Family SYRPHID.E: 



The genera in the collection can be distinguished as follows : 



1 (46) Antennae short or of moderate length, 



not porrect, and not longer than the 

 head ; if they are elongate, there are 

 distinct macrochaeta3 on thorax and 

 scutellura. 



2 (21) Small cross-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 macrochoetie ; 

 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 

 discfll cell is much shorter than the 

 subapical one. 



6 (9) Discal cell much shorter than the sub- 



apical cell ; face without a distinct 

 tubercle and abdomen without yellow 

 markings. 



7 (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 . . PARAGUS, p. 11. 



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 CHKYSOGASTKB, p. 15 



9 (6) Discal 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. 



