296 
MODERN SYSTEM. 
Fam. XI. Acroceridx. Leach. 
Inplata. LatreUle. 
Body short as if inflated : wings divaricating : antenna three- or two- 
jointed. 
b. Proboscis ( when at rest ) retractile within the cavity of the mouth. 
Genus 521. ACROCERA. Meig., Latr., Leach. 
Proboscis obscure : antenna inserted on tire vertex ; two-jointed, the 
last joint terminated by a seta. 
There is a British species of this genus. 
Genus 522. OGCODES. Latr., Leach. IIenops. IUig., IValck 
Meig., Fabr. 
Proboscis obscure : antenna inserted anteriorly over the cavity of the 
mouth; two-jointed, the last joint terminated by a seta. 
Sp. 1. Og. gibbosus. Latr., Leach. 
Inhabits Germany and England. 
Fam. XII. Syiumiidt.. Leach. 
Sykphix. Latreille. 
B. Haustellum with two seta. 
Stikps 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 523. RIIINGIA of authors. 
Head anteriorly much produced, terminated by the proboscis. 
Sp. 1. Rhin. rostrata of authors. 
Inhabits flowers. 
Genus 524, SERICOMYIA. Latr., Leach. 
Antenna with their sets plumose, inserted at the dorsal juncture of the 
second and third joints; the last joint of the antenna; suborbicular. 
Sp. 1. Ser. Lapponum. 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- 
bocera. Meig. 
Antenna with their last joint elongate ; seta plumose, inserted at the 
dorsal juncture of the second and third joint. 
Sp. 3. Vol. pcllucens. Latr., Leach. 
Inhabits woods in June and July. 
Genus 526. ERIS PALIS. Latr., Fabr., Leach. IIelxophJII®' 
Meig., IUig. 
Antenna contiguous at their base, their last joint broader than long', 
