1132 
DIPTERA OF AUSTRALIA, 
costal cross-vein situated a little before the apex of the inner 
marginal cell. Marginal cell very small, nearly square. Third 
longitudinal fork almost sessile. Second posterior cell small, its 
base situated almost under the middle of the third sub-marginal 
cell. Fifth longitudinal vein incomplete. Surface of the wings 
microscopically pubescent. Abdomen of the ^ with seven segments. 
Genus 18. Lasiosoma, Winn. 
Costal vein extending far beyond the tip of the second longitu- 
dinal vein, but not as far as the apex of the wing. Auxiliary 
vein terminating in the costa far beyond the small marginal cell. 
Fork of the third longitudinal vein long, sessile, or its petiole veiy 
short. Base of the second po.sterior cell situated far beyond the 
base of the third sub-marginal cell. Inner marginal cell short. 
Surface of the wing more or less distinctly pubescent. 
Genus 19. Empalia, Winn. 
Costal vein as in Lasiosoma. Auxiliary vein ending in the 
costa over the greatly shortened marginal cell. Fork of the third 
longitudinal vein with a moderately long petiole. Base of the 
second posterior cell nearer the root of the wing than the base of 
the third sub-marginal cell. Surface of the wing microscopically 
pubescent. 
Genus 20. Apolephtuisa, Grz. 
Costal vein as in Emj)alia. Auxiliary vein ending in the costa 
befoi’e the middle of the marginal cell; without sub-costal cross- 
vein. Petiole of the third suV>marginal cell about one-third the 
length of the fork. Marginal cell twdce as long as Vjroad. Base 
of the second posterior cell situated before the base of the third 
sub-marginal cell. Surface of the wing microscopically pubescent. 
Abdomen with seven segments. 
Genus 21. Tetragoneura, Winn. 
Costal vein as in the two preceding genera. Auxiliary vein 
small, bent posteriorly, ending in the first longitudinal vein far 
before the marginal cell, or shortened to a tooth. The marginal 
