult), or more gradually (in two or three) assume 
in the full-grown larva the unilateral Macro (proper) 
type. 
I think there can be little doubt, since it accords with 
conclusions arrived at on other grounds, that the highest 
Lepidoptera-Heterocera are those that possess unilateral 
prolegs in their first stages. This is the case in (some 
at any rate) Sphinges, Notodonts, &c., and also in 
Nycteolide, recently promoted, but for long kept among 
the Tortrices. They are, however, true Macros, and of 
a high type, probably as high as the Sphinges, but pro- 
bably in no way related to them. The pupe are wholly 
unlike any Micros, and are of strictly Macro type, with 
fifth and sixth abdominal segments free. 
The true Macros thus defined (pupa with only fifth 
and sixth abdominal segments free, adult larva with 
only inner half of proleg furnished with hooks), cor- 
respond precisely with those usually so called, including 
Nycteolide, Nolide, Deltoides, &c., with the exception 
of a group of Micros that have been placed with them 
only on account of their size, and whose relationship 
to each other has been at length recognised by getting 
them all close together, though they are nearly related 
to each other in no other way than that they are all 
Micros (Incomplete). These are the Zygenide, Sesiide, 
Cosside, Zeuzeride, Cochliopodide, and the Psychide, 
if the latter are not already by common consent placed 
with the Tinea. 
The other sections of Obtecte—the Pyraloids—include 
the Pyralids, Phycids, Crambi, Eudoride, and certain 
* Some pup of Hesperide I have seen look as if the 7th was, 
or had recently been, free in the g; but I have seen very few 
altogether. 
