Allocapnia forbesi Frison, 1929

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, Illiesia 8 (5), pp. 45-77 : 47-50

Allocapnia forbesi Frison

( Figs. 7-12 )

Allocapnia forbesi Frison 1929:397 .

Holotype ♂ (Illinois Natural History Survey), tributary North Hicks Branch , Herod [Pope Co.], Illinois

Allocapnia forbesi cornuta Frison 1935:363 . Holotype ♂ (Illinois Natural History Survey), Hills Branch Creek, Dixon Springs [Pope Co.], Illinois, syn. Illies, 1966:123.

Allocapnia forbesi: Ross & Ricker, 1971:35 .

Material examined. Kentucky: Adair Co., tributary Big Creek, Hwy 268, west of Milltown , 3 March 2001, B.C. Kondratieff, R.F. Kirchner, R. E. Zuellig, 7♂ ( CSUC). Marion Co., Conley Creek, Hwy 49, 3 March 2001, B.C. Kondratieff, R.F. Kirchner, R.E. Zuellig, 2♂ ( CSUC) . Ohio: Hamilton Co., Cincinnati, French Park , 31 January 1953, A. R. Gaufin, 1♂ ( BPS) .

Male epiproct. Apical segment of upper limb ca. 180 μm long, swollen at midlength but not bearing ear- like lobes; median field of apical segment bearing a patch of wave-like spikes ca. 178 μm long and narrowly divided along entire length by groove ( Figs. 7-10 ); greatest width of apical segment ca. 162 μm, narrowed to apical width of ca. 87 μm ( Fig. 9 ). Basal segment of upper limb ca. 437 μm long and ca. 89 μm wide at narrowest point near midlength ( Fig. 8 ). Lateral areas of basal segment appearing bare; median area with longitudinal groove. Lower limb ca. 139 μm wide proximal to apical spoon.

Male tergal process. Prominent raised structures on abdominal terga 7 and 8 ( Figs. 7, 10-12 ). Process of tergum 7 somewhat conical, but broadly rounded on dorsum ( Fig. 11 ); apex without scale-like structures. Process of tergum 8 broadly and deeply notched with lobes resting on a narrow, plateau-like structure ( Figs. 8, 10, 12 ); dorsal outline of lobes subtriangular and covered over most of surface with scale-like structures; basal width of notch ca. 42 μm, dorsal width across lobes ca. 211 μm.

Figures

Figs. 7-12. Allocapnia forbesi, tributary Big Creek, Adair Co., Kentucky. 7. Male terminalia, dorsal. 8. Epiproct and 8th tergal process, dorsal. 9. Apical segment upper limb of epiproct tip, dorsal. 10. Apical segment upper limb of epiproct and 8th tergal process, lateral. 11. Abdominal tergal lobes, lateral. 12. 8th tergal process, anterodorsal.