CECIDOMYIA. 1Y5 



Spantocera Winn. Three longitudinal veins, which are all sim- 

 ple (uot forked); the first close by the 

 costa, the second at some distance from 

 it, but reaching the margin of the wing- 

 before its tip (fig. 6). Hairs on the 

 surface of the wing scaly. Antenna? 

 filiform, 13-jointed, joints elongated, 



Spauiocera. 



cylindrical, with a short pubescence and 

 without verticils. 



Lasioptera Meig. Three longitudinal veins, the first and second 

 of which run very near the costa and are so closely approximated 

 as to be hardly discernible (fig. 7). 

 Wings rather short and broad. An- Fig> 7 * 



tennfe from 16 to 26-jointed ; joints 

 subglobular, sessile, with short verticils. 

 (The sub-genus Clinorhyncha Lw. has 

 been formed of the Lasiopterce, having 

 the mouth prolonged in a rostrum.) 



The considerable number of. species contained in the genus Ceci- 

 domyia Meig. and the great variety of their structure have made 

 a subdivision necessary. The following tabular arrangement of 

 the sub-genera now adopted has been extracted, with a few modi- 

 fications, from Mr. Winnertz's work, although the subdivision 

 itself is chiefly due to Mr. Loew. 



CECmOMYIA MEIG. 



I. Wings with three longitudinal veins, the third either forming 

 a fork (figs. 1, 2, and 4), or becoming more or less obsolete towards 

 the tip (fig. 3).* 



A. Cross-vein placed between the root and the tip of the first 

 longitudinal vein, as in figs. 1 3 : (in this section the cross-vein 

 is frequently almost obsolete.) 



Cecidomyia Loew. The second longitudinal vein reaches the mar- 

 gin of the wing a little before its tip (although in most cases 

 this distance is very short, as in fig. 1). Generally the same 

 number of joints in the antenna of the J 1 and 9; joints either 



* In examining the wings of the Cecidomyiae, care must be taken not 

 to mistake for a vein a longitudinal fold which generally exists between 

 the second and third longitudinal veins. 



