HEMIPTERA— HOMOPTERA— JASSIDES. 307 



The costal margin of the tegmina is greatly thickened and regularly and 

 considerably arcuate, giving an unusually ovate shape to the whole, which 

 is increased by the somewhat pointed though rounded apex. The tegmina, 

 which are less than three times as long as b'road, appear to be tenuous, and 

 the veins, though not the sutura clavi, are very indistinct. The body is 

 uniformly dark and parallel-sided. 



Breadth of body. 2.5"°'; length of tegmina, 5.75"""; breadth, 2""; 

 length of hind tibiae, 3.25""". 



Florissant, Colorado. One specimen. No. 78. 



4. Agallia abstructa. 

 PI. 19, Fig. 5. 



Head as broad as the uniformly broad thorax. Tegmina barely extend- 

 ing to the tip of the abdomen, long oval, almost three and a half times as 

 long as broad, the costal border regularly and very little arcuate, the apex 

 strongly convex ; the ulnar vein forks at the end of the proximal third of 

 the wing, and the upper brancli is immediately united by a recurrent cross- 

 vein, longer than the pedicel of the upper ulnar, to the radial vein, the latter 

 running into the margin not far before the tip but uniting with it by no 

 cross-vein ; scarcely beyond the middle of the wing the radial and upper 

 ulnar veins are united by a bent cross-vein, from the middle of which springs 

 a veinlet, dividing the area between them, and at just about half-way to the 

 tip all the veins are united by a transverse series of gradate cross-veins, 

 beyond which the discontinuous longitudinal veins diverge, producing apical 

 cells distinctly broader at the margin than at base 



Length of body, iS""""; tegmina, 3.7"""; breadth of bodj^, 1.5"""; teg- 

 mina, l.!"". 



Florissant. One specimen. No. 2658. 



GYPONA Germar. 



The only reference of a fossil to this genus is in my first mention of 

 the Homoptera collected by Denton on the White River, as belonging to 

 genera "allied to Issus, Gypona, and Delphax." Since then these have been 

 described under the genera Aphana, Delphax, Tettigonia, and Bythoscopus. 

 The one now described below is referred here only in a general and vague 

 sense, as it is too ill preserved to speak of it with confidence. 



