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131
Grændsen mellem begge disse Partier er hos nærværende
Form skarpere markeret end bos de øvrige Arter af Slægten,
idet en tydelig bemærkelig Indknibning skiller begge ad.
Integumenterne er meget tynde og gjennemsigtige
samt uden nogen udpræget Structur.
Hovedet er stort og bredt, oventil jevnt hvælvet og
til liver Side udrandet for Insertionen af Folerne. T Midten
stiger Panden skraat nedad mellem Roden af lste Par
Følere, uden at danne nogen tydelig Frontalproces, og
forbinder sig her med det halvmaaneformige noget
fremspringende Epistom (se Fig. 4).
lste Forkropssegment er kun lidet bredere end
Hovedet og kun forsynet med smaa og lidet fremspringende
Epimerer. De 3 følgende Segmenter er derimod bredere
og har Epimererne mere pladeformige og jevnt afrundede.
Alle disse 4 Segmenter er oventil paatværs udhulede, idet
saavel den forreste som bagerste Rand er noget bævet (se
Fig. 2).
De 3 bagerste Forkropssegmenter er betydelig større
og tilsammen omtrent lige lange som hele det forreste Parti
af Legemet. De er alle, i Modsætning til hvad Tilfældet
er hos enkelte andre Arter af Slægten, tydeligt
begrændsede fra hinanden og oventil stærkt hvælvede samt viser
langs ad Midten en grund Fure. der til Siderne er begrændset
af afrundede knudeformige Fremspring. Paa dem alle er
den forreste Rand stærkt buet og Sidedelene fortil gaaende
ud i et skarpt Hjørne.
Bagkropssegmentet er ualmindelig stort og bredt, neppe
mindre end de 3 bagerste Segmenter tilsammen,
skjoldfor-migt, med jevnt buede Sidekanter og bagtil i Midten
udtrukket i et stumpt Fremspring, paa hvis Underside
Anal-aabningen er beliggende (se Fig. 3 og 24).
Øine mangler fuldstændigt ligesom hos alle øvrige
bekjendte Former af denne Familie.
lste Par Folere (Fig. 5) udspringer fra den forreste
Del af Hovedet og er adskilte ved et tydeligt Mellemrum,
der danner ligesom en Bro mellem Panden og Epistomet
(se Fig. 1 og 4). De opnaar neppe mere end ’/ä af
Totallængden og bestaar af et 3-leddet Skaft og en mangeleddet
Svøbe. Skaftets lste Led er i høi Grad udmærket ved sin
betydelige Størrelse og eiendommelige, næsten skjældannede
Fonn. Det ender fortil med et afrundet Fremspring og
viser paa sin øvre Flade nær Enden en Grube, hvori den
følgende Del af Følerne er meget bevægeligt indloddet.
Skaftets 2 sidste Led er meget smaa og synes derfor
snarere at udgjøre den basale Del af selve Svøben. Denne
er smalt cylindrisk, særdeles bøielig og sammensat af et
stort Antal meget korte Led, der ved Roden er mindre
tydeligt adskilte. De bærer alle i den ene Kant
gjennemsigtige baandformige Sandsevedhæng, der tilsammen danner
ell tæt Frvndse langs ad Svøben.
segments and the abdomen. The boundary between these
regions is in the present form marked off much more
sharply than in the other species of the genus, a distinctly
perceptible instriction separating the two.
The integuments are very thin, and translucent, as
also without any prominent sculpturing.
The head is large and broad, uniformly arched above,
and on either side emarginate, for the insertion of the
antennæ. In the middle, the front protends obliquely
downward, between the bases of the 1st pair of antennæ, without
forming any distinct frontal apophysis, and unites there
with the lunate and somewhat projecting epistome (see
fig. 4).
The 1st segment is but little broader than the bead,
and furnished only with small and very slightly projecting
epimera. The 3 succeeding segments are, on the other
hand, broader, and have the epimera more lamelliform, and
uniformly rounded. These 4 segments are each of them
transversely hollowed above, both the anterior and the
posterior margins being somewhat raised (see fig. 2).
The 3 posterior segments are considerably larger, and.
taken together, about equal in length to the whole of the
anterior section of the body. Contrary to what occurs
with some species of the genus, they are distinctly defined
from each other, and above very considerably arched,
exhibiting, too. along the middle, a shallow groove, marked
off along the sides by a rounded, tubereuliform projection.
In each of them, the anterior margin is very arcuate, and
the lateral parts jut forth anteriorly as an acute angle.
The abdominal segment unusually large and broad,
and very little, if at all. smaller than the 3 posterior
segments taken together, is scutiform, with uniformly arched
lateral margins, and posteriorly, in the middle, drawn out as
an obtuse projection, on the under surface of which occurs
the anal opening (see figs. 3 and 24).
No trace whatever of eyes, as in all other known
forms of this family.
The 1st pair of antennæ (fig. 5) originate on the
foremost part of the head, separated one from the other
bv a distinct interspace, constituting, as it were, a bridge
between the front and the epistome (see figs. 1 and 4).
They attain scarcely one-fourth of the total length, and
consist of a three-jointed peduncle and a multi-articulate
flagellum. The 1st joint of the peduncle is strikingly
characterized by its considerable size and very peculiar, almost
squamiform shape. It terminates anteriorly in a rounded
projection, and exhibits, on its upper surface, near the end.
a small cavity, into which the remaining part of the
antenna is very movably jointed. The 2 last joints of the
peduncle are very small, and would, therefore, appear rather
to constitute the basal part of the flagellum itself. The
latter is slender-cylindrie, exceedingly flexible, and composed
of a large number of very small articulations, which, at the
base, are less distinctly separated. On one of the margins,
they all bear translucent riband-shaped appendices, constituting
together a thick fringe along the surface of the flagellum.
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