47 



of both. It extends east and west from the Atlantic to the Pacific, but its 

 northern and southern range is not known. T. viridifasciata is common from 

 Maine to Mississippi and from Florida to Nebraska. 



Tomonotus, although given here as a distinct genus, is by no means a 

 well-defined group, some of the species approaching so near some CEdipodce 

 that there are no generic characters by which to separate them. It is repre- 

 sented throughout* the United States and in Mexico. The specimens of 

 T. sulphureus, from the south (Tennessee especially), which I have examined, 

 appear to have tlie crest of the pronotum slightly more elevated than those 

 from more northern and western sections. T. xanthopterus and T. carinatus 

 are probably only varieties of T. sulphureus. 



T. teucbrosus is widely distributed over the west, from the western line 

 of Minnesota south to Indian Territory, west to the Rocky Mountains, along 

 which it ranges from New Mexico to Southern Montana. 



The only species of Stauronotus found in the United States appears to 

 be confined to the higher plains and plateaus of the Rocky Mountain regions. 



Tropidolophus is represented by the single species T. formosus, first dis- 

 covered and named by Mr. Say. It is confined to the plains along the east 

 base of the Rocky Mountains in Colorado. 



CEdipoda, even as at present generically restricted, is the widest spread 

 genus of the entire family, and to it belong the earliest geological remains 

 of the flimily. It contains some of the most destructive species of the eastern 

 continent ; but in North America only one species [CE atrox) is known to be 

 migratorjp, and this is confined, in its migrations, to California. 



CE. Carolina, the most common and perhaps the best known species, is 

 found everywhere throughout the United States, unless it be California; and 

 I presume it is found there, but, so far, I have no positive evidence of it. 

 Throughout this broad extent of comitry and the widely differing climates, it 

 varies very little from its eastefn type, not enough to constitute a variety. 



If CE. corallipes, haldemannii, paradoxa, rugosa, and discoidea be con- 

 sidered as varieties of but one species (discoidea), SiS future investigations may 

 prove to be the case,* then it will have to be counted as one of the very com- 

 mon and generally distributed species of this ubiquitous genus. CE. rugosa 

 is found from New England to Dakota and south to the Potomac and Ohio ; 

 CE. . corallipes and kaldemarinii, from Eastern Nebraska to Utah ; CE. 



* See my discussion of tbis question in Hayden's Geol. Surv. Territories, 1872, p. 720. 



