1947] 
Banks — Characters in the Perlidee 
279 
anal vein not angled or scarcely so near base; femora 
have distinct bristles among the shorter hairs. 
1. Pronotum in front fully twice as broad as long; head 
extending back of eyes for the length of an eye ; 
ocellar triangle twice as broad as long ; last joint of 
maxillary palpi very short; radial sector forked 
twice Calliperla 
Pronotum not so broad, head not extended so far back, 
ocellar triangle rarely twice as broad as long 2 
2. Maxillary palpi long and slender, the joints not broad- 
ened at tip ; radial sector usually forks twice. 
Diploperla 
Maxillary palpi shorter, one or two joints plainly 
thickened near tip; radial sector often forked but 
once Occiperla 
Calliperla gen. nov. 
Type : Perla luctuosa Bks. 
The ocellar triangle is twice as broad as long; hind 
ocelli nearer to eyes than to each other, head curving 
back of eyes more than length of eye. Ocellar line angu- 
late behind, the median groove very short. Palpi very 
long and slender. Femora with distinct longer bristles 
besides the short fringe. Pronotum more than twice as 
broad as long. In fore wing the subcosta ends at or near 
cord, radial sector usually forks twice, cubito-anal cross- 
vein at end of anal cell, first anal vein not angled ; in hind 
wing several cubital cross-veins. From base of anal cell 
in fore wings there is short, transverse anal brace, but 
no anal lobe ; antennae with several joints beyond the third 
much broader than long, with only minute erect hairs. 
Diploperla Frison 
This genus is based on D. (Perla) hilohata N. & C. 
This is a rather slender species in which the male shows 
a lobe on two ventral segments ( D . duplicata is similar). 
The other forms are rather more robust, and the male has 
but one ventral lobe. But for the present I will keep 
them together; they are modesta, verticalis , nona, tincta, 
sorpta and probably misnoma, alameda, cestivalis, and 
fulva. 
