Family SYRPHID. 
The genera in the collection can be distinguished as follows :—- 
1 (46) Antenne short or of moderate length, 
not porrect, and not longer than the 
head ; if they are elongate, there are 
distinct macrochetz on thorax and 
scutellum. 
2 (21) Small ecross-vein before the middle of 
the discal cell; marginal cell always 
open. 
3 (20) Third antennal joint usually short, 
never linear, nor much longer than 
the two preceding joints together ; 
vena spuria well developed; thorax 
and scutellum without macrocheetee ; 
eyes of male usually touching. 
4 (19) Face not or but little produced below, 
without a snout-like projection : 
third longitudinal vein not curved 
backwards but depressed, ending at 
the tip of wing or before it; if 
this vein is curved backwards, the 
abdomen is stalked ; first and second 
longitudinal veins of usual length. 
5 (18) Abdomen of normal shape, neither 
tubular nor stalked; if it is a little 
constricted towards the base, the 
discal cell is much shorter than the 
subapical one. 
5 (9) Diseal cell much shorter than the sub- 
apical cell; face without a distinct 
tubercle and abdomen without yellow 
markings. 
(8) Fourth longitudinal vein prolonged to 
the hind border beyond the upper 
marginal cross-vein; face of a yellow 
colour, not hollowed above and 
without a prominent edge below 
8 (7) Fourth longitudinal vein at most 
forming a short stump beyond the 
upper marginal cross-vein ; face of a 
black colour, hollowed above and 
with a prominent edge below ...... 
(6) Diseal cell as long as the subapical, or 
if a little shorter, then the face 
provided with a distinct tubercle or 
the abdomen adorned with yellow 
spots or bands, 
~ 
“I 
ten] 
ParaGus, p. 11. 
CHRYSOGASTER, p. 15 
