NEUROPTERA— TRICHOPTERA— PHRYGANID^. 199 



the importance in generic churacteristication of the presence or absence of 

 specified apical cellules, of which the full complement in the anterior wing 

 is nine ; of these three belong to the area of the sector. In the present 

 genus we have an additional apical cellule in the field of the sector, one of 

 the ramules of the lower branch of the sector being divided. In all other 

 species of Phryganidaj proper, to which there can be no doubt that this 

 genus belongs, both the ramules extending to the margin from either side 

 of the cross-vein closing the discoidal cell are simple ; in Limnopsyche the 

 upper is branched, so that there exists an "apical fork" between the "first" 

 and "second" apical forks of McLachlan's terminology. This, howevei', is 

 not the only peculiarity ; the anastomosis is broken into three instead of, 

 as in true Phryganidte, two parts, the cross-vein uniting the sector and 

 cubitus lying far toward the tip of the wing, while the remainder of the 

 anastomosis has its normal place near the middle of the wing. Moreover, 

 the median cellule, which, as in other Phryganidae proper, is open, extends 

 nearly to the base of the wing, interrupting still more markedly the anas- 

 tomosis of the lower half of the wing. 



Although only a portion of the neuration can be determined in the 

 single pretty large species referred here, this differs so much from the exist- 

 ing genera of true Phryganidse that its separation from them is indispen- 

 sable. 



Limnopsyche dispersa. 



PI. 13, Fig. 2. 



There are three specimens provisionally referred to this species, but in 

 only one can the neuration be traced sufficiently, and it is upon this, which 

 is figured, that the species is founded. It shows a dorsal view with indis- 

 tinct traces of different appendages, but with the wings of one side ex[)anded. 

 Especially tliis is true of one ; it is an upper wing, but toward the lower 

 margin a portion of the hind wing, crumpled and folded, is more or less 

 mixed with it, so that the figure is not perfectly clear or pi'obably correct 

 at this point. The main features of the neuration have been pointed out in 

 the description of the genus, but a few special points may be added. Tlie 

 wing is about two and a half times longer tlian broad, the costal margin 

 well rounded, bringing the rounded apex down nearly to the middle of the 

 wing, the lower margin (apparently) full. It is pale brown without mot- 



