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Juday, Chancey (ed.) / Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume XXI (1924)

Noland, Ruth Chase
The anatomy of troctes divinatorius muell,   pp. [195]-211 ff. PDF (5.2 MB)

Page [195]

                     RUTH CHASE NOLAND
  The internal anatomy of Troctes divinatorius has never been
carefully worked out, though the insect has frequently been de-
scribed as a not uncommon household pest. In 1818 Nitzsch (18)
published a description and figures of the digestive tract and re-
productive organs of an insect which he called the book louse,
Psocus pulsatorius. In a number of ways my descriptions differ
from his, and it is probable that the insect which I have had is a
different species, although of the same genus, for the generic names
Psocus, Troctes, and Atropos have all been used in reference to the
genus to which the book louse belongs. Since the time of Nitzsch,
the only work which has been done on the book louse from an
anatomical point of view has been that on the mouthparts, and is
very little. However, considerable study has been made of the
mouthparts of a closely related family, the Psocidae. This has
been  one by Brgs           agen_(4    and-others and has-been
of interest largely because of the light it throws on the relation-
ships of these to other insects.
  The studies made here of Troctes are based on examinations of
hundreds of individuals in whole mounts, longitudinal, and cross
sections and in dissections made in glycerine or in balsam under
the dissecting microscope. The small size of the specimens, none of
them more than a millimeter and a half in length, has made neces-
sary the working out of many details by comparison in a large
number of specimens. For the gross anatomy the micro-dissections
stained in alum carmine, or haemalum gave most information;
while the smaller details and histology could only be determined
from sections. These were stained with Heidenhain's or Delafield's
haematoxylin. A number of fixatives were used, but probably the
best results came from Carnoy's I and II, and Kahle, Tower and
Petrunkewitsch. Very much assistance in the work was given by
Professor W. S. Marshall, under whose direction it was carried out.

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