Home | Stonefly Nymph Key | Species List | Bibliography | Glossary

Stoneflies - Plecoptera: Chloroperlidae of Gunnison County, Colorado
Sweltsa lamba Rheocrene Sallfly

(Needham and Claassen 1925)

Updated 16 Aug 2009


Older publications may refer to this stonefly as Alloperla lamba.

Good Links

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


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 180: "This species is most common in springs and streams near springs. The adults emerge from June to October. "

Duffield,RM and Nelson,CH 1998 Stoneflies (Plecoptera) in the diet of brook trout (Salvelinus fontinalis Mitchell) in Libby Creek, Wyoming, USA. Hydrobiologia 380, 59-65.
     Abstract: "The stonefly component of a naturally reproducing population of brook trout (Salvelinus fontinalis) was studied by analyzing 216 stomach pump samples collected between May 15 and August 10, 1991 and 1992, from Libby Creek, an alpine stream in the Medicine Bow National Forest in Wyoming. Stoneflies constituted 10.3% of the total items recovered and were the second most abundant order in the samples. Nineteen species of Plecoptera representing five families were identified. Approximately 43% of all stoneflies were Sweltsa lamba; the next most prevalent species was Zapada haysi (12%). The other prevalent insect orders in the samples were Diptera (57.2%), Ephemeroptera (8.4%) and Trichoptera (6.1%). Terrestrial Coleoptera, Hymenoptera, and Hemiptera were most common in July and August."

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: "The type locality for this species is Estes Park. It is the common Sweltsa of swall to medium-sized streams of the mountain and plateau region. It can also be collected in small rheocrenes along the Front Range at medium elevationss (1,600-2,000 m)."

Needham,JG and Claassen,PW 1925 A Monograph of the Plecoptera of North America. Entomological Society of America, Lafayette, Indiana. 397 pages.
     Described as Alloperla lamba on pages 115 and 116.

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

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

Brown,WS 2004 Plecoptera or Stoneflies of Gunnison County, Colorado