248 TERTIARY INSECTS OF NORTH AMERICA. 



is much more open, but how much the condition of the specimen does not 

 show. Cubital vein arising scarcely farther from the second oblique vein 

 than the latter is from the first, forking much as in the preceding species, 

 but passing in a gently arcuate course midway in the space allotted to it. 

 The stigmatic vein parts gently with a considerable arcuation, but not very 

 widely, from the stigma, the cell being apparently about one-third the length 

 of the wing. 



Length of body, 3.5 mm ; fore wing, 4.75 mm ; hind femora, 2.4 mm ; hind 

 tibia and tarsi, 4.6 mm . 



In memory of Benjamin Franklin Mudge, the Kansas geologist and 

 paleontologist. 



Florissant. One specimen, No. 13328. 



3. GEEANCHON gen. nov. (yepaiof, dynobv). 



Wings only known. Fore wing with the stigmatic vein arising from 

 the middle of the stigma. Cubital vein twice forked, the first time very far 

 from its origin, which is near the middle of the proximal half of the space 

 between the base of the first oblique and the stigmatic veins, the second 

 time scarcely behind the base of the stigmatic vein. Second oblique vein 

 arising many times nearer the first oblique than the cubital vein and close 

 to the former, the first discoidal cell between them about ten times broader 

 on the hind margin than at the base. 



Table cf the species of Geranchon. 



Cubital vein runuiug considerably below the middle of its area, its branches straight .. ..1. G. damsii. 

 Cubital vein running through the middle of its area, its branches arcuate 2. G. petrorum. 



1. GERANCHON DAVISII. 



Only the wing is preserved and the base is broken, but it may be judged 

 to have been fully three times as long as broad. The postcostal vein is very 

 broad and straight, merging into the slightly thickened fusiform stigma ; next 

 the base ii is rather far removed from the costal margin. The first oblique 

 vein parts at an angle of about sixty degrees with the postcostal and is 

 straight; the second at an angle of forty-five degrees and is straight nearly 

 to the tip, which is lost but appears to bend outward, so that the first dis- 

 coidal cell between them, very narrow at base and broadening at tip, is ex- 

 cessively different in width at its two extremities. Cubital vein faint at its 



