HEMIPTER A— HOMOPTERA— CERC OPID^, 3 1 7 



retreats slightly at the sides, so as to give it a slightly convex aspect. The 

 body is dark and uniform, the tegmina the same but sliglitly lighter over 

 the disk ; the costa is very strongly convex. 



Length of body, 2.75°""; breadth, 1.1°"° ; length of tegmina as jjre- 

 served, 3.5°'°' ; as restored, 3.8°"°. 



Green River, Wyoming. One specimen, No. 108, Dr. A. S. Packard. 



2. Cercopites calliscens. 

 PI. 6, Fig. 32. 



Head suborbicular, with scarcely protruding eyes, a little broader only 

 than long ; the ocelli are obscure, but what are apparently these are farther 

 removed from each other than from the eyes. Thorax broadest in the 

 middle of the anterior half, from which point it rapidly narrows both in 

 front and behind ; base straight ; front margin broadly concave except for 

 a slight and angular middle prominence, which breaks the curve in two. 

 Body dai'k fuliginous. Tegmina pallid, but with a darker costal margin 

 and a similar but broad apical band ; the veins show with tolerable di.s- 

 tinctness, though they are generally very obscure in the wings, which show 

 a neuration in all respects typical so far as visible. 



Length of body, including closed wings, 11°™; breadth, S.S"" ; length 

 of tegmina, 8.5°'°'. 



Green River, Wyoming. One specimen, Nos. 104 and 115, Dr. A. S. 



Packard. 



CERCOPIS Fabricius. 



A number of species have been referred to this genus from the Euro- 

 pean Tertiaries, but, as mentioned below under that subfamily, they are 

 mostly referable to the Aphrophorida. It is doubtful whether any of the 

 species of true Cercopina should be classed generically with those here 

 placed in this group, and which are known by their tegmina only ; the 

 form of the wings, as well as their neuration, differs considerably, but until 

 more of the structure can be determined it has seemed best to class them 

 here. It mav be noted that the radial vein branches sooner than in Cer- 

 copites. 



Tahle of the species of Cercopis. 

 Tegmiua unicolorous. 



Larger species ; tbe tegmina measuring fifteen millimeters in length; radial vein before forking 



widely distant from margin. 1. C. seJirjini. 



Smaller species ; the tegmina measuring less than ten millimeters in length; radial vein betbrc 



forking only moderately distant from the margin 2. C. astricta. 



Tegmina transversely bauded 3. C. sufocata. 



