BY R. J. TILLYARD. 247 



rounded projection; basal three-sevenths black, rest yellow, tips 

 just touched with black. Inferior black, bifurcated, the two 

 branches wide apart, 1*2 mm., rather slender, black, tips turned 

 upwards suddenly into a sharp point (see Plate xxiii., figs.l and 2). 



9. Total length 43 mm., abdomen 32 mm.; forewing 28 mm., 

 hindwing 27 mm. 



It differs from the male as follows. Pterostigrna 3 2 mm. 

 Head : front and chjpeus distinctly hairy on each side; the broad 

 frontal band connected behind by a fine black median stem to the 

 vertex; occiput with a very strong black central spine or elongated 

 tubercle (see Plate xxii., fig. 10). Abdomen : stouter and more 

 cylindrical, 1-2 and 8-10 very slightly enlarged : 1, yellow above; 

 2, a thin yellow dorsal line, sides yellow; 3, with a pair of basal 

 lateral rounded yellow spots and a pair of narrow oval central 

 yellow spots, two-fifths from base of segment; 4-5, with large 

 basal yellow spots on each side, and also a tiny mark on each 

 side, two-fifths from base of segment; 6-7, largn; basal yellow spots 

 on each side; 8, with small double basal yellow spots low down 

 on each side; 9-10, black, sutures touched with yellow; sheaths of 

 8-9 touched with yellow; vulvar scale with two short black 

 bifurcations, separated. Appendages : separate, straight, 1 mm., 

 subconical, not very sharply pointed, somewhat hairy, bright 

 yellow, a black spot at base. 



Hah. — Cooktown, N.Q. Rare; January, 1908. 



I found it only in a secluded spot at the back of Mount Cook, 

 where it inhabits a small mountain brook. It flies in small 

 clearings in company with Synthemis Olivei Tillyard. I took 

 three males and two females in good condition. 



This species is closely allied to A. heteroclitus Selys, a species 

 which occurs locally in New South Wales and Victoria. It can 

 be distinguished readily from the latter as follows : smaller size, 

 front and face much blacker; dorsal stripes shorter and narrower; 

 sides of thorax with two black bands instead of only one half 

 band as in A. heteroclitus. In the latter, too, the notum is much 

 yellower; so are also segments 1-2 of abdomen. The superior 

 appendages of the male resemble those of A. heteroclitus in shape, 



