LUCY WRIGHT SMITH 
447 
Adult 
(f '. — Length to tip of wings, 40 to 47 mm.; length of antennae, 22 to 25 mm.; 
length of setae, 10 to 13 mm.; expanse of wings, 70 to 80 mm. 
9 . — Length to tip of wings, 50 to 60 mm.; length of antennae, 22 to 26 mm.; 
length of setae, 12 to 15 mm.; expanse of wings, 86 to 106 mm. 
The largest species in the genus; body dark fuscous, varied with paler mark- 
ings. Head as broad as prothorax; labrum pale; a round, glossy spot either 
side of the ocellar triangle; supra -antennal plate widest in middle, forming a 
rounded angle. 
Prothorax slightly widened posteriorly; front margin and sides, straight; 
posterior border convex; angles sharply produced; a median yellow line broader 
at the ends, interrupted in the middle by darker markings extending across the 
disc. Trochanters yellowish, knees yellow in some specimens. Wings greyish 
hyaline with blackish veins, somewhat clouded. 
Abdomen pale jTeilow on the venter, posterior margins of the tergites paler. 
Male. The ninth ventral segment, elongated toward the setae, with a 
terminal notch broadly open, the sides of the notch straight. The tenth seg- 
ment covered below by the ninth; bifid above, its two lobes elongate and 
appendage-like, the opposed edges emarginate in the apical half, the tips 
rounded and strongly bent upwards. The sub-anal plates with long, straight, 
finger-like prolongations, parallel with, and extending beyond, the tips of the 
ninth ventral segment. The supra-anal plate modified as a sperm-conveyer; 
above it appears as a narrow trough, between the tips of the prolongations of 
the ninth ventral segment it curves ventralward and ends in an inverted cup 
or bowl-like structure (fig. 1). 
Female. The eighth ventral segment truncate (fig. 2). Two small marginal 
triangular processes have been described in this species,- but as Hagen has 
pointed out* these are mere folds of membrane projecting from the posterior 
margin on the sides of the genital aperture, and .are not always present. 
Numerous specimens from the tributaries of the Ohio Kiver, 
agreeing well with Say’s description of Pt. dorsata and Newman’s 
type specimen of Pt. regalis, have enabled me to reach a decision 
as to the identity of Say’s long-lost species. Described above 
from many specimens, male and female, from Harrisburg, 
Pennsylvania; Elkhart, Indiana; and Ithaca, New York. 
Nymph 
Length of body, 33 mm.; length of antennae, 18 mm.; length of setae, 12 mm. 
Dark brown, paler on the palpi and legs, and a broad median paler area 
along the entire length of the venter. Antennae uniform in color, of about 68 
segments, the supra-antennal plate blunt with rounded corners. 
Prothorax, broader behind, front margin and sides straight, hind margin 
convex, the corners produced laterally and arched upwards (fig. 17). 
* Hagen, Proc. Host. Soc. Nat. Hist,, 15: 287. 
’Stett. Ent. Zeit., 38, 1877: 480. 
TRANS. AM. ENT. SOC., XLIII. 
