Ll 



BY R. J. TILLYARD. 579 



Subfamily ^ s c h n i N .E. 



(7. AUSTRO^ESCHNA PARVISTIGMA Sel3^S. 



[8. AusTRO^scHNA MULTi PUNCTATA Martin. 



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

 or varieties of one species, each inhabiting its ow^n geographical 

 region. The type-form, A. pm'vistigma Selys, occurs commonly 

 on mountain-streams throughout Tasmania, and on the Mount 

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

 multipnnctafa Martin, which extends through Gippsland to the 

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



Blue Mountains, descending to the coastal hills around Sydney. v 



Further nox'th, at Dorrigo, I found A. midtipunctata last year as \- 



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



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



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



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



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



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



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

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

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

 tinct are they, that I was able to distinguish both sexes on the 

 wing. The following are the chief differences : — 



A. imrvistigma Selys. A. multipunctata Martin. 



Pterostigma 2-2 '3 mm ; mevi- PferostigTna 2 "7-3 mm.; niem- 



hranule 2 mm., triangular, grey, brcmnle 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 

 immatui'e males). 



Head : a thin whitish band Head : front continuously 



along front bordering the cly- dark brown right down to 

 peus, and separated from it by clypeus. 

 a dark line in the suture. 



