76 ORTHOPTEROUS GROUP INSARAE 



sutural margin of the tegmina diagonally are paler, while in others 

 only a few of these veins are so defined. 



Distribution. — The present species has been taken from San 

 Antonio and Benavides, Texas, westward to the region where it 

 mingles with I. elegans consuetipes along the low divides east of the 

 Colorado River in Arizona. The most northern record is Pueblo, 

 Colorado, west of which locality it has not been taken north of 

 southern New Mexico and central Arizona. We have but one 

 Mexican record, Tlahualilo, in northeastern Durango, though the 

 species is probably widely distributed over all northern Mexico ad- 

 jacent to the United States from the Gulf of Mexico to the Gulf of 

 California. 



Biological Notes. — From our field notes we find that this species 

 is very partial to mesquite, having been found in that bush at 

 almost every locality at which it was taken. At Uvalde, Texas, 

 the notes state that these insects were stridulating in numbers 

 soon after dark on mescjuite, but later in the night fewer were to be 

 heard. Dog Caiion, Brewster County, Texas and Deming, New 

 Mexico, are the only localities at which we have taken specimens 

 attracted to light at night. The favorite habitat of the s})ecies 

 when found in the desert is the heavier vegetation along usually 

 dry washes. Our notes for Snyder's Hill, Pima County, Arizona, 

 afford the following information, "Greasewood (Covillea tridentata) 

 flat where mesquite {Prosopis velutina) and an acacia {Acacia greggii) 

 predominated along the dry washes. Elegans kept up a whirring in 

 the two latter bushes (after dark) , this sound had no harshness and 

 could be heard scarcely over five feet distant. About every fifth 

 bush examined after dark contained one of these singers. " 



The capture of a few specimens of this species in the creosote 

 bush {CoviUea tridentata), at El Paso, Texas, was surprising, as at 

 no other place was it found on this bush, which is the host-plant 

 of the monotropic I. couilleae. 



SpechneiiH Examined: 89; 51 males, 32 females and 6 nymphs. 



San Antonio, Texas, 1885, (M. Newell), 1 9 , [Hebard Collection ex Bruner] : 

 August 15, 1912, (R. & H.), Icf, IcTn. 



CotuUa, Texas, August 13, 1912, (R. & H.), Ic?. 



Benavides, Texas, August 9, 1912, (R. & H.), 3c?, 1 9 . 



Laredo, Texas, August 12, 1912, (R. & H.), 3d^. 



Uvalde, Texas, August 21, 1912, (R. & H.), Ic?. 



Del Rio, Texas, August 22, 1912, (R. & H.), Id'. 



