Alloperla hamata Surdick 1981

Alloperla hamata Surdick Alloperla hamata Surdick (1981).
Type locality. — Alabama.
Regional distribution. — AR: Johnson Co., Washita Cr., Hwy 103 S. Oark, 19-IV-85, reared 1M, IF, field 17M, IF, 4 n, 4 ex, BCP; Montgomery Co., L. Missouri R., 20-IV-80, 1M, E.J Bacon, J.W. Feminella. MO: Christian Co., Bull Cr., 10-V-72, 29M, B.K. Newman.
The first nymphal description is provided here:
NYMPH: (Fig. 208). General color pale yellow to light brown. Contrasting colors generally lacking, except on head. Labrum, posterior margin of head, and area encircling eyes darker than ocellar triangle. Posterior comers of head slightly angulate, eyes set slightly anteriorly (Fig. 208). Pronotum oval, slightly wider than long. Pronotal setae longest at corners. Femora and tibia with numerous long setae subequal to femur width along outer edge.
Disussion. — Males of this species have a wide, flattened epiproct with lateral serrations (Fig. 186). Nymphs are distinguished from other regional A lloperla by the slightly angulate posterior corners of the head
in Alabama, and the epiproct exhibits geographical variation (Stark et al. 1983). The cool, rock-rubble streams it inhabits may represent glacial relict habitats. Nymphs collected from Washita Creek were found in patches of fine gravel in slower currents behind large boulders. Emergence occurs in April and May.