Eurekapnia Stark & Broome, New genus

Type species: Capnia maculata Jewett, 1954 = Eurekapnia maculata (Jewett) by monotypy.

Male characteristics: 1. The male epiproct is almost uniformly slender from base to apex except for an apical area capable of being folded laterally to increase the apical width (Figs. 37, 40-42). 2. The ventral and lateral margins of the finger-like epiproct are formed by a pair of thick sclerites that are separated along the dorsum by a wide groove (Figs. 37-40); width of the groove varies based on position of the sclerites (compare Figs. 51-52). 3. Abdominal tergum 9 bears a pair of conical knobs separated by a gap slightly wider than the folded epiproct tip (Figs. 37-38, 40, 43, 45). 4. The ventral vesicle is almost circular in outline and is attached to the intersegmental membrane between sterna 8 and 9 (Figs. 47-48). The vesicle surface is covered with thick setae.

Female characteristics: 1. The subgenital plate is uniformly pigmented and extends across the entire width of sternum 8 between the two pleural membranes (Figs. 35-36). 2. The posterior margin of the plate is rounded and scarcely exceeds the posterior margin of sternum 8.

Wings: 1. The venation of E. maculata, the only known species, is very similar to that of Bolshecapnia and Sasquacapnia, however the wings of Eurekapnia have scattered brown maculations that give them a distinctive appearance.

Larval characteristics: Undescribed.

Currently recognized species: E. maculata

Distribution: Known only from California (DeWalt et al. 2018).

Etymology: The generic name, Eurekapnia, is based on the California state motto, “Eureka”, a Greek word whose literal meaning is defined as “I have found it”. This word was supposedly uttered by Archimedes after he discovered a successful method for estimating the purity of gold.