290 TERTIARY INSECTS OF NORTH AMERICA. 



In memory of the pioneer American naturalist and philologist, the late 

 Samuel Stehman Haldeman, Esq. 



Florissant, One specimen, No. 2237. 



2. DlAPLEGMA VETERASCENS. 



There is but a single specimen of this species, but in it one of the teg- 

 mina is admirably preserved. These are a little more than three times as 

 long as broad, broadest in the middle of the apical half, before which they 

 narrow very regularly and very gently, and beyond which the apex is 

 rather sharply rounded. The radial vein first forks at just about the middle 

 of the wing, the lower ulnar at some distance beyond it ; there are three 

 clustered forks to the upper radial, two to the lower, and the cells formed 

 by them are rather slender though short. The upper ulnar branch and its 

 upper fork are distinctly bent where they join, and the lower fork crosses to 

 the center of the lower ulnar fork and there divides in two, without con- 

 tinuing to the lowermost ulnar nervule. 



Length of body, 4.f>'" m ; tegmina, 4.2 mm ; width of same, 1.3 mm . 



Florissant. One specimen, No. 10680. 



3. DlAPLEGMA ABDUCTUM. 

 PI. 15, Fig. 8. 



The tegmina of this species are less than three and a half times longer 

 than broad, very uniformly rounded at the apex, the costal and inner bor- 

 ders almost exactly parallel in the outer half before the tip and straight. 

 The radial vein first forks at just about the middle of the wing, the lower 

 ulnar scarcely before the end of the middle third ; there are three clustered 

 forks to the upper radial, the last one very strongly arcuate at base, but 

 not connected by a cross-vein to the lower radial, which has t\vo forks, and 

 all their cells are short but slender. The relation of the ulnar branches to 

 each other is peculiar: the upper ulnar branch is simply, symmetrically, 

 and narrowly forked as far be} r ond the end of the middle third of the wing 

 as the lower ulnar before it ; the adjacent forks of the two branches ;i re 

 IKMV united by a cross-vein immediately beyond the furcation of the upper 

 ulnar, the two forks are angulated at the point of touch, and this cross-vein, 

 slightly shifted outward, runs as a longitudinal vein through the middle of 



