296 MODERN SYSTEM. 



Fam. XL Acroceridx. Leach. 

 Inflata. Latreille. 



Body short as if inflated : wings divaricating : antcnme three- or tw^o- 

 joiated. 



b. Proboscis (a hen at rest) ret?-actile within the aivitij of the mouth. 



Genus 521. ACROCERA. Meig., Latr., Leach. 

 Proboscis obscure : antenna inserted on the vertex ; two-jointed, the 

 last joint terminated by a seta. 

 There is a Eiitish sj)ecies of this genus. 



Genus 522. OGCODES. Lutr., Leach. Ilr.jcops. I/iig., Walck., 



Meig., Fabr. 

 Proboscis obscure : antennce inserted anteriorly over the cavity of the 



mouth; two-joiutcd, the la^t joint terminated by a seta. 

 Sp. 1. Og. gibbosus. Latr., Leach. 

 Inhabits Germany and England. 



Lam. XII. SyRPiiiDJ,. Leach. 

 Syrphix. Latreille. 



B. Huustellum iciih two seta. 



Stirps 1. — Head anteriorly conic-produced: antenna much shorter 

 than the head, placed in a common elevation : oval cavity on the 

 nasal prominence : wings divaricating. 



Genus 52."). RIIIXGIA of authors. 

 Head anteriorly much produced, terminated by the proboscis. 

 Sp. ]. llhin. n>S('r«te of authors. 

 Inhabits tlowers. 



Genus 524. SERICOIMYIA. Latr., Leach. 

 Antenna: w'lih their seta' plumose, inserted at the dorsal juncture of the 



second and third joints; the last joint of the antenna suborbicular. 

 Sp. 1. Scr. Luppomim. Latr., Leach. 

 Inhabits marshes, especially the bogs of Dartmoor, and the north of 



England, Scotland, and Ireland. 



Genus 525. VOLUCELLA. Geoff., Schaff., Latr., Leach. Pte- 



ROCERA. Meig. 

 ^rtienK(E with' their last joint elongate; seta plumose, inserted at the 



dorsal juncture of the second and third joint. 

 Sp. L Vol. pellucens. Latr., Leach. 

 Inhabits woods in June and July. 



Genus 520. ERISTALIS. Latr., Fabr., Leach. IIeliopiiilvs. 



Meig., Illig. 

 Antenna contiguous at their base, their last joint broader than long ; 



