298 MODKRX SYSXr.M. 



Tarn. XL Acrocerid.t.. Leach. 



l.M LATA. Latreilk. 



Body .short as if inflated : uiui^s divaricating : untemuc tlirce- or two- 

 jointed. 



b. Proboscis (when at rest) retractile uithin the airitij of the mouth. 



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

 Proboscis obscure : antenna; inserted on tlic vertex ; t^vo-jointed, the 

 last joint terminated by a seta. 

 There is a British species of this genus. ^\ili-tj0 



Genus 522. OGCODES. Latr., Leach. IIenops. //%., Wakk., 

 2Icig., Fair. 

 Proboscis ol)scure : antenna: inserted anteriorly over the cavity of tlic 



mouth ; two-jointed, the last joint terminated by a sela. 

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

 Inhabits Germany and England. 



Fara. XIL Svri'hid.t:. Leach. 

 Syrphix. LMtrcille. 



B. Haustellum uith two selcc. 



Stirps 1. — Head anteriorly conic-produced : antennae much siiorter 

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

 nasal prominence : uings divaricating. 



Genus 523. RHINGIA of authors. 

 Head anteriorly much produced, terminated by the proboscis. 

 Sp. 1. Lihin. rostrata of authors. 

 Inhabits flowers. 



Genus 524. SERICOMYIa! LMtr., Leach. 

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



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

 Sp. 1. Her. l^pponwn. Latr., Leach. 

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



England, Scotland, and Ireland. 



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



^ ROCERA. Meig. 



yl/iien?i<E with their last joint elongate ; seta plumose, inserted at the 



dorsal juncture of the second and third joint. 

 Sp. 1. Vol. pell ucens. Latr., Leach. 

 ^ Inhabits woods in June and July. 



Genus 52G. ERISTALIS. Latr., Fabr., Leach. IIeliopiiilis. 

 Meig., I/lig. 

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



