412 ' PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



In coloration very similar to Trimerotropis maritima, but smaller, 

 and distinct from that in the different venation of the wings. 



Saussure in his conspectus of the species of Trimerotrojns includes 

 this in the groups having blue {marithna is also in this group, so his 

 blue probably means any color but red, the other alternative) hind 

 tibiie. 



Chile, South America, Saussure. 



TRIMEROTROPIS GRACILIS Thomas. 



OEcUpoda gracUis Thomas, Geol. Surv. Terr., 1871, p. 461; Acrid, of N. Am., 



1873, p. 121. 

 Trimerotrnpis graciiifi f^AVfifiVRK, Prodr. (Edip., 1884, p. 171. 



Size medium or large; color dull grayish brown. Scutellum with 

 the median carina slight but distinct. Pronotuni with the median 

 carina somewhat cristate on the metazone; lateral carinje distinct, 

 except between the sulci. Metazone scarcely twice as long as the 

 prozone, with the process slightly o])tuse or acute angulate, the 

 margins straight and the tip sharp. Tegmina plain, except for an 

 indotinite cloudiness basally and irregular and broken linear infusca- 

 tions of the principal veins and their branches; last branch of the 

 radial sector distant from the fork one-third (male) or one-fourth 

 (female) the length of the sector; intercalary vein separated apically 

 from the median by scarcely more than its own width; cubital and 

 median veins free or connected by a short cross vein; area of the cub- 

 ital forks narrow, occupied, basally at least, by a single series of 

 quadrate cells. Wings long, twice as long as wide, scarcely attenuate 

 at the apex; disk faintW greenish yellow, followed by a narrow fus- 

 cous band much broken and indistinct, often indicated by a darkening 

 of the veins merely, continued for a very short distance on the pos- 

 terior border, spur extending much more than half way to the base; 

 apex h3"aline, with the extreme tip sometimes slightly infuscated, but 

 generally all the veins and cross veins are darkened. Posterior femora 

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

 with one light preapical band; oiiter surface plain or obsoletely banded. 

 Posterior tibiee brown, without any su])basal annulus. 



Ijength of the body, male, 21 mm., female, 2-1 to 30 mm.; length of 

 the tegmina. male, 22 mm., female, 25 to 30 mm.; length of posterior 

 femora, male, 10^ mm., female, 12 to 11 mm. 



One male, one female. Birch Creek, Idaho, August; one female, Salt 

 I.<ake Valley, Utah. Bruner collection: One female, Salmon City, 

 Idaho. August. The U. S. National Museum contains specimens from 

 Douglass, Wyoming; Yellowstone, jSIontana and Colorado. Colorado, 

 Saussure. 



