426 MESOZOIC INSECTS OF QUEENSLAND, Hi., 



Genus Aero plan a, n.g. (Plates xliv.-xlv., Text-figs. 14, 15). 



Characters of the family, with the following additions. First 

 and second origins of Rs arising not far apart, the portion 

 between them somewhat curved concavely to R. First dichotomy 

 of M at same level as first origin of Rs. In forewing, the 

 anterior branch of M gives rise to thi-ee branches, by two dicho- 

 tomies which take place at some distance from the first; the pos- 

 terior branch also gives rise to three branches, which arise much 

 closer to the original forking. The middle of these three last 

 branches forks again, a little further distad. Thus there are 

 seven branches in all, three arising from the anterior branch, and 

 four from the posterior. In the hindwing, the anterior branch 

 of M remains simple for a considerable distance, but finally 

 divides into two only; the posterior branch, on the other hand, 

 soon divides again into two, of which the upper branch gives 

 rise to three branches by two separate dichotomies, the lower to 

 two only. Thus there are also seven branches of M in the hind- 

 wing, but of these only two arise from the anterior branch, and 

 five from the posterior. 



The two branches of Cu diverge very slightly from one another 

 at first, both tending to diverge also from the radius, in the same 

 manner that the media does. A little further distad, close to 

 the level of the first origin of Rs, Cuo begins to curve strongly 

 away from Cuj, forming a wide bend, and later on again ap- 

 proaches Cu], to run parallel to and beneath it. 



Just distad from the first dichotomy of M, in the hindwing 

 only, a weak, curved supplement runs back obliquely to join Cuj, 

 resembling in form the anal supplement below A, but on a 

 smaller scale. 



(Jenotype, Aeroplana lulraljilis, n.sp. (Upper Triassic, 

 Ipswich, Q.). 

 Aeuoplana mirabilis, n.s}). (Plates xliv.-xlv.. Text-figs. 14, 15). 



Total length of fossil as preserved, from base of hindwing to 

 end of isolated piece of forewing, 41-5 mm. Total length of 

 preserved portion of hindwing, 26mm.; greatest breadth of same, 

 5 mm. 



