324 
Studies on Pediadus 
EXPLANATION OF PLATES III AND IV. 
PLATE III. 
Copulatory apparatus of Pedicuhis huwanvft 
Fig. 1. Apparatus in its retracted state, treated with caustic potash, isolated, and viewed 
dor.sally. The vesica is inverted and most of it lies in the hollow of the basal 
plate. It contains the penis which points into the cleft of the dilator. The 
ductus ejaculatorius issues on one side. 
Fig, 2. Apparatus in situ, showing the first stage of extrusion of the vesica penis, the 
point of the penis appearing through the cleft in the dilator. Caustic potash 
preparation. 
Fig. 3. Detail of the fully everted vesica penis, showing the penis with the therein con¬ 
tained ductus ejaculatorius, the statumen penis and a portion of the vesica 
with its strongly chitinized teeth. More highly magnifi^ than the preceding 
figures to which the accompanying scale applies. 
PLATE IV. 
The relations of the ^ and $ apparatus when in copula. 
Drawing from mounted specimen of a pair killed in copula; the male parts printed in 
black, the female parts in red. For nomenclature of parts see preceding figures and 
text. Specimen treated v/ith cau.stic potash. 
Note all of these figures were drawn by me with the aid of a camera lucida. This remark 
likewise applies to the text-figures, excepting Nos. 9, 10 and 11. 
REFERENCES. 
Castellani, a. and Chalmers, A. J. (1&13). Manual of Tropical Medicine, 2nd ed. 
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Cummings, B. F. (m. 1916). Studies on the Anoplura and Mallophaga, being a 
report upon a collection, etc. Proc. Zool. Soc. London, 1916, Part i, 253-295, 
24 text-figs. 
Lassidois, L. (1865a). Untersuchungen fiber die auf dem Menschen schmarotzenden 
PedikuUden. III. Anatomie des Pediculus vestimenti Nitzsch. Zeitschr. f. 
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Leeuwenhoek, A. van (English ed. 1807). The select works of Antony van Leeuwen¬ 
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Mjobebg, E. (1910). Studien ueber Mallophagen und Anopluren. (Ph.D. Disser¬ 
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Muller, J. (1915). Zur Naturgeschichte der Kleiderlaus. Das Oesterr. Sanitdtsw. 
xxvn, issued also as a reprint of 75 pp., with 4 plates and 37 text-figs, and an 
Appendix. 
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London, Madras and Calcutta, xxxiv -1-764 pp., 89 pis. 
Pawlowsky, E. N. (1907). [Anatomy of the sexual organs of Pediculus capitis and 
P. vestimenti.] Horae Soc. Entomol. Rossicae, Petrograd, xxxvm, 82-108, 
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Peacock, A. D. (1916). The louse problem at the Western Front. Joum. Roy. 
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