BY R. 



TILLYARD. 



477 



white area. This white colour deepens very slowly, bpcoming 

 first of all cream-coloured, then lemon-yellow, then a rich golden 

 (the stage at which the type-male was described), and finally a 

 rich orange-red in the male. The female darkens further to a 

 deep red. These changes take about six days to accomplish. In 

 A. mnabilis, the parts destined to become red are at first a dirty 

 white, soon becoming straw-colour, then ochreous, then dull 

 orange, and finally brick-red in lioth sexes. The changes in this 

 species are accomplished in three days or less, as I observed on 

 Mount Tambourine in October, 1915, a week after ni}' visit to 

 Maleny. 



a. b. c. 



Text-fig. 10. 

 Colour-scheme of head, thorax, and first three abdominal segments in 

 A7'ffiolMte-^ chry.<io)'de.<i Tillyard; (a, male; c, female); and in A. amahi/ls 

 Ftirster; (h, male; d, female). The black represents black or deep 

 metallic purple, the white either red or orange-red, in the mature 

 insect. 



Subfamily AGRIONIN.E. 

 Genus A g r i o n Selys et auct. 

 10. Agrion brisbanense, n.sp. (Plate xxiii., figs.13-14). 

 (J (unique). Total length, 31 '5; abdomen, 2^[ foreiciiu/, 18"5: 

 hiiidwing, 17 '5 mm. 



35 



