1366 
DIPTERA OF AUSTRALIA, 
divided by three striae, beginning below the anterior margin and 
terminating before the sciitellum ; rather densely covered, more 
especially anteriorly, with a microscopic pale yellow pubescence ; 
pleurae, j>ectus, scutellum, and metathorax black, opaujue. 
Halteres pallid, the base of the stalk black, with a minute pale 
pubescence. Abdomen black, opaque, the third to the seventh 
segment with a square median patch of intense black, densely 
clothed with short hairs. Legs brownish-black, with a pale 
yellow pubescence, interspersed with longer hairs ; genua yellow ; 
metatarsus of the hind-legs nearly twice the length of the four 
following tareal joints, and longer than the tibise of the inter- 
mediate- or fore-legs. Wings longer than the entire body, 
hyaline, brownish at the root ; costal vein black, auxiliary and 
first two longitudinal veins sordid yellowish-brown ; third, fourth, 
fifth, and sixth longitudinal v'cins pale. Fir.st and second 
longitudinal combining with the costa before the tip of the 
fourth longitudinal vein ; tip of the costal vein nearer the apex 
of the wing than the tip of the anterior branch of the fork of the 
third longitudinal ; marginal cross- vein about as long as the 
petiole of the second sub-marginal cell. Wing-fold between the 
third and fourth longitudinal veins furcate before joining the 
posterior border ; wing-fold between the fifth and sixth longi- 
tudinal veins nearer the former, bent abiniptly forward at its 
tip, and joining the wing-border very close to the tip of the fifth 
longitudinal vein j sixth longitudinal vein complete. 
Hfjh. — Gosford and Berowra (8kuse). August and September. 
Genus 1. Bibio, Geoflf. 
Bihio, GeoflTroy, Ins. II. 1764, p. .571, 3 ; Hirtea, Fabricius, 
Zetterstedt, etc. ; Bibio, Meigen, Syst. Beschr. I. 1818, p. 309 ; 
Macquart, S. a B. Dipt. I. 1834, p. 177, etc. 
