BY R. J. TILLYARD. 713 



1. Petalura gigantea Leach (Zool. Misc. ii. p. 96). 

 (Plate xxxiii., fig8.2, 5-6.) 



(J. Total length 87-97 mm.; abdomen 63-73 mm. Forewing 

 52-58 mm.; hindwing 50-56 mm. 



Wings: Neiiration black, strong, costa pale yellowish out- 

 wards, ribbed with black. Triangle of forewings with two cross- 

 nervures, of hindwings with one cross-nervure (rarely free). 

 Hind wings strongly angulated anally. Fterostigma very long 

 and narrow, black, 9 mm. in forewing, 10-5 mm. in hindwing. 

 Jlejubranule small, pale; forewing 1-5 mm.; hindwing thicker. 



'2 mm. Nodal Indicator |Circ. 19 circ. 10 



Head: Occiput 

 raised in middle. 



thick, downy, black, slightly!! 14-16 9-10 



Eyes 2 mm. apart, dark brown, a yellow line behind on the orbital 

 ridge. Vertex small, black; the two outer ocelli set on raised 

 tubercles, the middle one slightly in front, smaller, not raised, 

 black; antennae 3-5 mm., black. Front large and broad, slightly 

 indented medially; the base, next the vertex, is covered by the 

 black colour of the vertex, forming a transverse band along the 

 base; rest of front pale yellow finely granulated with black dots. 

 Clypeus very dark brown shading to black; an obtusely pointed 

 lamina on each side, projecting downwards to labrum; lahrum 

 pale yellow, a fine black point entering medially from above; 

 lower parts of mouth dull dirty yellowish, mouth edged with 

 black or dark brown. Thorax: Prothorax blackish, with a 

 touch of yellow on the collar behind; covered with downy greyish 

 hairs. Meso- and metathorax large, strongly built, downy, colour 

 chocolate-brown above, dorsal and interalar ridges touched with 

 black, the former elevated near the middle into an obtuse spine; 

 on either side of the dorsal ridge, and touching it, is a broad 

 band of dull orange-brown, the outer margin being slightly 

 curved; some greyish hairs in front next the prothorax and also 

 on the notum near the wing-joins. Sides glaucous brown with a 

 distinct straight lateral band of dirty yellowish-grey which is 

 continued across the notum; rest of notum black. Lower parts 

 of sides brownish, with grey hairs; near the abdomen is a second 



