• ORTHOrTERA— ACRIDII. 223 



Florissant. Two specimens, both apparently females, No. 141 75, ami 

 the one figured, the latter obtained by Mr. Israel C. Russell, of the U. S. 

 Geological Survey, for whom the species is named. 



GOMPHOCERUS Thunberg. 



Heer describes a species of this genus from Oeningen. It is of small 

 size, like most of those of temperate America and Europe, while the species 

 here provisionally referred to it is very much larger. I have also seen a 

 species from Aix, labeled as a Gomphocerus by Heer, which may, perhaps, 

 be more nearly allied to Leptysma or Arnilia. Gomphocerus and its nearer 

 allies are rather characteristic of, or at least are at present better known 

 from, temperate regions, and are found around the entire globe. (July, 

 1884.) 



Gomphocerus abstrusus. 



PI. 17, Fig. G. 



This species is placed here because of its general affinities as indicated 

 by the front half of the body, which, as seen on a side view, is all that is 

 preserved. It does not seem, on several accounts, to belong in the genus, 

 but it plainly comes near it. The head is large and protuberant, with a 

 prominent vertex, sharply angled as seen on a side view, with a rounded, 

 retreating face. Antenuiie slender, very slightly enlarged to a fixint elon- 

 gated club at the apex, nearly reaching to the tip of the pronotum. The 

 latter short, with quadrate deflected lobes, the inferior margin straight. 

 Tegmina lai'ge, dusky, with the interspaces between the longitudinal veins 

 broken at base by straight cross-veins into pretty regular squai'e or sub- 

 quadrate cells. 



Length of fragment, 21"'°; of head, 4.5"""; length of face, 5.5""; 

 length of antennae, 8°""; of pronotum, 5'"™; height of same, 4°"". 



Florissant. One specimen, Nos. 635 and 11736. 



Subfamily CEDIPODID^^ Stai. 



To this subfamily belong most of the fossil Acridii and half of the 

 American species. Heer in his Tertiiirgebilde and his [Jrwelt der Schweiz 

 describes half a dozen species from Oeningen and Radoboj, referring them 

 all to the old genus ffidipoda. Serres mentions a species from Aix which 



