BY R. J. TILLYARD. 579 



Subfamily ^ s c H n i N iE. 



(7. AUSTRO^SCHNA PARVISTIGMA SelyS. 

 8. AUSTRO^SCHNA MULTIPUNCTATA Martin. 



These two forms have, so far, been regarded as distinct races 

 or varieties of one species, each inhabiting its own geographical 

 region. The type-form, A. parvistigma Selys, occurs commonly 

 on mountain-streams throughout Tasmania, and on the Mount 

 Lofty Ranges, near Adelaide. In Victoria, it is replaced by A. 

 multipunctata Martin, which extends through Gippsland to the 

 Kosciusko district of New South Wales, and right up to the 

 Blue Mountains, descending to the coastal hills around Sydney. 

 Further north, at Dorrigo, I found A. multipunctata last year as 

 early as October. Later on, in December, at an elevation of 

 4,000 to 5,000 feet, at Ebor (Guy Fawkes), N.S.W., I found 

 both forms flying together, and was enabled to study them on the 

 spot. As a result, I have now no doubt as to the specific dis- 

 tinctness of the two forms, which can be separated even in the 

 larval stage. In the imagines, besides the differences noted by 

 Martin in the size of the pterostigma and form of appendages, 

 there is a well-marked and constant difference, both of coloura- 

 tion and colour-pattern on head, thorax and abdomen. So dis- 

 tinct ai'e they, that I was able to distinguish both sexes on the 

 wing. The following are the chief differences : — 



A. parvistigma Selys. A. multipunctata Martin. 



Pterostigma 2-2 '3 mm ; mem.- Pterostigma 2-7-3 mm.; mem- 

 hranule 2 mm., triangulai', grey, branule slightly shorter and 



wider, outer edge convex. 



Colouration very dark brown Colouration rich dark brown, 



or black, with creamy markings with pale blue-grey markings in 

 in the mature insect. the mature insect (creamy only 



in immature females and very 

 immature males). 



Head : a thin whitish band Head : front continuously 



along front bordering the cly- dark brown right down to 

 pens, and separated from it by clypeus. 

 a dark line in the suture. 



