292 TERTIARY INSECTS OF NORTH AMERICA. 



Length of body, 4.2'" ; tegmina, 3.8 mm ; breadth of same, l mm ; length 

 of fore femora, l mm ; fore tibiiv, l"" n ; fore tarsi, 0.(J mm . 



Florissant. Three specimens, Nos. 2706, 5394, 7326. 



6. DlAPLEGMA RUINOSUM. 



A single specimen and its reverse preserved on a side view represent 

 this smallest species of Diaplegma. A portion of the neuration is obscure, 

 but it is otherwise in good condition. The vertex projects but very slightly 

 beyond the eyes. The tegmina are four times as long as broad, the veins 

 heavily haired, the hairs generally set nearer together than their length. 

 The forks of the radial branches are exceptionally short and broad, and the 

 cross-veins uniting the ulnar branches unusually far out, almost farther out 

 than the basal fork of the upper radial branch ; radial lirst forking at about 

 the middle of the wing. Hind tibia? and the basal two joints of hind tarsi 

 armed beneath with a pair of stout, not very long, black-tipped spines; first 

 Joint of tarsi equaling the next two, the middle one very brief. 



Length of body, 3.75 ram ; tegmina, 4.3"""; width of same, 1.05""": 

 length of fore femora, 1.2"""; tibia?, 0.8 nnn ; tarsi, 0.45 mm ; hind femora, 

 l.l mni ; tibia?, 1.5 mm ; tarsi, 0.9""". 



Florissant. One specimen, Nos. 611 and 4558. 



7 DIAPLEGMA OBDORMITUM. 



The specimen representing this species is not so well and continuously 

 preserved as the others of the genus, but differs from them in one or two 

 important points. The tegmina are slightly more than three times longer 

 than broad; the most peculiar feature is the late division of the radial vein, 

 which is only at a distance from the tip equal to the breadth of the wing, 

 and almost exactly opposite the normal division of the lower ulnar branch 

 or opposite the tip of the anal vein, while the arrangement of the subordi- 

 nate reticulation and furcation of the ulnar area is almost the same as that 

 of D. occultorum. The broken state of both wings does not certainly show 

 how the radial vein is divided, which it would be interesting to know on 

 account of its early character; but it would appear as if tho tip of the 

 uppermost ulnar fork curved upward, which with the late furcation of tin- 

 radial and the absence of any branching in the area preserved would indi- 

 cate that its ultimate branches must be many fewer than in the other species. 



Length of body, I" 1 " 1 ; tegmina, 4"""; breadth of same, 1.25""". 



Green River, Wyoming. One specimen, No. 127, Dr. A. S. Packard. 



