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. -211 ff. PDF (5.2 MB)
THE ANATOMY OF TROCTES DIVINATORIUS MUELL RUTH CHASE NOLAND Introduction 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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