Mayfly Species Rhithrogena gaspeensis

A species of the Rhithrogena brunnea (now a synonym of Rhithrogena hageni) group, having lateral spines on the penes.

Head deep brown, with blackish shading around bases of ocelli. Thorax deep pitch-brown; pleura paler brown, anterior to wing roots. Legs dull brown; a central longitudinal blackish streak on femora. Wings hyaline; veins fine, brown; extreme base of wing with a very faint brownish tinge. Abdominal segments dull brown; basal segments slightly paler hyaline...near intersegmental areas” (McD)., but with no definite markings. Tails deep smoky.

Allied to Rhithrogena doddsi (now a synonym of R. hageni) and Rhithrogena morrisoni, in type of male genitalia; differs from the former "in that the penis-lobes are much more narrowed apically and bend gently and evenly outward; there is further no trace of any other spining on either dorsal or ventral surfaces; in morrisoni the lobes are broader apically and more excurved and there is a very distinct, although small, spine on the inner ventral surface of each lobe” (McD). (See fig. 100, after McDunnough).