INSECTA. oot 
B. Antenne shorter than head. 
+ Proboscis moderate. 
a) Wings congruous, parallel, incumbent. 
Milesia Latr., Fase. Antenne with naked dorsal seta. Nasal 
tubercle none. Abdomen mostly elongate, narrow. 
Humerus nob. (Humerus Muic., Xylota ejusd., Ascia ejusd., 
Sphegina ejusd., Merodon ejusd.) Hinder thighs incrassated, spinose 
beneath. 
Sp. Milesia (Xylota Muta.) pipiens, Musca pipiens L., PANzER Deutschl. Ins. 
Heft 32, No. 29, SCHELLENBERG, Tab. x. figs. 3, &e. 
Milesia Mute. (Pipiza, Psilota ejusd.) Feet simple ; posterior 
thighs little or not at all thicker than anterior. 
Triglyphus Lornw. (OKEn’s Isis, 1840, p. 565.) 
Syrphus Latr. Antenne: with dorsal seta naked or downy. 
Nasal tubercle. 
* With abdomen elongate, attenuate anteriorly, clubbed at the apex. 
Sub-genus: Baccha Mete. 
** With abdomen oval, depressed. 
Sub-genera : Chrysogaster Mric., and Syrphus ejusd. 
Sp. Syrphus pyrastri, Musca pyrastri L., DuméR1L Cons. gén. s. 1. Ins. Pl. 50, 
fig. 10 ; Syrph. ribesti, Musca ribesti L., Cuv. R. Ani, éd. ill., Ins. Pl. 174, 
figs. 6, &e. 
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 larve, conical and pointed forwards, feed on plant-lice. See 
GorDa&Rpt Metamorphosis naturalis, Medioburgi, 12mo, I. p. 99, Observ. 47, 
Reavumour Jns. 1. Pl. 30, &e. 
Note.—Sub-genus Platycheirus SAint-F arc. and SERv., with anterior tars? 
dilated in the male. Comp. SrmcER in Kroyer’s Naturhist. Tidsskr. rv. 
1843, p. 321. 
Sericomyia Meta. Antenne with plumed dorsal seta. Nasal 
tubercle. 
6) Wings congruous, divaricate or deflected. 
Helophilus Mute. (with the addition of several species of genus 
Eristalis ejusd. and Mallota ejusd.) Antenne with dorsal seta 
naked or downy. Abdomen oval or conical. 
