142 THOMAS SAY FOUNDATION 
PLATE 9 
FIGURES 135-152 
135-140 Taeniopteryx nivalis Fitch 
141-146 Nemoura venosa Banks 
147-152 Leuctra sibleyi Clsn. 
All three species are herbivores. The labrum is long and narrow, 
the mandibles have short, blunt teeth, a large molar and below 
this a ‘‘comb’’ of stout hairs; the ligula is four-lobed and the 
suture between the glossae does not extend to the mentum; the 
galea is stout; the lacinia bears two small terminal teeth and 
the suture separating the lacinia from the stipes is only par- 
tially indicated. 
