144 OETHOPTEEA. 



many localities it is one of the destructive species. The following synonymy will at 

 once indicate the variability that exists in this insect. 



l. Camnula pellucida, Scudd. 



(Edipoda pellucida, Scudd. Jburn. Bost. Soc. Nat. Hist. vii. p. 472 (1862) l . 



(Edipoda (Camnula) pellucida, Prov. Faune ent. Canad. ii. p. 40 (1877) 3 . 



Camnula pellucida, Scudd. in Hitchcock's Geol. N. H. i. p. 378 (1874) 3 . 



(Edipoda atrose, Scudd. Rep. U.S. Geol. Surv. Nebr. p. 253 (1872) \ 



Camnula tricarinata, Stal, Recens. Orthopt. i. p. 120 (1873) 5 . 



Stenobothrus obiona, Thomas, Ann. Rep. U.S. Geol. Surv. Terr. ii. pp. 266, 279 (1871) e . 



Camnula pellucida obiona, Cockerell, Trans. Amer. Ent. Soc. xx. p. 337 (1894) 7 . 



Bab. Nokth America, California, Arizona, and New Mexico, in the mountain 

 valleys 1-7 . 



This species is certainly found in the mountains of Northern Mexico also, although 

 we have at present no records of such occurrence.] 



HIPPISCUS, Saussure. 



Hippiscus, Saussure, Rev. et Mag. Zool. (2) xiii. p. 398 (1861) ; Scudder, Psyche, vL pp. 265 &c. 

 (1892). 



The members of this genus, with perhaps a single exception, are confined entirely 

 to North America. Hippiscus, however, is best represented in the vicinity of the 

 boundary between Mexico and the United States, where a rather large number of 

 species occur. Several of these insects enjoy a wide distribution, in some instances 

 ranging from Central Mexico almost, or quite, to the Saskatchewan "River, and from the 

 interior basin of Utah to Florida and the New England States. With a knowledge of 

 this extended range of certain species in mind, it is thought best to enumerate all the 

 forms that are known to occur in the territory lying within a short distance to the 

 northward of the country included within the scope of this work. 



As a rule, the representatives of the genus Hippiscus are rather large and robust, 

 being among the largest forms belonging to the subfamily. Some of the species live 

 over winter as nymphs, and are therefore among the first mature locusts to appear in 

 the spring. Both red- and yellow-winged individuals are to be met with ; but generally 

 the individuals of each species are all either the one or the other as regards the wing- 

 colour. Like many others of the (Edipodine genera, Hippiscus is rather characteristic 

 of arid and semiarid regions. The genus may be separated into three well-defined 

 sections or subgenera, viz., Hippiscus, Sticthippus, and Xanthippus. These sections, 

 together with the species treated, may be recognized by the following table. 



