50 AN ACCOUNT OF BRITISH FLIES. 



He makes three genera in A ; viz., (i.) Cecidoiuyia, (ii.) Spaniocera^ 

 and (iii.) Lasioptera. The first he divides into several sub-genera. 



(i.) Cecidomyia* 

 Antennce long and moniliform, or cylindrical ; generally verti- 

 cillate, 13-36 joints. Wings always very hairy, and have densely 

 pubescent margins. Three or four longitudinal veins. There are 

 two types of wings. In the first type the third vein is forked, thus 

 representing the third and fourth veins, which have united for most 

 of their length. In some rare cases this fork may become obliter- 

 ated. In the second type of wing the four veins are separate and 

 simple. We must note in these insects a curious longitudinal fold 

 between the second and third longitudinal veins, present in most 

 Cecidomyidae. 



(ii. ) Spaniocera, Wtz. •= Brachyneiira^ Rd. 



Antennce filiform, having no verticils, and composed of thirteen 

 joints. Wings covered by scaly hairs. There are three longitudinal 

 simple veins, the first running parallel to and close to the costa. 

 The other two widely separate (Fig. 9A). 



(iii.) Lasioptera, y[g. = Lasiopteryx, Steph. 



Antennce composed of 16-26 joints, each joint being sub-globular, 

 with short verticils. The three longitudinal veins not so easily seen 

 as in the above genus ; the first and second run close together, and 

 near the costa. There is a large space between the second and third 

 vein (Fig. 10 a). Proboscis short. 



The following is a short description of the sub-genera of Ceci- 

 domyia : 



r- -J • T ( Dasy?ieura, Rd. 



Cecidoi/iyia, Lw. = •' -^ ' 



( Rhabdophaga, Westw. 



Same number of joints in the $ antenna as in the ? . The joints 

 may be pedicelled or sessile. The second longitudinal vein reaches 

 the margin of the wing before its tip (Fig. ia). 



7T^7 ■ T ( Phytophaga, Rd. 



Diplosis, Lw. = 1' -> r i^ ■: 



\ Bremia, Rd. 

 The antenna of (^=26 to 27 joints; that of the $ = 14 to 15. 

 The joints are pedicelled. The second longitudinal vein reaches 

 the margin beyond the tip. The joints of the antennce of the $ 

 double the number of those of ? (Fig. 2a). 



* As far as I can make out, there seems to be a great division of opinion as to 

 what the genus Cecidoiuyia is to mean ; Meigen, Latreille, Macquart, Zetterstedt, 

 and Walker, holding one opinion ; Loew, Rondani, Westwood, Winnertz, 

 O.-Sacken and Schiner, another. Taschenberg describes the genus as having sub- 

 costal and cubital veins plainly separable ; postical vein forked. 



