280 



BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



1 have endeavored to sum up our knowledge of the geograijhical dis- 

 tribution in the following table. It will, of course, be understood that 

 the data of the occurrence of genera (in their modern signification) in 

 Asia, Africa, and South America are yet meager, but I have given such 

 as I have been able to obtain. The occurrence of genera is indicated 

 by asterisks, which are replaced by figures when species are known to 

 be common. 



Tabular synopsis and (jeographtcal distribution of genera. 



Genera. 



r 1 " 



Microdon 



ChiyMOtoxum . .. 



Paragus. 



Nausigaster 



Pipiza. 



Psilotii 



Chr.vsogaster 



Chilosia 



Mplanostoma 



Pyropluena 



Piatychirus 



Leuciizona , 



CataUoiiiba 



Euiieotles 



Sviphus 



riiilea 



XaDtbogramma 



Alloj;riipta 



Mesojrrapta 



Spharoiihoria .. 



I'elecocera 



iCeoascia 



Sphegina 



Bacclia 



Chah^omyia 



Myiolopta 



P.hiDgia 



Eugeuiamyia... 



Brachyopa 



Volncella 



Copestyluiu 



SBriconiyia 



Arctopbila 



Eristalis , 



Dolio.syrphus . . , 



Pleroptila 



Helophilus 



Pterallastes 



Tcucl)ocnemi8.. 



Mallota 



Tnodonta 



Tropidia , 



C''i(>rliina 



Ciicpiora 



Pocota 



Brachypalpus . . 



Xylota 



Senogaster 



Syritta 



Ch rysochlamys 

 !Merai)ioidus ... 



Spiloiuyia 



'J'eiiiiio.->tonia . . . 



MiU'sia 



Sphecomyia 



Cfria 



4 

 1 



14 

 1 

 8 



14 



12 

 2 

 5 

 1 

 1 

 1 



23 

 2 

 5 

 2 

 5 

 8 

 1 

 2 

 4 



10 

 1 

 4 

 1 

 1 

 3 



18 

 1 

 6 

 1 



20 

 1 

 1 



19 

 1 

 2 

 3 

 1 

 3 



12 

 4 

 1 

 6 



21 

 1 

 1 

 4 

 1 

 C 

 G 

 1 

 3 

 6 



10 



1 i ? 



1 



18 



Total 304 



142 lOG 



