262 TEKTIAKY INSECTS OF NORTH AMERICA. 



backward and outward. Middle leg moderately stout ; femur and tibia of 

 equal width, straight, apparently with sharp edges. Abdomen full, rounded, 

 broad, the extremity broadly rounded ; it is dusky, especially beyond the 

 base, the neighborhood of the spiracles darker, the fifth to the seventh seg- 

 ments with a medio-dorsal (or medio- ventral?) raised line marked in black. 



Length of body, 9.5"""; breadth of head, 1.8"™; of abdomen, 5°""; 

 length of tegmina, 10'"""; width of same, 3.5°""; length of femora (some- 

 what doubtful), 2"™. 



Chagrin Valley, White River, Colorado. One specimen, W. Denton. 



ApHANA ROTUNDIPENNIS. 



PI. 6, Fig. 27. 



Aphana rotnndipenms Scndd., Bull. U. S. Geol. Geogr. Siirv. Terr., IV, 772 (1878). 



This name is proposed for a couple of wings which seem by their 

 obscure venation to belong in the same group as the last. They differ, how- 

 ever, in having a strongly bowed costa, which is curved more apically than 

 near the base, and continues very regularly the curve of the well-rounded 

 apex ; the commissural border is perfectly straight ; the principal veins fork 

 near the base, so that there are a number of longitudinal veins a short dis- 

 tance therefrom ; no transverse veins are discernible, nor oblique veins at 

 the costal margin, but the longitudinal veins all fork at a similar distance 

 from, the apex, so that the apical fifth of the wing is filled with still more 

 numerous longitudinal veins; the tegmina are broadest just beyond the 

 middle. 



Length of tegmina, 6.75""" ; breadth of same, 3"™. 



Green River, Wyoming. Two specimens, Nos. 175 (F. C. A. Rich- 

 ardson), 4187 (S. H. Scudder). 



LYSTRA Fabricius. 



The specimens that are placed here are very obscure and imperfect, 

 and when better ones are obtained the species will very probaljly have to 

 be removed elsewhere, and perhaps even to another subfamily ; but what 

 can be made out reminds one •f this group as well as of any other, and 

 they are therefore placed here provisionally, though it is plain that they do 

 not belong together. No fossil species besides these have been recorded. 



Table of the sjpecies of Lystra. 



Lateral sulci of mesonotum parallel ...I. L. ricliardsoni. 



Lateral sulci of mesonotum posteriorly convergent U. i. leei. 



