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DIPTERA OP AUSTRALIA, 
Sub-Section II — MYCETOBIX^. 
Anterior branch of the second longitudinal vein large, ending 
in the costa, and forming with the second longitudinal a fork 
having its base at or beyond the marginal cross-vein. Anterior 
branch of the fourth longitudinal vein and the third longitudinal 
vein issuing from the second longitudinal vein. Fifth longi- 
tudinal vein perfect. Inner marginal cell large. Surface of the 
wing hairy, or only microscopically pubescent. 
Genus 2. Mycetobia, Meig. 
1. Anterior branch of the second longitudinal vein and second 
longitudinal vein forming a fork having its base at the 
marginal cross-vein. Surface of the wings microscopically 
pubescent. 
Genus 3. Ditomyia, Winn. 
2. Anterior branch of the second longitudinal vein and second 
longitudinal vein forming a fork having its base beyond the 
marginal cross-vein. Surface of the wings hairy. 
a. Base of the fork lying before the base of the third 
sub-marginal cell. Costal vein extending beyond the 
tip of the second longitudinal vein. 
Genus 4. Plesiastina, Winn. 
b. Base of the fork lying beyond the base of the third 
sub-marginal cell. Tip of the costal vein uniting 
with the tip of the second longitudinal vein. 
Sub-Section III.— BOLITOPHILIN^. 
Genus 5. Bolitophila, Meig. 
Antei’ior branch of the second longitudinal vein short, lying 
almost vertically to the costa or to the first longitudinal vein, 
and forming with the second longitudinal vein a fork with a 
long petiole. From the second longitudinal vein, bent angularly 
in the vicinity of the root, issue the anterior branch of the fourth 
longitudinal vein and the third longitudinal vein. Fifth longi- 
