60 THOMAS SAY FOUNDATION 



Female. Subgenital plate bilobed with hairy margin, 

 the lobes extend well over the ninth sternite, and the 

 median excavation between them is wide. 



Distribution. — White Mountains, N. H. 



The type is No. 11308, M. C. Z., in the Banks Collection. 



The junior author has studied this type and finds 

 Banks' figure of the subgenital plate seriously in error 

 (1. c, PI. 28, fig. 17), in showing the lobes at its tip slender 

 and incurved; they are broad and rounded, as shown in 

 Miss Smith's plate (1. c, PI. 33, fig. 53), and in our figure. 



Perlodes lineata Smith. 



(Plate 7, fig. 18.) 

 1917. Arcynopteryx lineata Smith, Trans. Amer. Ent. Soc, 43:476. 



Below we transcribe the entirely adequate original de- 

 scription : 



Female. Length to tip of wings, 22 mm.; expanse of 

 wings, 34 mm. ; length of antennae, 9 mm. ; length of 

 setae, 11 mm. 



Color dark brown varied with yellow, pubescent. Head 

 with three small ocelli arranged in an isosceles triangle, 

 the lateral ocelli equidistant from each other and the 

 inner margin of the eyes, the distance between them a 

 third greater than the side of the triangle. On either 

 side of the ocellar triangle, a little closer to the lateral 

 ocellus than to the inner margin of the eyes, is a rather 

 flat, elliptical tubercle. M-shaped mark fairly prominent. 

 Head yellowish-brown, a blackish-brown, rectangular, 

 frontal spot with short horns extending posteriorly to the 

 paired ocelli ; entire occipital border yellow with a broad, 

 median, triangular extension passing forward with its 

 apex in the apex of the ocellar triangle ; anterior to the 

 yellow border, a dark brown coarsely sculptured oval area 

 on the lateral occipital regions. Under side of head yel- 

 lowish, palpi and antennae brown. 



Prothorax quadrangular, wider than the occiput, 

 breadth almost twice as great as the width, front and hind 

 margins a little convex, sides straight, angles rounded; 

 a broad, median, yellow stripe ; inner lateral fields with 

 glossy corrugations. Meso- and metanotum dark brown. 

 Venter of thorax pale with a large, brown, median, shield- 

 shaped spot on each of the three segments, on the an- 

 terior border of the last two segments, transverse bands 

 running out from the median spots. Legs dark brown 

 with femora and upper part of tibiae a little paler in 

 coloration. Wings with yellow-brown venation, an ir- 



