BY G. A. WATERIIOUSK. 2.33 



terminal free portion of the costal is often very dilHcult to 

 see. 



Loc — South Australia, Victoria, New South Wales, Queens- 

 land to Mackay and North West Australia {$ 40, 9 40). 



Una, de Niceville. 



Butt. Ind. iii. p. 51, 1890. 



Subcostal three-branched, 1st branch entii'ely anastomosed 

 with costal except a very short free basal portion. Type 

 U. usta, Distant. The genus, as regards neuration, is allied to 

 Utica. The Australian species I place in this genus are only 

 doubtfully referable there; though structurally they are identical, 

 yet the shape of the wings is different. Mr. de Niceville, who 

 knew three of the species, noted them as Zizera (1), but then 

 he had not examined them structurally. I have little doubt 

 that these species will eventually be placed in one or two other 

 genera (perhaps as yet undescribed), but for the present I 

 hesitate to undertake that task myself, as I know there are 

 allied South African forms which as yet I have had very little 

 opportunity of studying. Prosotas, Druce, is close to, if not 

 identical with. Una, but my acquaintance with these genera 

 is only from figures. They appear to be quite tropical forms, 

 whereas all the Australian species are southern forms, one 

 section being entirely confined to Spencer's Bassian Region. 



Our present knowledge of these species is very meagre, which 

 is remarkable considering their number if looked for at the right 

 season. This, I think, is due to their being looked upon as too 

 common to be worth catching, a mistake too often made in Aus- 

 tralia. All the species appear to have only a single brood during 

 the year, though if this is the case with those species that extend 

 into Queensland I am unable to say. For the three S3''dney 

 species my dates are: — agricola, 8th Sept. to 6th Nov.; inathewi, 

 22nd Sept. to lOtli Nov.; serperitata, 20th March to loth April. 



I am able to recognise five distinct species, though subsequent 

 investigation may show I am including one or two others wliicli 

 are really specifically distinct, but want of sufficient material with 



