Alloperla caudata Frison

Alloperla caudata Frison, 1934:27 .

Holotype ♂ (Illinois Natural History Survey), Adair Co., Oklahoma Alloperla caudata: Surdick, 2004:13 . Redescription and distribution update

Alloperla caudata: Baumann & Kondratieff, 2009:100 . SEM of epiproct

Images prepared by M.H. Lyon from the following material are in the Stark collection; additional images prepared recently from Mississippi specimens are very similar to those presented by Baumann & Kondratieff (2009).

Material examined. AL: Colbert Co., Henson Creek, Hwy 49, 5 June 1985, S.C. Harris, 2 ♂, 4 ♀ (BPS) . MO: La Clede Co., Brush Creek, Hwy PP, date not given, B.C. Poulton, 3 ♂ (BPS) . MS: Tishomingo Co., Clear Creek, Hwy 172, 18 May 2009, B. Stark, 19 ♂, 14 ♀ (BPS) . OK: Cherokee Co., Barron Fork Creek, 3 June 1984, W.D. Shepard, 1 ♂ (BPS) .

Epiproct. Length from base to tip, ca. 235-244 μm. Greatest width, ca. 90-109 μm. Greatest thickness, ca. 100 μm. Apical cap diameter, ca. 50 μm. Epiproct cowl without enlarged lobes but cowl extending almost to midlength; epiproct slightly widened from base to subapex, and slightly narrowed to bare apical cap; apex bearing a prominent, bare, sclerotized cap offset from body of epiproct by a groove, and not expanded on venter. Lateral aspect of epiproct inflated to apical third and narrowed beyond to cap. Entire surface of epiproct covered by a dense, closely appressed, setal mat.

Remarks. The Mississippi specimens represent a new state record for this species.