THE GENERA OF EASTERN NORTH AMERICAN 
CHLOROPERLIDAE (PLECOPTERA): 
KEY TO LARVAL STAGES* 
By Sandy B. Fiance 
Department of Entomology 
Cornell University 
Ithaca, New York 14853 
Considerable changes in the systematics of North American 
chloroperlid stoneflies have resulted from the elevation of sub- 
genera created by Ricker (1943) to generic status by lilies (1966) 
and Zwick (1973). Most significant are the new combination 
Rasvena tema, and the division of Alloperla (s. 1.) into five genera, 
only three of which occur in the region under study. Baumann 
(1974) separated the closely related species Alloperla imbecilla and 
A. atlanticum. Harper and Roy (1975) described the male of 
Utaperla gaspesiana, the first member of the Paraperlinae known 
from the Northeast, although Ricker (1952) found larvae from 
Tennessee that were referable to this subfamily. Hitchcock (1974) 
has summarized the status of members of the family found in 
Northeastern North America prior to 1971, and has provided spe- 
cies level keys for adults, but has retained the generic classification 
of Frison (1942). 
At present, the family Chloroperlidae is represented in Eastern 
North America by 24 species in two subfamilies and six genera 
(Table 1). Larval stages are known only from four of these 24 
species. This paper provides keys to genera of larvae needed be- 
cause of nomenclatural changes and description of new species. 
The larval stages of Suwallia marginata remain unknown. I have 
examined specimens of the Western North American species Su- 
wallia pallidula. These may be separated from Sweltsa by the 
relatively fewer setae of the fore and hind femora, and on the 
eighth tergite, as well as the fewer long setae present on the apical 
corona of subterminal cereal segments. 
* Manuscript received by the editor April 21, 1978. 
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