209 



colour. Inferior wings of a light semitransparent silvery hue, with 

 a deep marginal fringe. Thorax similar in colour to anterior wings 

 and not crested. Abdomen yellowish ; the entire of the under side 

 light silvery grey. The wings are slightly convoluted in repose. 



Antennce (fig. 5, magnified portion) rather short, setaceous, and 

 scaly above. 



Labial paljn (figs. & & 7, denuded), 3-jointed, covered with fea- 

 thery scales. Basal and terminal joints nearly equal, and each 

 about one half the length of the middle one. The whole cylindrical 

 and terminating in a point, and bending upwards and forwards to 

 about level with the top of the eye. 



The legs. — Anterior pair (fig. 8) small and spurless. Tibise half 

 the length of the femora. Second pair (fig. 9), two spurs at ends of 

 tibise. Posterior pair (fig. 10), four spurs. The second and poste- 

 rior legs are long, and nearly equal to each other. The whole of 

 the legs are closely covered with feathery scales, thicker however, 

 and intermixed with some hairs on the tibise of posterior pair. Tarsi 

 in all 5-jointed (first joint about equal to remaining four) terminating 

 in small claws. 



8. Description of a species of Perga, or Saw-fly, found 

 feeding upon the eucalyptus citriodora of hooker, 

 OR Wide Bay Lemon-scented Gum-tree. By Dr. George 

 Bennett, of Sydney, F.Z.S., and A. W. Scott, Esq., 

 Member of the Legislative Assembly of New South 

 Wales. 



(Annulosa, PI. LXII.) 



Among numerous Eucalypti or Gum-trees growing in great pro- 

 fusion in New South Wales, a species, named Eucalyptus citriodora 

 'by Sir William Hooker, is peculiar to the Wide Bay district at 

 the northern part of the Colony. It is a tree of graceful and elegant 

 growth, and assumes a picturesque character and appearance devoid 

 of stiffness ; and as the younger branches become elongated towards 

 the top, they gradually yield and become partially pendent. It bears 

 delicate white flowers in clusters, which attract by the honey secreted 

 within them numerous insects and honey-eating birds. The foliage 

 affords food to the larvae of many insects, which sometimes appear 

 in such myriads as to denude the tree ; and the flowers are the resort 

 of a great variety of Coleopterous and other insects. This tree has 

 a great claim to picturesque beauty, and proves an ornament to 

 any landscape when seen growing in its native soil. It does not 

 produce timber of any great size, nor am I aware of its being used for 

 any particular purpose. At Wide Bay it has been known to attain 

 the height of from 80 to 95 feet, with a circumference of from 8 

 to 10 feet. It has recently been introduced into the Botanic Garden 

 at Sydney, from the Wide Bay district, and has been found to be 

 of quick growth. My friend Mr. C. Moore, the Director of the 



No. 397. — Proceedings of the Zoological Society. 



