420 NEW AND RARE AUSTRALIAN AORTONID.E, 



The Dorrigo series were all found either settled upon or 

 flying round the ferns which clustered on the steep, rocky 

 sides of a small waterfall, about twenty feet high, in dense 

 scrub. Compare the account of habits of Orisfirfa fi/icicolo, 

 n.sp., below). The single Bellinger male was found sitting 

 on a hanging mass of creepers over a small creek, just near 

 its entrance into the river. Two other males were also seen 

 flying about dense vegetation near a waterfall, half-way up 

 the range, between the above localities. Hence this species 

 ranges from near sea-level to 2,500 feet. 



Allied to A. yrls)>ns Selys, and A. minhmut Tillyard( W.A.). 

 Tu colouring, it is not unlike an immature A. (jrisens without 

 anv grey pruinescence, but it can be distinguished at once 

 from that species by its much slenderer bviild, smaller ptero- 

 stigma and much narrower wings : in particular, the spaces 

 between costal and radian nervures, and between the latter 

 and the principal sector, hi'ijoiKl the nodus, are very much 

 nari'owei' than in A. c/risftits. The form of the appendages of 

 the male is very diiierent from tliat of A. (/risens, for, in the 

 latter, the superior are inclined much more gently towards 

 the tips, and the inferior are truncated, not triangular. From 

 .1 . mi/iuinis, it differs in its greater size, more rounded wings, 

 shorter, thicker, and darker pterostigma, and notably in the 

 colour-pattern of the thorax, and shape of appendages of 

 male. It also resembles, at first sight, a very small specimen 

 of ,4. irfrroiiif'Ins, but is, in reality, very different from that 

 species, es])ccially in being uniformly hairless, and in lacking 

 the strong inferior spine on the male a])pcndages. 



Types: ^^9, Coll. Tillyard( Dorrigo, N.S.W.). 



Kfi/ to the. Auslrufiim Spfciat a/ (he Gtnns Ar(jiohstf.». 



'Large species( <J .abddriien 30-40 nun.), willi a con- 

 spicuous inferior spine or tctotli on append- 

 ages of male 1. 



Small to medium species( i , abdomen 20-30 mm.), 

 nnthout a conspi(;iions inferior s])ine on ap- 

 pendages of male , -. 



