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Psyche 
[ September 
14. Tillyard, R. J. On some problems concerning the de- 
velopment of the wing venation of Odonata. Proc. 
Linn. Soc. New South Wales, 39, 1914. 
15. Tillyard, R. J. On the development of wing venation 
in the Zygopterous dragon-flies, with special refer- 
ence to the Calopterygidse. Proc. Linn. Soc. New 
South Wales, 40, 1915. 
16. Woodworth, C. The wing-veins of insects. Univ. 
Calif. Publ. Agric. Exper. Sta., Tech. Bull. 1, 1906. 
17. Marshall, W. The development of the wings of a 
caddis-fly, Platyphylax designatus Walk. Zeitschr. 
Wiss. Zool., 105, 1913. 
18. Needham, J. Burrowing may-flies of our larger lakes 
and streams. Bull. Bureau Fish., 36, 1917-1918. 
Explanation of Figures 
Fig. 1. Wing (hind?) of Polioptenus elegans Goldenberg. 
Fig. 2. Fore wing of Eumecoptera laxa Gold. 
Fig. 3. Wing of Triplosoha pulchella Brongn. 
Fig. 4. Wings of Hexo.genia biiineata Say. 
Fig. 5. Fore wing of Gomphus descriptus. 
Fig. 6. Basal part of hind wing of Heterophlehia dislo- 
cata Brodie and Westw. 
Fig. 7. Base of hind wing of Phylopetalia apicalis Selys. 
Fig. 8. Wing of Protomyrmeleon brunonis Geintz. 
Fig. 9. Tracheation of wing of nymph of Lestes rec- 
tangularis Say. 
Fig. 10. Hind wing of Palingenia longicauda Oliv., 
after Eaton (5). 
Fig. 11. Tracheation of the aniage of the fore wing in 
the adult nymph of a member of the Hexa- 
genioidea Ulm. (original). 
Fig. 12. Anormalous tracheation in the hind wing aniage 
of a nymph of ^Eschna sp. (original). 
Figures 1, 2, 3, 6, and 8 after Ilandlirsch (6) ; Fig. 4 after 
Needham (8) ; Figs. 5, 7, and 9 after Need- 
ham (10). 
