1921] NATURAL SCIENCES OF PHILADELPHIA. 249 



rather broadly truncate apical portion, the surface of which is 

 weakly concave. Subgenital plate broad, the meso-distal portion 

 (approximately one-sixth of the entire surface) moderately pro- 

 duced, occupied by two rounded-triangular plates, forming nearly 

 vertical valves and separated proximad from the basal portion of 

 the plate by a strongly concave margin. 



Coloration of sexes similar. Head bright ochraceous-tawny, be- 

 coming ochraceous-orange on occiput, which portion is marked 

 with suffused vertical stripes of rich chestnut brown. Proximal 

 antennal joints, mouthparts and all but distal joint of maxillary 

 palpi ochraceous-buff, last joint of maxillary palpi cinnamon-brown. 

 Antennae in remaining portions mummy brown, near distal ex- 

 tremity with an annulus of light buff (occupying usually three, 

 rarely as many as five, joints). Pronotum shining russet. Teg- 

 mina translucent, shining mars brown, paling slightly laterad and 

 distad to russet ; portion of dextral tegmen, concealed when at rest, 

 transparent, weakly tinged with tawny. Wings delicate, trans- 

 parent, very faintly tinged Avith ochraceous-buff, this more decided 

 in area of costal veins and in radiate field toward its juncture with 

 the appendicular field. Dorsal surface of mesonotum, metanotum 

 and abdomen light ochraceous-buff, the latter in all but proximal 

 portion with a broad marginal suffusion of prouts brown, which 

 broadens distad to include the supra-anal plate and preceding ter- 

 gites. Cerci cinnamon brown. Ventral surface ochraceous-tawny, 

 often pale and tinged with orange, suffused laterad with prouts 

 brown, this not as broad as dorsad. Limbs ochraceous-buff tinged 

 with tawny. 



In the immature condition the shining dorsal surface is tawny or 

 russet, deepening to mars brown laterad. The striking antennal 

 and other markings are as in the adults. 



Measurements {in millimeters). 



Length of Length of Width of Length of Width of 

 cf body pronotum pronotum tegmen tegmen 



Type . 10 2.8 3.6 10.6 3.5 



Paratypes (5) 9.8-10.8 2.8-2.8 3.4-3.6 10.8-11.1 3.4-3.8 



9 

 Allotype 9.2 3 3.8 9.2 3 



Paratypes (3) 9.2-9.4 2.9-3 3.7-3.8 8.6-8.8 3-3 



In addition to the type and allotype, a series of five males, three 

 females, three immature males, five immature females and three 

 very small immature specimens are before us, bearing the same 

 data. Of these the adults are designed paratypes. Five different 

 instars of immaturity are apparently represented. 



In the paratypes with wings spread, the following measurements 

 are shown : length of wing cf 11.7, 9 9; width of wing cf 8.2, 9 6.8; 



