Stoneflies - Plecoptera:Chloroperlidae of Gunnison County, ColoradoAlloperla severa(Hagen) 1861Western Sallfly Updated 6 Oct 2011
DescriptionAdults are bright green, no abdominal stripe.Life HistoryAdults emerge from May to SeptemberLocations CollectedWidespread in Western North America, medium to small rivers. Recent research (Baumann and Kondratieff, 2008) restricts this species to the northern portion of North America. Our local species are likely to be Alloperla thalia.NotesThe genus Alloperla was previously included in Perla. Older publications may refer to this species as Perla severa.Good LinksOn this website:Key to Alloperla females Key to Alloperla males Comparison of the two local species of Alloperla Alloperla pilosa Other Websites: Map - Kondratieff, Boris C. and Richard W. Baumann (coordinators). 2000. Stoneflies of the United States. Jamestown, ND: Northern Prairie Wildlife Research Center Online. (Version 12DEC2003). http://www.npwrc.usgs.gov/resource/distr/insects/sfly/usa/287.htm Adult Photo - Alloperla sp. from the Tree of Life http://tolweb.org/tree/eukaryotes/animals/arthropoda/hexapoda/plecoptera/slideshows/pleco1/sld033.htm Photos, Map, Museum specimens, DNA - Barcodinglife.org ReferencesBaumann,RW, Gaufin,AR and Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208."Discussion. - This species is common in creeks in the Rocky Mountain region. The adults emerge from May to September." Figure 484 Male terminalia, dorsal view, Figure 485 Male terminalia lateral view, Fihure 486 female terminalia ventral view on page 169. Baumann,RW and Kondratieff, BC 2008 The Alloperla severa complex (Plecoptera: Chloroperlidae) of western North America. Illiesia 2008 4(6):66-75. PDF The authors split A. severa into three species A. severa, A. elevata and A. thalia. A. severa is restricted to northern North America. Alloperla thalia is present in Colorado and may be the species we have been calling A. severa. 
Hagen,HA 1861 Synopsis of the Neuroptera of North America with a list of South American species. Smithsonian Miscellaneous Collections 4, 1-344. Described as Perla severa. Hagen's Glossary (pdf) 
Kondratieff,BC and Baumann,RW 2002 A review of the stoneflies of Colorado with description of a new species of Capnia (Plecoptera: Capniidae). Transactions of American Entomological Society 128 3, 385-401. "Alloperla severa is a widespread western North American species that can be collected in small numbers from medium sized streams to small rivers in the mountain region of Colorado." Lyon,ML; Stark,BP 1997 Alloperla (Plecoptera: Chloroperlidae) of western North America. Entomological News 108 5, 321-334.
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