220 TERTIARY INSECTS OF NORTH AMERICA. 



but the specimen would appear to be a male. The legs are moderately 

 stout, the hind femora reaching to about the tip of the fourth abdominal 

 segment. 



Length of body, 20 mm ; of head, 1.5 mm ; of pronotum, 2.75 mm ; of meso- 

 notum, 3 U " U ; of metanotum, 2.6 mm ; breadth of head, 1.25 mm ; of pronotum, 

 1.75"""; of mesonotum, 3"' m ; length of fore and middle femora, 3.25"""; of 

 hind femora, 4.75 mm ; of hind tibia?, 5 mm . 



Florissant. One specimen, No. 5817. 



Family ACRIDII Serville. 



Only ten Acridii have been published as found in the European Ter- 

 tiaries and most of these belong to the (Edipodidae or have been placed 

 there. The exceptions are CEdipoda nigrofasciolata Heer, Gomphocerus 

 femoralis Heer and Acridium barthelemyi Hope which are probably Trux- 

 alid;e, and Tetrix gracilis Heer which is certainly a Tettigidea, The six 

 species we have found in America are all Truxalida- and fEdipodid;v, so 

 that, all but one of the known species belong to these two groups, the Guli- 

 podidre having half as many again as the Truxalida 1 in general, though 

 the two groups are equally represented in America. It is not a little 

 remarkable that no Acridida? proper have been found fossil. This group 

 has a vast development in the United States, and together with Phyma- 

 ticlte and Pamphagida^, likewise totally unrepresented, is even richer in trop- 

 ical regions. The subfamily best represented may be considered more than 

 any other a denizen of the temperate regions. (July, 1884.) 



Subfamily TRITXALIDyE Stal. 



Nearly a third of the known fossil Acridii belong to this group, and, as 

 stated above, it contains one-half of the American species. The reference 

 of Acridium barthelemyi Hope from Aix to this group is, however, somewhat 

 doubtful, the species being imperfectly described. CEdipoda nigrofasciolata 

 Heer from Radoboj seems to belong here rather than to the CEdipodidse, 

 for the vena intercalata is wholly absent and its close resemblance to the 

 large subtropical genus Scyllina Stal renders it probable that it belongs to 

 that group ; a new resemblance is thereby discovered between the Radoboj 

 fossils and types of the wanner parts of America. (July, 188-4.) 



