BY ARTHUR WHITE. 187 



This genus may be easily distinguished by the small 

 number of posterior cells. In Tasmania two species are 

 known to occur. 



Table of the Tasmanian Sj)ecies of Geron. 



\ . Pubescence yellow ; wings partly tinged with 

 brown ; vein closing the discal cell waved. 



DisPAR, Macq. 



2. Pubescence white; wings absolutely clear; vein 



closing the discal cell straight. Hilaris, Sp. nov. 



Geron dispar, Macq. 



Syn. Geron cothurnatus. Bigot. 



Thorax and abdomen velvet-black, with long yellow 

 pubescence; legs entirely black (r^) or black with posterior 

 femora pale brownish-yellow (j); wings strongly tinged 

 with brown along the costa ; the vein closing outwardly 

 the discal cell waved. 



Length. Male, 6 - 6.5 mm ; female, 4 - 6.5 mm. 



Hab. Bagdad Valley, Hobart, South Bridgewat«r. 

 (Probably generally distributed.) Also in New South 

 Wales and Victoria. 



Male. Eyes joined from the vertex to the antennse, 

 flattened in front, and somewhat sunk at the line 

 of junction. Proboscis and antennae black, the first 

 antennal joint more than three times the length 

 of the second, and» bearing extremely long, dense, 

 black hairs ; second joint extremely short, the third about 

 equal in length to the first two together. Thorax much 

 arched, velvet-black, with long, dense, yellow, upstanding 

 pubescence, and very short, golden, depressed pubescence. 

 Abdomen similarly coloured, and with similar pubescence 

 to that of the thorax. Legs entirely black. Wings tinged 

 with brown along the costal ma.rgin, the amount of brown 

 varying in different specimens; remainder of wing hya- 

 line ; the veinlet closing outwardly the discal cell is con- 

 spicuously waved ; halteres with stem whitish, kno;b black. 



Female resembles the male, but the eyes are well separ- 

 ated, and the posterior femora are pale brownish-yellow, 

 with only the apex black ; the middle femora may be either 

 yellow or black, the anterior femora always black. The 

 front is velvet-black, and the base of antennae surrounded 

 with silver}^ pubescence. 



This species varies very greatly in size, but may be easily 

 distinguished by the yellow and golden pubescence, the 

 brown-tinged wings, and the waved veinlet closing the dis- 

 cal cell. 



