BY R. J. TILLYARD. 577 



patch, from the border of which project two finely pointed yellow 

 spikes (Plate Ixii., fig.5). 



Bab. — PaUa], N.S.W.; Kanierunga and Mackay, N.Q. De- 

 cember. 



Types : ^^, Coll. Tillyard. 



Now that the male is known, I am able to place this species as 

 being most closely allied to A. arenarius Tillyard, from N. 

 Queensland. It resembles this species in the elongation of seg- 

 ments 9 and 1 of abdomen, in the lateral .sheaths of 8 and 9, in 

 the slender abdomen strongly swollen at 8, and in the peculiar 

 form of the appendages. It diifers from it, however, very com- 

 pletel}' in the whole colour-scheme. 



6. AUSTROGOMPIIUS ARMIGER, n.Sp. 



$. Total length 41-43, abdomen 30-32, forewing 24-26, hindiving 

 22-24 mm. 



Wings: neuration black, fine; pterostigma 3-5 mm., reddish- 

 brown between the nervures. Triangle of hindwing very much 

 wider than that of forewing. Hindwing strongly angulated, 

 anal triangle 3-celled. Nodal Indicator [19, 6-71. Head: eyes 

 black, bordered beneath with yellow ; ||8, 7-8| occiput yellow ; 

 vertex black with a large round yellow spot close up to occiput; 

 front, clypeus, and labrum bright yellow; labium yellow, paler on 

 sides. Thorax: prothorax nearly 4 mm. wide, hairy, black, 

 with two geminate yellow dorsal points, and a large oval yellow 

 spot on each side. Meso- and metathorax black, marked with 

 yellow as follows : — a fine collar in front, interrupted dorsally; a 

 suspicion of a line on the dorsal ridge; two large antehumeral 

 stripes or patches, subrectangular and slightly excavated on outer 

 mai'gin; sides completely yellow; scuta and scutella yellow. Legs 

 black, basal parts of femora yellow. \_Note. — In the specimens 

 received by me, the markings of head, thorax, and abdomen are 

 coloured a peculiar pinkish-brown. This colour is obtained by 

 killing any species of Austrogomphus in excess of chloroform or 

 ammonia, or even in a damp cyanide bottle; hence I do not 

 hesitate to describe the markings as yellow. Possibly the ptero- 



