REPORT OF THE STATE ENTOMOLOGIST I907 243 



as already explained in the part preceding; these also differ from 

 all others of the tribe in that the first apparent fork of the sector 

 is skewed upward and the second downward. The shifting of vein 

 M^ upon the median cross vein after the atrophy of its own basal 

 deflection occurs in Mesocyphona and Dasyptera (subgenus of Rhy- 

 pholophus), in Gonomyia and Trimicra. Outside the tribe this oc- 

 curs also in at least two species of Dicranomyia and in Elliptera 

 and ThaumastopteraJ. Sc- shows all stages of progress in reces- 

 sion from the tip, and Sc as a whole, and with it R^, tend to shorten 

 in Gonomyia and its allies. There is a marked convergence toward 

 the wing apex of the tips of most of the veins in the more typical 

 Eriopterini. 



The Anisomerini constitute a little group that has been set apart 

 on the reduced number of antennal segments (6-10). In venation 

 it shows in the genus Anisomera marked range of variability in 

 the number of branches of the median vein. The most marked 

 venational peculiarity of tlie tribe seems to be the wide forking of 

 the cubital vein at an unusually remote point, far outward toward 

 the wing margin. Penthoptera, here figured for the first time, is 

 perhaps as generalized as any member of the tribe. In all, the 

 radial sector is three branched and typical, and Sc- remains near 

 the tip of the vein. 



The Limnobiini have the radial sector reduced to two branches, 

 and likewise, the median vein, and the cross vein 111 is preserved. 

 There are a few^ freakish forms included, as plate 18 testifies, but 

 in the main the tribe is one of the most homogeneous. As in Cylin- 

 drotomini the median vein is strongly deflected forward at its first 

 fork. 



The Antochini is the tribe that contains the extremes of most 

 venational phenomena, the extreme recession of the deflected base 

 of Cu^ and of the Media in Diotrepha, the extreme reduction of 

 the radial sector in Toxorrhina, and of the angulation of the anal 

 angle of the wing in Antocha etc. Many of the genera are loosely 

 associated. 



Many further details of venation applying to groups of genera 

 or to single genera will be found in the key which follows. I have 

 prepared this key based on venation not because I think the vena- 

 tion more important than other structures, but because it may be 

 a means for the communication of some further data, and because 

 I am convinced that some of the best systematic characters which 

 venation offers have been hitherto untjsed. It should be borne in 



