1947] 
Banks — Characters in the Perlidce 
285 
Subfamily Acroneurinae 
The numerous species of this subfamily are placed in 
Acroneuria, Claassenia, Eccoptura , Beloneuria , and Hes- 
peroperla. 
Subfamily Perlinae 
The few genera, Perla, Togoperla, Banksiana , Har- 
risiola, have been separated by Klapalek and others; it 
is necessary to distinguish the female of Harrisiola from 
Perla {Togoperla) . In Harrisiola (both sexes) the oc- 
cipital line ends on the outer end of the lateral boss, in 
Perla the line does not bend forward so far, but runs 
toward the eye, well behind the boss. Perla has a tiny 
last joint to maxillary palpi. 
Subfamily Kathroperlinae 
We have in America but the typical genus which occurs 
in British Colombia and adjacent areas. There are other 
genera in Formosa and China. 
Subfamily Chloroperlinae 
The four genera, Paraperla, Alloperla , Chloroperla, 
and Hastaperla, were tabulated by Frison in 1942. 
Subfamily Peltoperlinee 
So far all the forms have been kept in the one genus 
Peltoperla , but P. cora will doubtless become at least a 
subgenus. 
