1368 
DIPTERA OF AUSTRALIA, 
commonly upon fruit-trees and on flowers. Sometimes called 
“garden-flies.” The genus is of world-wide distribution. 
174. Bibio imitator, Walker. (PI. xxxix., flg. 2, ^). 
Bihio imitator and ^), Walk., Entom. Mag. II. 1835, 
p. 470; B. fuhipennis {$) and B. mficoxis (9), Macquart, 
Bipteres Exotiques, 4th Suppl. 1850, p. 17, Nos. 10 and 11 ; 
B. helioscops {^), Schiner, Diptera der Novara-Expedition, 
Zool. Theil, Band II. p. 20, No. 8. 
(J. — Length of antemue 0'025 inch 
Expanse of wings 0*220 x0'075 
Size of body 0*270 x 0 055 
0*62 millimetre. 
5*58 X 1*89 
6*85 X 1*39 
9. — Length of antenme 0*030 inch 
Expanse of wings 0*290x0*110 
Size of body 0*285 x 0*070 
0*76 millimetre. 
7*35 X 2*79 
7*22 X 1*77 
(J. — Antennae much shoiter than the head, moderately robust, 
dull black, 2- 8-jointed, densely covered with a minute pubes- 
cence, which has an almost hoary reflection in a certain light. 
Head, ocelli, and palpi black ; the former as wide as the thorax. 
Eyes black (or having a dull cupreous-red appearance after 
death), beset with minute black hairs. Thoi’ax black, nitidous, 
densely covei’ed with golden-yellow hairs ; line dividing the 
collare and mesothorax, towards the humeri, and posterior 
margin between the scutellum and origin of the wings, tinged 
with ochraceous (this colour is not so distinct or scarcely per- 
ceptible in some specimens) ; scutellum rather densely covered 
with golden-yellow hairs. Halteres ochraceous. Abdomen 
flattened, at the base about the width of the thorax, twice the 
length of the latter, sub-linear, black, opaque, nitidous between 
the segments, clothed with pale yellow hair.s, the latter most 
numerous on the first two segments ; forceps not the width of the 
