| 1895.] The Mouth-Parts of the Lepidoptera. 547 
mandibles, these two species'present a manifestly generalized 
condition of the other mouth-parts. The maxille possess two 
terminal lobes (galea and lacinia of orthopterous and biting 
insects generally), the outer ones, according to Dr. Walter, 
forming together the most primitive rudiments of a proboscis, 
while the inner ones form on each side a groove-like horny 
plate, which affords a lateral support for the labium. The 
lepidopterous proboscis is to be regarded therefore, according 
to Dr. Walter, as derived from the outer lobes (gales) of the 
maxille. In the higher forms the inner lobes (laciniz) are 
reduced. The labium (second maxille) has free outer lobes, 
and a ligula formed by the fusion of the inner lobes into a 
short tubule which is open externally. Dr. Walter detected a 
short hypopharynx on the soft inner or hinder wall of the 
ligula. In M. purpurella and semipurpurella Walter found the 
mandibles to be without denticulations, and the maxille to 
have lost their inner lobes, the outer lobes being applied to 
form a typical sucking proboscis, the short organ being capa- 
ble of being rolled up. The labium in these species is elon- 
gated, has no free outer lobes, and a small hypo-pharynx is 
discernible. . . 
In the brief study which I have been able to make of ‘the 
mouth-parts of Micropteryx the general conditions pointed out 
by Walter are apparent to me. I have examined the mouth 
parts of anderschella, unimacullela, sparmanella, and purpurella. 
In one important point, however, the few observations I have 
made lead me to differ from Walter in his derivation of the 
proboscis. It seems to me that they are the inner lobes of the 
maxilla (lacinie) which go to produce the proboscis, while the 
outer lobes appear as short, hood-shaped processes with chitin- 
ized, firm margins, lying laterad of the base of the lacinia, 
and appearing as protecting or supporting processes for the 
inner lobes. This condition is well presented by unimaculella. 
In the maxilla (see fig. 6, plate XXV) of this species we make out 
a sub-circular cardo (c) a quadrangular stipes (st) from which 
arise the long, 6-segmented palpus (mx. p. x), the short, horny- 
Margined protecting galea (mx. 1, e.), and as innermost pro- 
cess the long lacinia (mx. 1, i.), not fused with its mate 
