in the pupé of Heterocerous Lepidoptera. 108 
the prothoracic case. The prothorax is dorsally so de- 
generate a structure in Lepidoptera that the same divi- 
sions in it, as inthe meso- and meta-thorax, cannot be 
made out in the imago, and in the obtected pupa it is 
covered by one plate, divided into two lateral portions. 
But in the Incomplete (Micro) there is a very narrow 
plate, best seen after dehiscence, between this portion 
and the head, and it is with this plate that the glazed 
eyes are connected. If with this knowledge in hand 
one examines a Macro (obtected) pupa, not too near 
to the period of emergence, we find that from the sur- 
face line dividing the glazed from the true eye, a very 
strong dissepiment descends, showing here also that the 
two portions, though so closely and constantly asso- 
ciated, belong to quite different sections of the insect. 
Tam not, of course, prepared to assert that this anterior 
portion of the prothorax may not have some less simple 
relationships, and may not be found to throw some light 
on the question, that is often suggested by the larva, 
whether the anterior portion of the second segment, 
which is dorsally a double one, does not ventrally con- 
tribute to supply portions of the head.* 
The nature of the incomplete (Micro) pupa may be 
further illustrated by the way in which the long antenne 
of Adela and Gracilaria, and some others, when they 
project beyond the other appendages, each remains 
separate and free to its extremity, and the same occurs 
as to the posterior legs in some cases; whilst in Macros 
(Obtecté) long antenne are carried carefully round the 
margin of the wing (N. cilialis, D. applana), or a long 
proboscis is doubled up in a projection (Sphinz, 
Cucullia), and go on. 
Among the other characters that distinguish the 
Micro pupa is one which is closely associated with the - 
semi-incomplete nature, that is, the mobility of the 
* Mr. Poulton has most kindly shown me certain drawings, 
which, with some observations they suggest, appear to prove that 
the inner semilunar portion of the glazed eye is the true eye both 
of larva, pupa, and imago, and on such a point Mr. Poulton’s 
authority 1s unquestionable. What I have regarded as part of the 
dorsal prothorax would therefore prove to be really part of the 
head. In any case, what I am just now most concerned to show, 
viz., that there is a remarkable difference here, in structure and 
dehiscence, between the obtected and incomplete pupa, remains 
unatfected.—T, A, C, 
