CLASS V. INSECTA. 
297 
seta (simple or slightly plumose) inserted beyond the dorsal junc- 
tion of the second and third joints : head, anteriorly distinctly rostri- 
form. 
1- Erist. Narcissi. 
Inhabits flowers in marshes. 
Genus .327. IIELOPHILUS. Lcacli. Elopiiilus. Mcig., Illig., 
Latr. 
Antenna contiguous at their base, their last joint broader than long; 
seta (simple or slightly plumose) inserted beyond the dorsal juncture 
of the second and third joints; head anteriorly distinctly rostriform. 
®P- 1. H cl. Umax. Latr., Leach. 
Inhabits hedges, and is very common. 
Genus 523. SYRPIiUS of authors. 
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. 
Sp. 1. Syr. Pyrastri. Fabr. 
Inhabits flowers. 
Genus 529. DOROS. Meig., Illig., Leach. 
Antenna: separate at their base; their last joint suborbiculate: seta in- 
serted beyond the dorsal juncture of the second and third joints : ab- 
domen suliovate-trigonal ; the length double the breadth. 
Sp. 1. Doras conopsens. 
^lilesia conopsca. Fabr. 
Inhabits fields, but is very rare. 
SrtRPs 2. — Head not anteriorly conic-produced : antenna much longer 
than the head, placed on a common elevation : oval cavity on the 
nasal prominence : wings deflexed. 
Genus 530. CHRYSOTOXUM. Meig., Latr., Leach. 
Antenna subcylindric, their last joint having a seta at its base. 
bp. 1. Chrys. arcuutlim. 
^lusca arcuuta. Limit. 
Inhabits flowers. 
Genus 531. CERIA. Fabr., Latr., Illig., Meig., Leach. 
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. 
Stirps 3. — Head not anteriorly produced: nasal part straight, not pro- 
minent : antenna inserted separately, very much longer than the 
head : wings deflexed. 
Genus 532. APIIRITIS. Latr., Leach. MrcaoDON. Meig. 
Antenna with their third joint conic, elongate, its base bearing a seta. 
