INSECTA. 327 



B. Antennae shorter than head. 



t Proboscis moderate. 



a) Wings congruous, parallel, incumbent. 



Milesia LATR., FABR. Antennas with naked dorsal seta. Nasal 

 tubercle none. Abdomen mostly elongate, narrow. 



Eumerus nob. (JSumerus MEIG., Xylota ejusd., Ascia ejusd., 

 Sphegina ejusd., Merodon ejusd.) Hinder thighs incrassated, spinose 

 beneath. 



Sp. Milesia (Xylota MEIG.) pipiens, Musca pipiens L., PANZER Deutschl. Ins. 

 Heft 32, No. 29, SCHELLENBERG, Tab. x. figs. 3, &c. 



Milesia MEIG. (Pipiza, Psilota ejusd.) Feet simple; posterior 

 thighs little or not at all thicker than anterior. 



Triglyphus LOEW. (OKEN'S Isis, 1840, p. 565.) 



Syrphus LATR. Antennas with dorsal seta naked or downy. 

 Nasal tubercle. 



* With abdomen elongate, attenuate anteriorly, clubbed at the apex. 

 Sub-genus : Baccha MEIG. 



* * With abdomen oval, depressed. 



Sub-genera : Chrysogaster MEIG., and Syrphus ejusd. 



Sp. Syrphus pyrastri, Musca pyrastri L., DUMERIL Cons. gen. s. 1. Ins. PI. 50, 

 fig. 10 ; Syrph. ribesii, Musca ribesii L., Cuv. R. Ani. 3d. ill., Ins. PI. 174, 

 figs. 6, &c. 



This pretty family of flies, mostly adorned with yellow transverse bands, 

 often continue hovering in the air in the same place, moving their wings 

 with very rapid vibrations, and producing a peculiar hum in a high 

 note. Their larvae, conical and pointed forwards, feed on plant-lice. See 

 GOED.ERDT Metamorphosis naturalis, Medioburgi, ismo, I. p. 99, Observ. 47, 

 KEAUMUR Ins. in. PI. 30, &c. 



Note. Sub-genus Platycheirus SAINT- FARG. and SERV., with anterior tarsi 

 dilated in the male. Comp. STAGER in KROTER'S Naturhist. Tidsskr. IV. 

 1843, P- 32i. 



Sericomyia MEIG. Antennae with plumed dorsal seta. Nasal 

 tubercle. 



b) Wings congruous, divaricate or deflected. 



Helophilus MEIG. (with the addition of several species of genus 

 Eristalis ejusd. and Mallota ejusd.) Antennae with dorsal seta 

 naked or downy. Abdomen oval or conical. 



