396 PROCEEDINGS OF THE NATIONAL MX'SEVM. voi..xxni. 



remaining interplical ridges (Plate XXI, fig. -t, R and (t). None of 

 these radiate veins are especially prominent nor enlarged medianly, 

 as in C/reotetti.i' (Plate XXI, tig. -t). The posterior femora are moder- 

 ately developed, with outer face plain or banded and the inner face and 

 lower sulcus black, with one or two light bands on the apical half; or 

 by the fading of the black these markings are modified and may be 

 wanting, especially in the lower sulcus. Posterior tibia? with eight to 

 ten spines on the outer side. 



The genus was established b}^ Stal ^ and fully defined first l)y 

 Saussure.^ The genus as here defined includes a considerable number 

 of species which have usually been referred to Conozoa. This transfer 

 has been necessary in order to retain this genus, which is still scarcely 

 separable from Trimerotrojph^ but useful, as it contains a few forms 

 widely different from typical forms of the latter genus. The ffyaJhui 

 group of Trirnerotroj)!s may be considered the connecting link between 

 these genera. Near the other end of this series in the linear arrange- 

 ment I have adopted the Fallax grou^ form, a transition to drcotettii', 

 which is distinguished from Trlmerotroj)!-'^ chiefly by the structure of 

 the wings. The Texana group forms a transition to Derotmena and 

 the Clirina group to Iladrotettix. 



The genus is confined to the continents of North and South America, 

 and its characteristic habitat is the semiarid regions of the West, 

 though a few species are found east of the Mississippi River. These 

 species, however, are restricted to the sand}^ shores of rivers or ocean 

 to the bare ground of roads, or to barren, rocky hillsides. 



Of the 54 species enumerated 24 are new. Sixteen species are con- 

 fined to California, as follows: hyalina^ Tebellis^ albolineata, pm^recta,, 

 coquilletti, calignosa^ albescens^ I'oehelei, thalassica, cali/ornica, iJacif- 

 ica^ jnlosa^ faUax^ coiujyerm^ tKiriegatd^ and pseudofasciata. Three 

 others are confined to the Pacific coast within the United States — 

 caeruJeipes, hifasclata^ and shnills. Three are found east of the JSIis- 

 sissippi — maritima^ saxatilix^ and citrina. The last mentioned extends 

 from the Rocky Mountains to Maryland. The first mentioned is 

 restricted to the Atlantic coast and the shores of the Great Lakes, and 

 saxat'dls is found in northwest Arkansas and southern Illinois. Five 

 species are not found within the limits of the United States. These are 

 tolteca^ ocliraceipennh^ jxdUdipenrik^ laufa, and colhirls. The remain- 

 ing species, 27, belong to the Rocky Mountain States. Montkola 

 extends from Colorado into Mexico, and pistrlnarla from Texas into 

 Mexico. Oincta ranges from California to Texas. Trxana ranges 

 from Texas to New Mexico; crktata from Lower California to Salt 

 Lake Valley, Utah; latifmciata from Utah to Washington; caerulei- 

 jjennis from California to Wyoming. Three species, salina, agres- 



' Recension Orthopterorum I, 1873, pp. 118, 134. 

 ^ Prodromus Oedipodioruni, 1884, p. 166. 



i 



