578 ON SOME AUSTRALIAN ANISOPTERA, 



stigma is also yellow. Specimens of A. collaris received at the 

 same time are coloured pinkish-brown; this species is marked 

 with yellow when alive.] Abdomen: 1-2 swollen, 3-7 slender, 

 8-10 slightly enlarged. CoIou7' black, marked with yellow as 

 follows : — 1, downy, a dorsal patch anfl large lateral spots; 2, 

 downy, a dorsal mark shaped like a Roman torch; sides yellow, 

 auricles small, yellow touched with black; 3, two large basal 

 blotches nearly meeting dorsally; two lateral spots towards apex; 

 4-7, two large basal spots nearly meeting dorsally; 8-9, two small 

 basal spots; 10, black, carrying, at extreme outer apical edge, a 

 pair of small black projecting spurs about 0'5 mm,, long; in profile, 

 the spur is rather broad and rounded, and hollowed out on the 

 outer surface (Plate Ixii., figs. 6, 7a). Appendages: superior 

 1-5 mm., yellow, subforcipate, meeting at tips, which are slender 

 and pointed inwards; with a fine yellow spur projecting outwards 

 near base, parallel to, but not quite as long as the spur on 10. 

 Inferior 0"5 mm., broad, bifurcated, upcurved, yellow (Plate Ixii., 

 figs. 6, 7,s.i,b). 



<^. Total leiigth 39-42, obdomen 28-30, foreiving 27-28, hindwiiig 

 25-26 mm. 



Pterostigma 4 mm. Occiput with a projecting yellow ridge 

 carrying long hairs, but without tubercles (Plate Ixii., fig.8). 

 Similar to male, but with thicker cylindrical abdomen carrying 

 pairs of large oval spots both basal and central on 3-7; 8-9 with 

 large spots low down on sides; 10, yellow on sides. Vulvar scale 

 with two exceedingly short pointed slender contiguous branches. 

 Appendages 0*5 mm., black, pointed. 



//a6.— Waroona, W.A. Taken by Mr. G. F. Berthoud; No- 

 vember, 1910 and 1911; three males and nine females. 



Types: $<^,Co\\. Tillyard. 



This very rare insect differs so much from the other members 

 of the genus, that it will probably form the type of a new genus. 

 The remarkable development of parallel spurs on segment 10 and 

 the superior appendages seems to be a contrivance to enable the 

 male to clasp the occipital ridge of the female, which, in this 

 species, is not furnished with the usual tubercular processes by 

 which this object is accomplished. 



