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Stoneflies - Plecoptera: Chloroperlidae of Gunnison County, Colorado
Sweltsa fidelis - Mountain Sallfly

Banks 1920
Updated 30 April 2014
TSN 103286


Sometimes brachypterous (short-winged). Male epiproct indistinguishable from Sweltsa revelstoka, however female subgenital plates are very different. Nymphs were described in 2005, see Stark and Stewart.


Since this species suffered a name change, older publications may refer to this species as Alloperla fidelis.

Good Links

On this website:
Introduction to Sweltsa
Key to Chloroperlidae Nymphs
Key to Chloroperlidae Males
Key to Chloroperlidae Females


Banks,N 1920 New Neuropteroid insects. Bulletin of the Museum of Comparative Zoology. 64: 299-362.
     Described as Alloperla fidelis.

Baumann,RW, Gaufin,AR and Surdick,RF 1977 The stoneflies (Plecoptera) of the Rocky Mountains. Memoirs of the American Entomological Society 31, 1-208.
     Quote from page 179: "This species is abundant in creeks and rivers in the Pacific Northwest. The adults emerge from May to September. "

Delk,JK; Kilgore,MJ; Stark,BP 1998 Comparison of the epiproct structure of two closely related species, Sweltsa fidelis (Banks) and S. revelstoka (Jewett) (Plecoptera: Chloroperlidae). Great Basin Naturalist 58(3) 282-284.

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.
     Quote from page 394. "This species occurs in mountain streams, but is not as commonly collected as S. coloradensis or S. lamba. Delk et al. (1998) indicated that males of S. fidelis can not be reliably distinguished from S. revelstoka(Jewett). The latter species is not known from Colorado. "

Stark,BP; Stewart,KW 2005 Nymphs of four western nearctic Sweltsa species (Plecoptera: Chloroperlidae). Transactions of American Entomological Society 131 1+2, 189-200.
     Describes characters used to distinguish nymphs of Sweltsa fidelis from S. revelstoka. Has drawings and scanning electron photographs of various little body parts.

Surdick,RF 1985 Nearctic Genera of Chloroperlinae (Plecoptera:Chloroperlidae). University of Illinois Press, Urbana, IL. 146 pages.

Surdick,RF 1995a New western nearctic Sweltsa (Plecoptera: Chloroperlidae). Proceedings of the Entomological Society of Washington 97 1, 161-177.

Brown,WS 2004 Key to the Stoneflies of Gunnison County, Colorado