II E M 1 PTER A— HOMOPTE R A— FULGORIN A. 2 89 



the apex of the wing, tlie lower branch crossing the upper branch of the 

 fork of the lower ulnar vein and reforking between the forks of the latter in 

 a somewhat peculiar manner, sometimes connected by cross-veins to the 

 lower branch of the lower ulnar fork ; the lower ulnar branch forks a little 

 earlier than the upper and directly opposite the end of the united anal 

 veins. Venation of hind wings so far as seen a good deal as in Cixius, but 

 the forking of the upper veins beyond the cross-veins is so deep as to run 

 fairly up to these cross-veins. 



Seven species are recognized in our Tertiary deposits. 



T<Me of the species of Diaplcgma. 



The two main braucbes of the ulnar vein fjrking distinctly farther out than the first radial furcation. 



Apical, radial, and ulnar veinlots reaching the margin twelve in numljer 1. D. haldemani. 



Apical, radial, and ulnar veinlots reiiebinjj the margin not over ten in number. 

 Upper ulnar branch distinctly disturbed in course at its first furcation. 



Upper fork of lower ulnar vein passing in a continuous and regular curve across the upper 



ulnar branches to the margin '■i- D. veterascens. 



Upper fork of lower ulnar vein interrupted in its regul.ar course when it meets the upper 



ulnar branches 3. D. ahditctiim. 



Upper ulnar branch with its upper fork making a continuous or almost continuous line, unde- 

 viating in course. 



Tegmina nearly three times as long as broad 4. D. venerabile. 



Tegmina nearly or quite four times .as long as broad. 



Cross- veins uniting the ulnar branches considerably farther from the apes of the wing 



than the breadth of the wing where they occur 5. D. occullorum. 



Cross-veins uniting the nlnar branches only as far from the apex of the wing as the 



width of the wing where they occur 6. J), ruinosiim. 



The lower ulnar vein forking almost exactly opposite the furcation of the radial 7. D. obdormitiim. 



1. DiAPLEGMA HALDEMANI. 



The antennae are about as long as the tricarinate scutellum. The teg- 

 mina are about three and a half times longer than broad, with very straight 

 costa, largest in the middle of the apical third, scarcely narrowing baseward 

 The radial vein forks exactly at the middle of the wing, the lower ulnar 

 branch at some distance beyond ; the upper radial branch is two, the lower 

 three forked, since the first of its forks again subdivides. Opposite the 

 furcation of the upper radial l)ranch the upper ulnar branch forks widely, 

 its upper brancli, an unusual circumstance and perhaps individual, forking 

 narrowly, its lower crossing to the center of the lower ulnar fork, where it 

 divides in two, the upper l)ranch again forking, but there is no connection 

 with the lowermost ulnar nervule. 



Length of body, 4""°; of tegmina, 4.15""°; width of same, 1.15""°; 

 length of fore tibise, 1"™ ; tarsi, 0.45°"°. 



VOL XIII 19 



