342 The Large Poplar Longhorn 



definitely proved, that they will be more extensively planted in the 

 future. Of all the more importance, then, both to forester and nursery- 

 man, is the intensive study of this possible deadly enemy. 



In conclusion it is with great pleasure that I acknowledge the advice, * 

 encouragement and facilities granted me by Dr R. Stewart McDougall 

 in the carrying out of this work. 



I am also indebted to Miss Clark, artist, Edinburgh, for the painting 

 of the two coloured figures. 



I particularly wish to express my thanks to the Carnegie Trust for 

 the Universities of Scotland, for grant to cover artist's fee and cost of 

 the reproduction of the figures. 



LITERATURE. 



(1) Fowler. Coleoptera of the British Isles, iv, p. 252. 



(2) Coleoptera of the British Isles, iv, pp. 243-44. 



(3) Gahan, C. J. Description of new or little known species of the genus Glenia 



in the Collection of the British Museum. Trans. Ent. Soc. Land. 1889, 

 p. 213. 



(4) Felt, E. P. (State Entomologist.) Monograph of the Genus Saperda. N.Y. 



State Museum Bulletin 74, Entomology 20. 



(5) Lindemann. Vergleichend-anatomische Untersuchung iiber das Maenliche 



Begattungsglied der Borkenkaefer. Bull. Soc. Imp. Moscow, xlix, 1875, 

 pp. 196-252, 5 pis. 



(6) Verhoeff. In Abdominal segmente und Copulations-organe, etc. Deutsche ent. 



Zeitschr. 1893, p. 156, PI. IV, Figs. 126-140. 



Ueber das Abdomen der Scolytiden. Arch. f. Naturgesch. lxii, 1896, 1, 



pp. 110-144, 2 pis. 



(7) Hopkins. On the genus Pissodes. U.S. Dept. Agric. Ent. Techn. Ser. 20, Part I, 



1911. 



(8) Nusslin. Phylogenie und System der Borkenkaefer. Zeitschr. wiss. Insekten - 



biol. 1911 and 1912. 



(9) Sharp and Muir. The Comparative Anatomy of the male genital tube in 



Coleoptera. Trans. Entom. Soc. Lond. 1912, Part III, pp. 477 et seq. 

 Sharp. Studies in Rhyncophora. Trans. Entom. Soc. Lond. 1918, Parts I and II, 



pp. 209-229. 

 Muir. Notes on the Ontogeny and Morphology of the male genital tube in 



Coleoptera. Trans. Entom. Soc. Lond. 1918, Parts I and II. 



(10) Ratzeburg. Die Forst- Insekten, i, pp. 234-235, 1839. 



(11) Altum. Forstzoologie. III. Insekten, pp. 308-9. Berlin, 1874. 



(12) Schiodte. Naturhistorisk Tidsskrift, Series 3, Bd 10, pp. 381 and 437-39. Kjo- 



benhavn, 1875-76. 



(13) Kaltenbach, J. H. Die Pflanzen-Feinde aus der Klasse der Insekten, p. 542, 1874. 



(14) Tachenberg. Praktische Insekten-kunde, I, pp. 256-58, 1879. 



