288 TERTIARY INSECTS OF NORTH AMERICA. 



OliarusI lutensis. 

 PI. 7, Fig. 18. 



The species placed here provisionally can certainly not belong here, as 

 the scutellum is only tricarinate, and the veins of tlie tegmina are smooth 

 and continuous. Evidently, however, it comes near it, to judge from the 

 course of the venation. Tlie head, of which only the part lying between the 

 eyes is preserved, is very small and narrow, little prominent ; the thorax, 

 not properly shown in the plate, transverse, equal, short, angularly bent, so 

 that the base of the scutellum being almost as strongly angulate as its tip, 

 the scutellum is diamond-shaped ; it has three very delicate carinpe, the 

 lateral ones divergent. The tegmina are three times as long as broad, con- 

 siderably surpassing the abdomen, diaphanous, with a dusky roundish spot 

 just below the costal edge in the middle of the apical two-thirds ; just before 

 it the main longitudinal veins first fork and are united by cross-veins in a 

 zigzag manner, and they again fork and are to some extent again united 

 half way from here to the tip. 



Length of body, fi°"" ; breadth of scutellum, 1.75"™ ; length of tegmina, 

 7.25°"". 



Green River, Wyoming. One specimen, No. 112, Dr. A. S. Packard. 



Possibly in tiiis vicinity should be placed the wings figured, PI. 7, Fig. 

 10, which from their oljscurity and because of their being longitudinally 

 folded I am unable to place definitely. 



DIAPLEGMA gen. nov. {'haTrXey fxa). 



This name is given to an extinct group of Cixiida allied to Cixius and 

 Oliarus with peculiar neuration. The insects are small and slender bodied, 

 with protuberant, pointed head, antennte apparently much as in Liburnia, 

 a genus of Delphacida, long and slender legs, and elongate wings largest 

 in the middle of the apical half or even third, with strongly and regularly 

 rounded apex. The sutura clavi is very long, and the anal veins unite in 

 one far before their tip ; the radial vein forks near the middle of the wing, 

 and each of the forks sends at its tip a cluster of two or three curved inde- 

 pendent branches to the costal margin far out ; the two ulnar branches, 

 which separate close to the base of the wing, usually fork farther out than 

 the radial, the upper branch of the fork of the upper ulnar vein just striking 



