284 Psyche [Dec - 
Contains also montana Bks. and marlynia N. & C. 
Perliola gen. nov. 
Type : Isoperla 5-punctata Bks. 
In this the cubitus forks as in typical Isoperla, but the 
femora are usually thicker (front pair) and with more 
numerous hairs and among them longer bristles ; the ocelli 
are small, the lateral boss about as large and almost as 
far from hind ocellus as from the base of antenna; 
median groove present and usually visible. The maxil- 
lary palpi are short, the second and third joints at least 
rather thick; the joints of antennae though much longer 
than broad are not as long as in Isoperla , and the hair is 
usually shorter. There are several species in the West- 
ern States, one with much resemblance in subgenital plate 
to Isoperla sobria Hag. 
Subfamily Perlestinae 
The three genera in our fauna are separable as follows. 
1. A series of costal cross-veins (five to ten or more) 
before end of subcosta; head broader behind than 
long; no cross-veins connecting anal veins beyond 
cell; three ocelli; first anal ends before origin of 
radial sector Perlesta 
First anal vein usually ends about as far out as origin 
of radial sector ; rarely more than one or two costal 
cross-veins before end of subcosta; head sometimes 
as long as broad; often one or more cross-veins in 
anal field 2 
2. With but two distinct ocelli ; rarely with more than one 
or two cross-veins between first and second anal 
veins; front femora about equal to width of pro- 
notum Atoperla 
With three ocelli; usually three or more cross-veins 
connecting first and second anals ; front femora not 
as long as width of pronotum Perlinella 
Subfamily Neoperlinse 
There is but one genus, Neoperla , in the U. S., others 
with many species occur in tropical areas and in East 
Asia. 
