Allocapnia sandersoni Ricker (Figs. 103-108) Allocapnia sandersoni Ricker 1952:165. Holotype ♂ (Illinois Natural History Survey), Clear Creek, 2.5 miles N Fayetteville, Washington Co., Arkansas Allocapnia sandersoni: Ross & Ricker, 1971:40. Material examined. Arkansas: Searcy Co., Little Red River, Hwy 65, 4 January 1997, B. Stark, S. Tucker, 1♂, 2♀ (BPS). Male epiproct. Apical segment of upper limb ca. 286 μm long and armed on the apical ca. 202 μm with dense patch of wave-like spikes (Figs. 103-106); apical segment ca. 142 μm wide at base and slightly swollen to ca. 164 μm near base of armature; armed area gradually narrowed to a rounded tip. Basal segment of upper limb ca. 572 μm long and ca. 111 μm wide near midlength; basal segment bears a shallow, longitudinal groove extending to near base of apical segment. Greatest width of lower limb ca. 198 μm; marginal area near spoon lined with sparse row of long setae. Male tergal process. Prominent raised, narrowly divided process on abdominal tergum 8 (Figs. 106- 108). Process on tergum 8 ca. 214 μm wide and covered with scale-like structures; median notch of process ca. 36 μm wide.

{"references": ["Ricker, W. E. 1952. Systematic studies in Plecoptera. Indiana University Publications, Science Series No. 18. Indiana University Press, Bloomington, Indiana. 200 pp.", "Ross, H. H. & W. E. Ricker. 1971. The classification, evolution, and dispersal of the winter stonefly genus Allocapnia. Illinois Biological Monographs 45: University of Illinois Press, Urbana, Illinois. 166 pp."]}

Published as part of Stark, Bill P. & Kondratieff, Boris C., 2012, Epiproct And Dorsal Process Structure In The Allocapnia Forbesi Frison, A. Pygmaea (Burmeister), And A. Rickeri Frison Species Groups (Plecoptera: Capniidae), And Inclusion Of A. Minima (Newport) In A New Species Group, pp. 45-77 in Illiesia 8 (5) on page 72, DOI: 10.5281/zenodo.4760725