4 i*BtK:Et:ins(is or the sational misjcim. vouxx 



Hpcrics tVoiii South AriKM'ica; hut in the prt'Ncnt paper t'liil coiisideriition 

 will h<' ix'VtMi only toth«* Noitli Amcriran species; jitahle will, however, 

 be H<hhMl for the (leteiiniiuitioii of the Ohl Worhl species in their place. 

 aixl the 8outh Auierican forms will he merely tabulated at the close, 



a ('Off to pin ot I (lintrilmtioH. — The Melancjpli are an almost t'xclusively 

 American group; a singh' j;enus, rotlixnto, is represented in the Old 

 Woild (and more abundantly than in the New) north of .{.T^ north lati 

 tude. With that exception alnmst all tin* jjeneraand specie** urecontined 

 to North America. South America ]>ossesses four ;j:enera ( not included in 

 the juesent paper) — Dichrophtn^ Srotusna^ Scopan, and A tnichelacris, with 

 ab(»ut twenty known species mostly referred to PichmpluH, besides 

 ruruilichrtr '.uH^ with four species in l*aragruay. The remaininj;^ genera 

 are exi'lusively North American, but eleven of them — X(tnt,s(>nH(. 

 ]*har(h'ot('ttij'y Cointliutra^ IlaryfrttiXj Plutnlotrttu'^ Ciplmhftetti.i,, h'lmh 

 ilotettix, (JycUnrnns^ Sinaloa^ Aidcmonn, and PhUorleon^ with uinetecn 

 species, besides two species of the 8(»uth American genus Paradivhro 

 plus, are found exclusively in Central America and Mexico, or only i)a8s 

 the borders of the United States narrowly. 



All of these Central and South American genera (with the single 

 exception of /V<t7o(7ro/<) belong to the division of Melanojdi in which 

 the lateral margins of the subgenital plate of the male are not at all 

 anji>liateatthebase; and they comprise all but three of the genera belong 

 ing to that section, these three being GymnoficirtHes with <me species in 

 Florida, 1 1 ypovhlora with one species from the Canadian border to Kansas 

 and Colorado, and VumpiiUunntha with four species, three ranging 

 from ^Nebraska to Texas and one fouiul in Mexico. The great bulk of 

 the species and most of the genera (including all but one — PhUockon — 

 of those belonging in the section with ami)liate basal margins to the 

 subgenital idate) are contined to the United States and Cauada, where 

 they form one of the dominant types of Acridiidae. 



This division, that with ampliate basal margins, is represented (apart 

 from Fhiloclcon with its single species) by fourteen genera and one hun- 

 dred and seventy-nine species, of which only four genera occur south 

 of our border, with thirteen species confined to Mexico, and twelve 

 others found both in Mexico and the United States; leaving ten genera 

 wholly, and four others abnost wholly, belonging to the more northern i 

 region, with one hundred and sixty-six species. No species of either j 

 division are found in tlie Antilles. 



With tritling exceptions, then, the division with nonampliate basal 

 margins to the subgenital plate is characteristic of Central and South 

 America— or subtropical and tropical America — while the other divi 

 sion. vastly more important, is characteristically temperate North 

 American, with oneoutlier intemperate Europe Asia. 



The dominant genus is Melanoplus with one hundred and thirty one 

 species described in the present paper; a number more are known to 



