Duplicatur. Man kan paa dem adskille et smalt, | round the posterior margin of the above-named du- 
af en Del utydeligt sondrede Led bestaaende Skaft 
og en noget opsvulmet, aflangt tenformig Endedel. 
Denne sidste ender med 3 korte Foleborster og har 
langs sin nedre Side talrige smaa Lugtepapiller, 
ordnede i flere Rekker (se Fig. 3). Enhver af disse 
Lugtepapiller (Fig. 4) viser sig ved sterk Forstor- 
relse at udspringe med en kort og tynd Stilk og 
har det ydre’ Parti skjevt udvidet, dannende en 
stump Vinkel med Stilken. De ender i en stump 
Spids, i hvis indre en liden sterkt lysbrydende 
Blere har sin Plads. 
Andet Par Folere (Tab. XII, Fig. 1 a*, Tab. 
XIII, Fig. 2, a*), der udspringer tet ved Iste Par, 
og lidt lengere udad, er blot tilstede som yderlig 
smaa Rudimenter, der er noget forskjelligt udviklede 
hos forskjellige Individer (se Tab. XII, Fig. 5, 6, 7). 
Talmindelighed danner de hver et smalt, i en tynd 
Spids udgaaende Appendix, paa hvilket undertiden: 
kan adskilles en noget tykkere Basaldel og en ten- 
takelformig Endedel. Hos et Exemplar var Spidsen 
ulige tvekloftet (Fig. 6). 
Af Munddelene er Overleeben og Kindbakkerne 
let bemerkelige, hvorimod de derpaa folgende Dele 
er mere eller mindre fuldstendig skjalte af Over- 
leben, saa at man kun ved Dissection kan faa Rede 
paa deres Bygning. 
Overleben (Tab. XII, Fig. 1, L, Tab. XII, 
Fig. 2, L) udspringer fra Midten af Pandeduplica- 
turen, med hvilken den er bevegeligt forbunden, 
saa at den til en vis Grad kan loftes op fra de 
evrige Munddele. lalmindelighed ligger den dog tet 
ind mod Kindbakkerne, dekkende en storre Del af 
samme (se Tab. XI, Fig. 2). Den er af forholdsvis 
betydelig Storrelse og viser en afrundet firkantet 
Form, med den nedre Flade svagt convex, den ovre 
noget concaveret. Enderanden er svagt udrandet 
i Midten og meget fint cilieret 
Kindbakkerne er meget kraftigt udviklede og 
hos det voxne Dyr uden ethvert Spor af nogen 
Palpe. Deres ydre Del er meget ioinefaldende, naar 
Dyret sees fra Bugsiden (Tab. XI, Fig. 2), og viser 
sig som en paatveers oval Forhoining til hver Side 
af Overleben. Derimod skjules deres indre Del, 
Tyggedelen, ganske af Overleeben og kommer forst 
tilsyne, naar denne bortfjernes eller loftes op (Tab. 
XU, Fig. 1, M). Det ovale, baadformige Corpus (se 
Fig. 8) er med sin ydre, i en Spids udgaaende Ende 
articuleret til Indsiden af Mandibularsegmentet og 
har den indre Hule fyldt med de kraftige Adductor- 
Muskler. Tyggedelen er sterkt, nesten oxeformigt 
udvidet, og delt i 8 kraftige, tvekloftede Tender, 
hvoraf den bagerste eller yderste er den storste og 
ved et storre Mellemrum skilt fra de ovrige, der 
successivt aftager i Storrelse. Den inderste Tand 
plicature. A narrow scape, consisting of some indis- 
tinctly articulated joints may be distinguished, and 
a rather swollen, oblong-fusiform terminal part. 
The latter ends in 3 short sensory bristles, and, 
along its lower side, has numerous small olfactory 
papille, arranged in several rows (see fig. 3). Each 
of these olfactory papille appears, when highly 
magnified, to stand on a thin, short stalk (fig. 4), 
while the distal part is obliquely expanded and 
forms an obtuse angle with the stalk. They end in 
a blunt point, inside which a small, strongly refrac- 
tive yesicle is found. 
The second pair of antenne (PI. XII, fig. 1, a?; 
Pl. XIII, fig. 2, a*), which spring out close to the 
first pair, and a little farther outwards, are only 
present as exceedingly small rudiments, which are 
developed differently in different specimens (see PI. 
XIU, figs. 5,6, 7). They generally each form a thin, 
finely-pointed appendage, in which may sometimes 
be distinguished a thickish basal part, and a ten- 
tacular terminal part. In one specimen, the point 
was unequally bifid (fig. 6). 
Of the oral parts, the labrum and the man- 
dibles are easily distinguished, whereas the succeed- 
ing parts are more or less concealed by the labrum, 
so that any knowledge of their structure is only to 
be obtained by dissection. 
“The labrum (PL XII, fig. 1, L; Pl. XIII, fig. 2, L) 
issues from the middle of the frontal duplicature, 
with which it is movably connected, so that it can, 
to a certain extent, be raised from the other parts. 
It generally, however, lies close in to the mandibles, 
covering the greater part of them (see Pl. XI, fig. 2). 
It is of comparatively large size, and presents a 
rounded quadrilateral shape, with the lower surface 
somewhat convex. The distal edge is slightly emar- 
ginated in the middle, and very finely ciliated. 
The mandibles are very powerfully developed, 
and, in the full-grown animal, possess no trace of 
palpi. Their outer part is very conspicuous in a 
ventral aspect of the animal (Pl. XI, fig. 2), and 
appears as a transverse oval prominence on each 
side of the labrum. Their inner, masticatory part, 
on the other hand, is quite hidden by the labrum, 
and is only visible when the latter is either removed 
or raised (Pl. XII, fig. 1, M). The oval, navicular 
body (see fig. 8) is articulated by its pointed distal 
end to the inside of the mandibular segment, its 
inner cavity being filled by the powerful adductor 
muscles. The masticatory part is greatly, almost 
securiformly expanded, and divided into 8 powerful, 
bifid teeth, the hindmost or outermost of which is 
the largest, and is separated by a greater space 
from the others, which successively decrease in size. 
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