BY R. J. TILLYARD. 4|3 



Types: (J$, Coll. Tillyard (Alexandra, Vic). Specimens 

 from Mittagong, N.S.W., have the stature of B, but the pruin- 

 escence as in A, and may be considered as connecting these two 

 forms. 



C. Race eboracus. — A short series taken by me at Ebor and 

 Dorrigo, N.S.W., (where this species is quite common) for com- 

 parison with the type-form A, shows such remarkable differences 

 that one would almost certainly consider them as a distinct 

 species, were it not for the existence of the connecting form B. 



Total lengthy ^ 28, 5 30-5; abdomen, ^ 30, 9 24; hiudwing, ^<^, 

 24 mm. 



Wifigs broad and well rounded in both sexes; vertex of male 

 pruinescent; upper part of thorax completely covered with thick 

 grey pruinescence, almost completely hiding the humeral bands. 

 1^0 pi-innesceiice ott abdomen of (J: Q with no pruinescence. 

 Aj)pendages : ^, sn.j)erior 1'2 mm., very slender, of typical A form; 

 inferior very short, 0*2 mm., blackish, and inclined inwards very 

 much towards one another : ^, as in form A. Abdomen of ^ 

 very long, fairly stout; that of ^ very short and much stouter 

 than in A or B. 



This form, so large and distinct in appearance from the type, 

 corresponds with the race nobilis(see above) of A. icteromelas 

 Selys, from the same locality. I am inclined to regard these 

 large alpine forms as being the most archaic forms, the others 

 being asthenogenetic or reduction-stages brought about by the 

 more strenuous competition with a more numerous Agrionid fauna 

 in the less elevated and coastal regions. The fact that the type- 

 form, however, is also alpine, reaching from 2,000 to 4,000 feet 

 on the Blue Mountains, is difficult of explanation, except on the 

 grounds that this remarkable mountain range possesses in many 

 ways a fauna of its own, while the more truly alpine forms of the 

 great ranges of Victoria and Southern New South Wales are 

 found repeated y?«-^/ier north and at a less elevation on the high 

 tablelands of Ebor and Dorrigo. 



Types: $^, Coll. Tillyard(Ebor, N.S.W.). 



D. Race tennis. ~ A single male, taken at Hornsby, N.S.W., 

 December, 1909, and hence at a lower elevation and much nearer 



