BV R. J. TILLYARD. 437 



yellowish lateral spots; 10, very short, with small lateral 

 spots. Appendages 0-2 mm., conical, wide apart, black. 

 Ovipositor with the keel very minutely toothed, ending in a 

 pair of rather thick single-jointed downy filaments. 



Hab. — Heathcote,Illawarra Line, N.S. W., November-December. 



Types: cT?, Coll. Tillyard; Heathcote, Nov., 1907. 



This rare insect resembles Isosticta simplex, at first sight, 

 so exactly in habits and colouration, that I have no doubi 

 that it will often be overlooked, as it was at first by myself, 

 by collectors familiar with the commoner species. Having 

 previously taken /. simplex fairly commonly, both at 

 National Park and Lily Vale, but never earlier than Janu- 

 ary, I was much surprised at encountering an insect so simi- 

 lai', and in a locality so close, at the beginning of November ; 

 and I thought at first that /. simplex must be double- 

 brooded. However, on capturing one, I noticed the remark- 

 able difference both in venation and appendages. Along the 

 banks of the Woronora River and Heathcote Creek, these 

 insects are fairly abundant, and are very fond of hiding in 

 overhanging bushes, or indulging in short poising flights in 

 the confined spaces between the branches. The males, how- 

 ever, also fly fairly quickly along short reedy stretches of 

 the creek-banks, and I think we may claim this insect to be 

 more active and of stronger flight than /. simplex. This is 

 mainly dvie, not to any superiority in the wing, but rather 

 to the shorter abdomen, which gives the insect a better 

 balance when flying. 



Kace dorrigoeiisis. — On the Little Muri'ay River, near 

 Dorrigo, N.S.W., I met with this insect again, in November, 

 1911, and secured two males, for comparison. I was much 

 surprised to notice the great difference in size and coloura- 

 tion between these and my type-series. Total length, 43 mm. , 

 hindwing, 25 mm. Superior ajipendages considerably lar- 

 ger, but of same form. Segments 8-10 strongly powdered 



