the Asllida) of Australasia. 419 



Erax caudatiis, Fabr., Syst. Antl. 171. 33 [Dasypogon] (IBO^j). See 



Kertesz, Cat. Dipt. p. 234 (1909), for further references. 

 Erax fiiscipennis, Macq., Dipt. Exot. i. {2) p. 22o. 

 Erax plantaris, Thorns., Eiigen. Kesa, Dipt. p. 4(J8 (18G9). 

 Ernx Salomon, Macq., I. c. p. 226. 

 Erax varymystaceu.s, Macq., Dipt. Exot. Suppl. ii. p. 56. 



No specimens of this genus are present in the Brit. Mus. 

 Coll. or Mr. Frenches Coll. 



Erax albiventris, Macquart. 



Type (a male) seen in Paris iMaseum, 12. 4. 11. 



A large species, distinguislied by tlie tomentose asfiy-grey 

 coloured sixth segment of abdomen, which is black, with 

 yellowish-grey tomentose lateral spots. 



Face broad, with a large tubercle. Moustache white, with 

 black bristles intermixed. Antennce black, the arista long, 

 almost the length of antenna, the first two joints with white 

 hairs. Legs stout, black ; the tibise red, the hind pair 

 broader on the apical half, with dense fulvous pubescence ; 

 the anterior femora with white hairs and no bristles, the 

 others with black bristles. Wings dilated, with an appendix. 



Macquart described it thus: — 



Black. Thorax with ashy-grey pubescence and black 

 stripes. Abdomen with broken silvery segmentations and 

 the last segment but one silvery ; underside white. Mou- 

 stache above black, below yellow. Tibiae testaceous. Wings 

 dilated. $ . PI. viii. fig. 4. 



Length 10 lines. $ . 



Palpi with black hairs. Beard white. Face with greyish- 

 white tomentum ; moustache yellowish, with black bristles 

 above and at sides. Forehead and antenna black. Thorax 

 with the intermediate stripe bordered by a white line ; sides 

 with ashy-grey tomentum, changing to brownish. Abdo- 

 men with white hairs at sides ; the second, third, and fourth 

 segments bordered posteriorly with a silvery-white colour, 

 widely interrupted in the middle, and comprising the whole 

 width of the segments near the junction of the arches ; fifth 

 on posterior border almost wholly white : sixth entirely dull 

 silvery white; seventh short, black, with a white spot on 

 each side of the anterior border ; underside white, with white 

 hairs; genital organs large, brown. Legs black, with white 

 hairs and black bristles ; tibiae testaceous, the anterior and 

 intermediate ones black at apex ; posterior pair a little 

 swollen towards the middle behind. Wings dilated on 

 external bordei", reddish grey. 



From the east coast of New South ^\'alcs. Paris Museum, 



