BY FREDERICK A A. SKUSE. 37 



la 1850 Prof, (then Dr.) Loew wrote a valuable monograph of 

 the European Cecidomyidie, and, rejecting the attempt of Rondani, 

 put another system in its place. He formed a number of sub- 

 genera well adapted to satisfy that want to make these divisions 

 into sub-genera, and not only that, but supplied further definitions 

 to each of them, by means of which the contained species might 

 again be divided and characterised, a necessary step to take on 

 account of the great difBculty naturalists otherwise would have 

 experienced in dealing with such a numerous family of small 

 insects. 



His main arrangement of tlie first section is as follows : — 



Genus 1. Cecidomyia, Meigen. 



A. With three longitudinal veins. 1. 



/■ Collare more or less overhanging or hood- Sub-genus, 



1 -^ shaped. Wings without iridescence... Hormomyia. 



\ Collare very slightly developed 2. 



^Transverse vein wanting or moderately 



\ oblique 3. 



\ Transverse vein so oblique that the second 

 ' longitudinal vein appears two-rooted 5. 



. Male with twice as many fiagellar joints 



J as the female Diplosis. 



\ Both se.xes with an equal number of an- 



M 



tennal joints 4. 



Antennae hair-whorled Cecidomyia. 



Antennaj with a short pubescence A sphondylia. 



Flagellar joints .sessile or almost sessile in 



both sexes Dirhiza. 



Flagellar joints pedicelled in both sexes... Epidosis. 



B. With four longitudinal veins Asi/napta. 



Genus II. Lasioi'teka, Meigen. 



Mouth prolonged in a rostrum Clinorhi/ncha 



Mouth not prolonged in a rostrum Lasiojjlera. 



