BY R. J. TILLYARD. 765 



shown ill Text fig. 1, determines the insect as belonging to tlie 

 genus Arteriopteryx Guer. If, however, the forewing has an 

 extra series interpolated in the disc, between the internal and 

 discal series, then the insect belongs to Ptii/chopsis Newman. If 

 the arrangement for the forewing remains as in Text-fig. 1, but 

 the hind wing has one series missing, then the insect goes into 

 Wernzia Navas. If, in addition to this, the terminal series in 

 the forewing is absent, or only partially formed, then the insect 

 belongs to Magcdlanes Navas. 



A complete study of the whole of the cross-veins in the speci- 

 mens in my collection has been carefully carried out. The total 

 number of specimens studied was sixty-four; but many of these 

 have since been given away or exchanged. They represent eight 

 species, two of which are new. The following very interesting 

 and instructive results are here given : — 



Pt^ychopsis illidyei Froggatt. — The male in my collection has 

 three complete series in all four wings. In the forewings, there 

 are numerous scattered cross-veins in the upper distal portion of 

 the disc (Plate Ixxvii., fig. 4), but no sign whatever of a fourth 

 series between </i and g^. Hence, according to Navas, this 

 insect belongs to Arteriopteryx Guer. 



In a large female of the same species, which I examined in the 

 Queensland Museum, and of which photographs are given in 

 Plate Ixxvi., figs. 1-3, there are only three series in the forewings, 

 and no irregularly placed cross-veins elsewhere in the disc. This 

 specimen, then, also- goes into Arteriopteryx^ according to Navas. 



Of two specimens in Mr. Froggatt's Collection, one has three 

 complete series of gradate cross-veins in all four wings. The 

 other has four complete series on the left forewing, and only three 

 on the right. Hence, according to Navas, the first specimen 

 belongs to Arteriopteryx^ the second partly to that genus and 

 partly to Psychopsisl 



Psychopsis mimica Newman. — I have examined seven speci- 

 mens altogether. The forewing shows also three complete series; 

 in addition, there are a variable number of cross-veins in the 



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