96 THOMAS SAY FOUNDATION 



Perla capitata Pictet. 



(Plate 13, fig. 8; plate 19, fi^s. 1, 2, 3, and text fig. 4.) 



1842. Perla capitata Pictet, Ins. Neurop., p. 214. 



1852. Perla capitata Walker, Cat. Neurop. B. M., p. 150. 



1861. Perla capitata Eagen, Syn. Neurop. N. A., p. 22. 



L902. Perla capitata Banks, Can. Ent., 34:123. 



1907. Perla capitata Banks, Cat. Neurop., p. 11. 



1923. Phasganophora capitata Klap., Coll. Selys, IV. 2:92. 



1S61. Pcrhi tristis Eagen, Syn. Neurop. N. A., p. 22. 



1904. Perla tristis Banks, Proe. Ent. Soe. Wash., 6:205. 



1907. Perla tristis Banks, Cat. Neurop., p. 12. 



1861. Perla annulipes Hagen, Syn. Neurop. N. A., p. 22. 

 1904. Perla annulipes Banks, Proe. Ent. Soc. Wash., 6:205. 

 1907. Perla annulipes Banks, Cat. Neurop., p. 11. 



1923. Perla annulipes Klap., Coll. Selys, IV. 2:95. 



1862. Perla fiavescens Walsh, Proe. Acad. Nat. Sci. Phil., p. 363. 

 1S76. Perla fiavescens Prov. Le Nat. Can., p. 73. 



1907. Perla fiavescens Banks, Cat. Neurop., p. 11. 



1923. Perla fiavescens Klap., Coll. Selys, IV, 2:93. 



1883. Perla hieroglyphica Provancher, Pet. Faun. Can. Neurop., p. 73. 



1907. Acroncuria hieroglyphica Banks, Cat. Neurop., p. 11. 



1883. Perla marginipes Provancher, Pet. Faun. Can. Neurop., p. 73. 



1900. Perla americana Banks, Trans. Amer. Ent. Soc., 26:243. 



1904. Perla americana Banks, Proe. Ent. Soc. Wash., 6:205. 



1907. Perla americana Banks, Cat. Neurop., p. 11. 



1908. Perla illustris Banks, Trans. Am. Ent. Soc, 34:256. 



1918. Perla innota Banks, Bull. Mus. Comp. Zool. Cambridge, 62:6. 



Length to wing tips, male, 16-18 mm. ; female, 20-24 

 mm. Expanse of wings, male, 26-30 mm. ; female, 35-40 

 mm. 



Color brown with yellowish abdomen. Head with a 

 black spot on the ocellar triangle extending outward be- 

 fore the frontal tubercle toward the base of the antennae. 

 Ocellar triangle longer than wide, the rear ocelli and the 

 eyes about equidistant from each other. Antennae black- 

 ish brown, yellowish along the base of the flagellum. Palpi 

 dark brown. 



Prothorax brown, concolorous. Sides straight slightly 

 convergent rearward, front margin convex, the frontal 

 angles sharp. Hind angles are broadly rounded. Rugosi- 

 ties of the disc are coarse and densely crowded. Legs 

 brownish above and yellowish beneath, tarsi blackish. 

 Wings subhyaline, yellowish along the costal border, the 

 ends brown. 



Abdomen yellowish varied with brown, darker at the 

 tip, the last segment yellow. Tails brown. 



Male. Abdominal segments normal to the 5th which is 

 greatly modified on the dorsal side, the apical margin 

 notched at the sides and prolonged in the middle in a 

 backward directed triangular prominence that is deeply 

 notched in the middle of its rounded apex. This prolonga- 



