148 THE ENTOMOLOGIST. 
Fig. 27.—Ptychoptera. 
Fig. 28.—Rhyphus. 
Fig. 29.—Sargus cuprarius. 
Fig. 30.—Nemotelus pantherinus. 
In Limnobia and in Limnophila (figs. 25, 26) it will be 
seen that the general arrangement of the wing-bones is like 
that of Dixa, and that the prebrachial is forked in Dixa and 
in Limnopbila, and is undivided in Limnobia. The numerous 
variations of these bones in Limnobia are considered as 
sections by Meigen, and as genera by more recent authors. 
