Dragonfly from Northern Australia. 107 



apical, triangular spot directed towards the base of the seg- 

 ment ; 10 wholly bronze-black ; sides of abdomen blue ; 

 abdomen beneath very pale, slightly bluish. 



Anal appendages, viewed in profile, well separated, nearly 

 equal in length, and not quite as long as segment 10 ; the 

 upper appendage subovate, pale, giving rise to a strong 

 black basal spur below, directed slightly backwards and 

 towards the lower appendage ; the lower appendage black, 

 simple, almost straight, subcylindical, and resting upon a pale 

 bulbous base. In dorsal view the superior appendages are 

 subcorneal and slightly divergent ; the inferior appendages 

 are curved inwards, and a conspicuous pale tooth projects 

 inwards and backwards from the base of each. 



Amtroagrion exclamationis, sp. n., type $ . Left profile-view of 

 anal appendages. — H. Knight del. 



? (allotype). 30 miles E. of Darwin, Northern Territory, 

 10. xii. 1914, G. F. Rill. 



Length of abdomen 17*5 mm. ; length of hind wing 12 mm. 



Labium yellowish white. Labium and gense yellowish. 

 Anteclypeus pale green. Postclypeus dark green. Frons 

 yellowish, marked with a lunulate black spot, as in male. 

 Head behind the antennae dull black, with a pair of rect- 

 angular yellow spots connecting the ocelli, as in male. 

 Postocular band narrow, greenish yellow. Basal joint of 

 antenna yellowish ; second joint blackish ; remainder 

 missing. 



Pronotum glossy black, bordered as in male, excepting 

 that the hind margin appears to be lined with light green 

 uninterruptedly ; the hind margin more distinctly trilobed 

 than in male. Sides of prothoiax pale green. 



Thorax pioper as in male. 



Legs as in male, but with the dark markings on femora 

 externally reduced and less intense. 



Pterostigma pale greenish yellow. Eight postnodals in 

 the fore wings and six or seven in the hind wings. M 2 

 separating at the fourth postnodal in the fore wings, and 

 between the third and fourth postnodals in the hind wings. 



