796 PROCEEDINGS OF THE NATIONAL MUSEUM. 



spicuously marked n_yniphs are no less striking in appearance than the 

 mature individuals, in fact being easier seen at a distjince than the 

 imagoes. 



An apparentW unrecorded fact regarding this species was noted in 

 the field. Both sexes, but especially the males, when disturbed make 

 a distinct simmering or bubbling sound, high-noted, })ut of small vol- 

 ume. Upon investigation, this sound was found to proceed from a 

 gland. proba))ly a modified spiracle, opening from the side of the body 

 above and slightly behind the middle coxa;. The sound is produced 

 by the insects forcing out very minute bubbles of a clear liquid, caus- 

 ing a sound sufficiently loud to be heard for some distance. Whether 

 this liquid has repelling properties and the resulting sound purely 

 mechanical, or whether the production of sound is the main o))ject of 

 the mechanism, was not determined. 



84. SCHISTOCERCA ALUTACEA Harris. 



Acridium alutacea IIakkls, Ins. Inj. Veg., 1841, ]>. 13i). 



One female specimen at Grand Junction August 17, and one male ])y 

 Oslar, labeled "Colorado." 



85. SCHISTOCERCA AMERICANA Drury. 



(JryUtm (nnericamt Drury, III. Nat. Hist., I, 1770, i>. 128, pi. xlix, fig. 2. 



This species is quite common at times in the cotton fields of Texas. 

 Several specimens were taken at Victoria in June and Jul3\ 



86. SCHISTOCERCA OBSCURA Fabricius. 



(iriilliiH oljKcnrd Fabricics, Suppl. Ent. Syst., 1798, p. 194. 

 One large female from Quero, Texas July 11. 



87. SCHISTOCERCA SHOSHONE Thomas. 



Acridium i^hoshoiie TnoMAS, Proc. Acad. Nat. Sci. Philad., 1873, p. 165. 



Two large females from Yuma, Arizona, and one male from Phoe- 

 nix, Arizona. Immersion in alcohol seems to discolor these insects to 

 a consideral)le extent, changing the green to light brown and the color 

 of hind tibia3 from red to yellow. 



88. PARAIDEMONA MIMICA Scudder. 



Paraideniona miinica Scudder, Proc;. U. S. Nat. Ivlus., XX, 1897, pp. 42, 4;!-44, 

 ])!. Ill, %. 10. 



]\Iany specimens of both sexes in cotton fields in the vicinity of Vic 

 toria, Texas, in June and July. This seems to be the common spcn-ies 

 in that section of the State, no other species being represented among 

 the many specimens examined. It is quite variable, both in size and 

 coloration. 



