CLASS V. IXSEfTA. 



297 



sda (simple or slightly pliitnose) inserted beyond the dorsal junc- 

 tion of the second and third joints : head anteriorly distinctly rostri- 

 t'orm. 



Sp. 1. Erlst. Narcissi. 



Inhabits flowers in marshes. 



Genus 527. HELOPIIILUS. Leacfi. Elopiiiixs. Mcig., I/lig., 



Lair. 



Antennae contiguous at their base, their last joint l)roadcr than long; 

 sda (simple or slightly plumose) inserted l)eyond the dorsal juncture 

 of the second and third joints; head anteriorly distinctly rostritbrni. 



Sp. 1. Ilel. tenax. Latr., Leach. 



luliabits hedges, and is very connnon. I^Yi^^i^M^ 

 Genus 528. SYRPHUS ofaulhors. 



Antenna separate at their base, their last joint suborbiculate : seta in- 

 serted beyond the dorsal junction of the second and third joints: 

 abdomen elongate-subquadrate, gradually somewhat narrower to- 

 wards its extremity. 



8p. 1. St/r. Fyrastri. Fabr. 



Inhabits flowers. 



Genus 529. DOROS. Meig., llUg., Leach. 



Antennce separate at their base; their last joint suborbiculate: seta in- 

 serted beyond the dorsal juncture of the second and third joints : ab- 

 domen suljovate-trigonal ; the length double the breadth. 



Sp. 1. Doros conopscus. 



^lilesia conopsea. Fubr. 



Inhabits fields, but is very rare. 



SriRPS 2. — Head not anteriorly conic-produced : antenna; mvich longer 

 than the head, placed on a common elevation : oval catitjj on the 

 nasal prominence : nings defle.xed. 



Genus 530. CHRYSOTOXUM. Meig., Latr., Leach. 

 Aiitennce subcylindric, their last joint having a seta at its base. 

 Sp. 1. Chrys. arcuatum. 

 Musca arcuata. LinnL 

 Inhabits flowers. 



Genus 531. CERIA. Fabr., Latr., Illig., Meig., L.each. 

 Antenna with their first and second joints forming an oval mass termi- 

 nated by a style. 



There is one British species, that does not seem to have been de- 

 scribed. 



SriRPS 3. — Head not anteriorly produced : nasal part straight, not pro- 

 minent : antewKE inserted separately, very much longer than the 

 head: w/?jgs defle.xed. 



Genus 532. APHRITIS. Latr., Leach. Microdon. Meig. 



AntenncE with their third joint conic, elongate, its base bearing a seta. 



