164 OKTHOPTEKA. 



Hob. North America, California, probably in the vicinity of Indio (coll. L. Bruner). 



A single female. This and several other interesting locusts are contained in a small 

 collection of insects made by Mr. Leon La Forge between Yuma and Los Angeles. 

 None of them bear definite locality-labels.] 



[6. Dissosteira planipennis, sp. n. 



In form and size very similar to the preceding species, but differing from it in the slightly smaller size, the less 

 conspicuous longitudinal median carina of the vertex, and the lower median carina of the pronotum, and 

 also in the absence of a transverse dusky band on the wings, where only a trace of the fuliginous colour 

 is apparent along the anterior margin towards the base. The disc of the pronotum is coarsely granulose, 

 and the sides are but little higher than long. The hind femora are slender and definitely banded, while 

 the hind tibiae are testaceous and rather more strongly spined and spurred than usual. 



Length of body, $ , 19 ; of pronotum 4-5, of tegmina 19, of hind femora 12 millim. 



Hob. North America, Southern California, between San Diego and San Bernardino 

 (coll. L. Bruner). 



Taken by Mr. Leon at La Forge. The present species may be congeneric with the 

 insect described by me as Scirtetica occidentalis, which is included in that genus as 

 here treated. The only specimen of that species in collections, so far as known to 

 the present writer, is the type which is in the U.S. National Museum in Washington.] 



SPHARAGEMON, Scudder. 



Gryllus, Say, Journ. Acad. Nat. Sci. Philad. iv. p. 307 (1825) (in part.). 

 (Edipoda, Latreille et auct. (in part.) . 



Spharagemon, Scudder, Proc. Bost. Soc. Nat. Hist. xvii. p. 468 (1875). 

 Dissosteira (Spharagemon), Saussure, Prodr. (Edip. p. 135 (1884). 



The genus Spharagemon is confined to North and Central America, where about a 

 dozen species occur. Some of these are distributed in arid localities, while others 

 may be taken in rather humid regions. At least one half of them belong to the 

 fauna of the region under consideration in the present paper. As will be seen 

 by a reference to the following synoptic table, it is composed of species showing 

 considerable variation among themselves. 



Table for separating the Species of Spharagemon. 



A. Carina of pronotum equally compressed throughout ; the disc flat in 

 longitudinal section. Hind tibiae generally annulate with fuscous. 

 b. Hind tibise plainly annulate with fuscous. 



c. Head and body somewhat compressed. Metazona less than 



twice as long as the prozona 1. bolli, Scudd. 



cc. Head and body robust. Metazona more than twice as long as 



the prozona 2. robustum, Morse. 



bb. Hind tibise very faintly, if at all, annulate with fuscous ... [3. inornatum, Morse.] 



