Stonefly Species Perlesta baumanni (Golden Stones)

Source: Additional Characters In Perlesta Baumanni Stark (Plecoptera: Perlidae), With Notes On Other Ouachita Mountain Species

Adult habitus. Color pattern. - The head is darkly pigmented, particularly on the area forward of the epicranial suture (Fig. 1); the black suture line extends laterally beyond the ocelli about midway to the eye. Dark pigment extends laterally in front of the eye to the margins of the head, but an obscure pale spot interrupts the dark pigment anterolaterad to the ocelli. Forward of the M- line a dark median area is surrounded by pale pigment. The pronotum is dark brown with darker rugosities and black sutures. Abdominal terga 6 - 10 are dark, with tergum 10 very dark over most of the surface (Fig. 2); abdominal sterna 8 - 10 are dark brown to black. Apical cercal segments are black, but several segments at mid-length are banded with dark apices and pale basal bands. Male aedeagus. Aedeagal tube + sac long and slender, caecum very small (Figs. 3 - 4). Dorsal patch broad basally, covering entire surface, but patch narrows gradually to a point on the caecum from near mid-length. Lateral sclerites slender and projecting forward beyond base of dorsal patch.