Mayfly Species Cinygmula gartrelli

Male. Eyes (dried) deep black-brown, not contiguous. Head with anterior portion sepia-brown with paler antennal pits and some black shading on each side of the vertical keel; vertex of head behind the ocelli deep blackish. Thorax dorsally sepia-brown, shading into black-brown on mesonotum posteriorly and with lighter shades on anterior projection of mesonotum and faintly cephalad of scutellum; pleura brown, with the membranous portions paler, a wine-colored patch anterior to base of forewing from which a pale ochreous dash projects towards the pronotum; there are also faint ruddy tinges at bases of legs; sternum brown, shaded with black brown. Abdomen dorsally with segment I deep brown, segments II-VII with anterior half pale, semi-hyaline ochreous-brown, the posterior portion deeper brown with a slight ruddy tinge, giving a distinct banded appearance; segments VIII-X opaque, more evenly dark brown with the paler areas showing as small lateral patches on VIII and IX. Ventrally light ochre-brown, faintly tinged with ruddy along posterior margins and at times on three posterior segments; ganglionic marks very faintly visible. Forceps and setae deep smoky. Forelegs deep smoky-brown, tibia slightly longer than combined trochanter and femur; mid and hind legs paler brown with slight ruddy tinge on the femora. Wings very characteristically marked, hyaline with a brownish-amber tinge at base, extending more faintly along costal region of both wings; veins fine, brown; crossveins strong, brown, lightly bordered in the costal half of forewing with brown shading which gives them a decidedly thickened appearance in this region.

Slightly paler than male. Head light brown, shaded with ruddier brown next the eyes. Pleura and abdomen with more extended ruddy brown suffusion than in the male. Forelegs paler.