426 ON THE NEW (MENUS AUSTROGYNACANTEA, 



wing of £ rather' short, broad, three-celled. (7) Triangles of fore- 

 and hind-wings of equal length, 6-7 celled, and practically similar. 

 (8) Nodal sector, just below the pterostigma, takes an abrupt and 

 conspicuous bend, and then runs straight to the margin of the 

 wing. (9) Arculus at least 2 mm. from the inner angle of the 

 triangle; at least one hypertrigonal cross-vein interposing. 



Austrogynacantha [G. heterogena]. — (1) Size moderate, 

 expanse of wings in £ about 80 mm. (2) Abdomen of both sexes 

 not constricted at segment 3. (3) Spurs of segment 2 smaller, not 

 very conspicuous, angulated. (4) Hindwings only moderately 

 broad. (5) Anal margin of hindwing of $ scarcely angulated at 

 ally the outer side of the anal triangle scarcely, if at all, thicker 

 than the rest of the postcostal margin, and curving insensibly 

 round to join it at the anal " angle." (6) Anal triangle long and 

 narr oio, four-celled. (7) Triangle of hindwing somewhat shorter 

 and broader than that of the forewing, both four-celled. (8) Nodal 

 sector takes only a slight and gentle curve. (9) Arculus scarcely 

 1 mm. from inner angle of triangle; no hypertrigonal cross-vein 

 interposing. 



The following may be indicated as less important, or subor- 

 dinate, differences : — 



GYNACANTHA(s.str.). — (10) Space between the fork of the sub- 

 nodal sector and the supporting sector beneath it 5 or more cells 

 broad. (11) 4-6 hypertrigonals in hindwing. (12) Between the 

 short sector and the auxiliary sector lying below it, at its broadest 

 point, 4-5 cells. (13) Superior appendages of £ very long (about 

 7 mm.), slender, narrow, and leaf -like. (14) Appendages of 9 

 very long and exceedingly fragile. (15) Pterostigma 3*5-4 mm. 



Austrogynacantha. — (10) Space between the fork of the sub- 

 nodal sector and the supporting sector beneath it 3 cells broad. 

 (11) 2-3 hypertrigonals in hindwing. (12) Between the short 

 sector and the auxiliary sector lying below it, at its broadest 

 point, 3-4 cells. (13) Superior appendages of <J strong and fairly 

 thick, not so long (5 mm.), narrow, sublanceolate. (14) Append- 

 ages of 9 not so long, similar in form, and fragile. (15) Ptero- 

 stigma 3 mm. 



