Sweltsa durfeei, Kondratieff & Baumann, 2009

Kondratieff, Boris C. & Baumann, Richard W., 2009, A Contribution To The Knowledge Of Sweltsa Exquisita (Frison) And S. Occidens (Frison) And Description Of A New Species Of Sweltsa From The Northern Rocky Mountains, U. S. A. (Plecoptera: Chloroperlidae), Illiesia 5 (3), pp. 20-29 : 26

Sweltsa durfeei , sp.n.

( Figs. 1 , 18-25 , 27 )

Material examined. Holotype ♂, USA: Montana: Mineral Co., Van Ness Creek, Lolo NF, FR 7812, 2 miles off FR 250 ( Trout Creek Road ), south of Superior, 2 July 2008, R. Durfee . Paratypes: Idaho: Lemhi Co., Moose Creek, off Hwy 93, below Lost Trail Pass , 23 July 1979, B.P. Stark, K.W. Stewart and R.W. Baumann, 4 ♂, 8 ♀ ( BPSC, BYUC) . Montana: same locality as holotype: 18 June 2004, R.W. Baumann and B.P. Stark, 2 ♂, 4 ♀ ( BYUC) ; 2 July 2008, R. Durfee, 8 ♂, 15 ♀ ( BYUC, CSUC) ; Ravalli Co., tributary, Bear Creek , 6 July 1995, A.L. Sheldon, 4♂ ( BYUC) ; tributary, Gash Creek, Rd. 737, 24 July 1995, A.L. Sheldon, 5♂, 6♀ ( BYUC) ; Judd Creek , 14 June 1999, A.L. Sheldon, 2♂, 2♀ ( BYUC) ; Lick Creek , 31 July 1997, A.L. Sheldon, 1♂ ( BYUC) . The holotype will be deposited at the United States National Museum ( USNM) .

Male. Macropterous. Body length 8-9 mm; Forewing length 9-10 mm. General color light yellow in life, white in alcohol. Head yellow with black ocellar rings, pronotum with black lateral markings ( Fig. 1 ). Terga 1-8 with a wide interrupted black stripe middorsally that terminates in a narrow spot. Tergum 9 lacking elevated process ( Fig. 22 ). Epiproct erectile, elongate, in dorsal aspect, slightly constricted subapically, apex expanded ( Figs. 18 & 22 ); apex bare, caplike ( Figs. 18, 19 & 22 ), in lateral aspect, apex expanded, and club-like but not laterally flattened ( Figs. 20 & 21 ); in dorsal and lateral aspect, surface of epiproct covered with dense pile of long appressed setae, extending to near epiproct base ( Figs. 18-22 ), laterally, base bare ( Fig 18 ). Aedeagus tubular ( Fig. 23 ) lacking terminal lobes ( Fig. 24 ), surface with comb-like setae, distributed scale-like over surface ( Fig. 25 ).

Female. Macropterous. Body length 8-10.5 mm; forewing length 9-10.5 mm. General color and morphology similar to male. Subgenital plate extending only partially over sternum 9, outline subtriangular, apex narrowly rounded, sometimes with indented areas laterally ( Fig. 27 ).

Etymology. The patronym honors Richard S. Durfee, Pueblo West, Colorado. He collected the type material and many other valuable stonefly specimens that have been useful in our review of the stonefly fauna of western North America.

Figures

Fig. 1. Sweltsa durfeei, Van Ness Creek, Montana. 1. head and pronotum.

Figs. 18-25. Sweltsa durfeei, Van Ness Creek, Montana, male terminalia and aedeagus. 18. epiproct, dorsal; 19. epiproct, apex, dorsal; 20. epiproct, lateral; 21. epiproct apex, lateral; 22. terminalia, dorsal; 23. aedeagus and epiproct, lateral; 24. aedeagus, terminal; 25. spines, aedeagus surface.

Figs. 26-27. Female subgenital plate, ventral. 26. Sweltsa equisita, Fryingpan Creek, Washington; 27. Sweltsa durfeei, Van Ness Creek, Montana.