46 THOMAS SAY FOUNDATION 



Pteronarcella badia Hagen. 



(Plate 7, figs. 14, 16, 17; plate 8, fi^s. 1, 2, 6, 7.) 

 1873. Pteronarcys badia Hagen, Bull. Geol. Surv. Terr., p. 573. 

 1907. Pteronarcella badia Banks, Cat. Neur. Ins. U. 8., p. 10. 

 1917. Pteronarcella badia Smith, Trans. Amer. Ent. Soc, 43:460. 

 1917. Pteronarcella regularis Smith, Trans. Amer. Ent. Soc, 



43:459 {$). 

 1917. Pteronarcella torosa Smith, Trans. Amer. Ent. Soc, 43:461 ($ 



and nymph). 

 1917. Pteronarcella triloba Smith, Trans. Amer. Ent. Soc, 43:462 ($). 



Male. Length to wing tips 15 mm. ; expanse 22-24 mm. ; 

 tails 6 mm. 



Female. Length to wing tips 17-19 mm. ; expanse 30- 

 34 mm. 



Color blackish, varying in depth with age, the black 

 becoming more diffuse in old specimens. Head deep black 

 between the ocelli, the paler area around the compound 

 eyes confluent with the yellow of the frontal tubercles, 

 the latter forming a sharp emargination in the black 

 spot of the crown at each side of it. First joint of an- 

 tennae, and the carinae adjacent to its base, blackish. The 

 mid-dorsal pale line of the prothorax meets a transverse 

 pale dash on the middle of both front and hind margins of 

 the prothorax. In the better colored specimens a large 

 V-mark is laid upon the middle of the segment, its arms 

 opening forward and curving outward, its point resting 

 on the pale mid-dorsal line. There is also a narrow, 

 oblique pale dash in the smooth field of the disk at either 

 side of the point of the V. The rugosities at either side 

 of these pale marks on the disc are generally black, but 

 occasionally they are yellowish or reddish. Pronotum of 

 the mesothorax blackish, with a median dividing pale spot 

 that is dilated at the front. Wings dusky, without pat- 

 tern ; membrane smoky, veins brown. Legs brown to 

 black, darker on the longitudinal carinae. Abdomen and 

 tails brownish, in varying depths of color, darker on the 

 genitalia and along the sides. 



Male. Genital segments very dark brown: paired 

 knobs on abdominal segments 2 to 8, yellow internally, 

 and covered with brown scurfy hairs externally, dis- 

 tinctly elevated only on segments 5 to 8. Tips of the geni- 

 tal hooks slenderer and more sharply pointed than in the 

 preceding species. Also the recurved scoop-like append- 

 age on the dorsum of segment 9, besides being broader 

 and blunter than in P. regularis, seems in this species to 

 run down in continuity of marginal fold with the apical 

 carina of segment nine at its sides, whereas the side of 



