86 ORTHOPTEROUS GROUP INSARAE 



1909. Hormilia elegans Rehn and Hebard (not of Scudder, 1900), Proc. 

 Acad. Nat. Sci. Phila., 1909, p. 474. [Cottonwood, San Bernardino 

 County, California.] 



The authors have in the past most unfortunately confused the 

 present species with /. elegans, to which it shows a definite relation- 

 ship, but from which it differs not only in a number of minor charac- 

 ters but also in the strikingly different pronotum, the more abruptly 

 narrowing marginal field of the tegmina, the general coloration, 

 and the very different color pattern. Moreover, although the two 

 species show probably closer relationship to each other than to any 

 of the other species of the genus and are found in distribution to 

 overlap over a wide area, still they may be readily distinguished 

 from each other by their stridulation, and while I. covilleae is only 

 found upon the creosote bush (Covillea tridentata), elegans is almost 

 never found on that plant but inhabits a large variety of other 

 desert bushes which grow especially along washes in the desert. 

 The large and conspicuous white or pale greenish spots on the teg- 

 mina of the present species and the extremely sellate pronotum, 

 may serve to separate the insect easily from all other known species 

 of the genus. 



Tyi)e. — -d^; Tumamoc Hill, Tucson Mountains, Pima County, 

 Arizona. October 3 to 4, 1910. Elevation, 2500 feet. (R. & H.) 

 [Hebard Collection.] 



Descriplion of Type. — Size and form much as in elegans. Head with 

 greatest width contained about one and four-fifths times in the greatest 

 depth, except for the somewhat narrower proportions very much like that 

 of elegans; eyes large, more prominent than in elegans, ovate in outline, 

 in length slightly exceeding the infra-ocular portion of the genae. Prono- 

 tum with dorsal length about one and six-tenths times the greatest (caudal) 

 dorsal width; dorsum of pronotum deeply sellate; lateral margins^^ of dor- 

 sum of pronotum diverging in the cephalic fifth, then sub-parallel for one- 

 half the remaining distance, from that point strongly concave-divergent to 

 nearly the caudal margin where a slight convexity is noticeable, these parts 

 of the lateral carinae joining without angulation and the carinae much less 

 sharply defined and in section more broadly rounded than in elegans; ce- 

 phalic margin of dorsum of pronotum almost straight, caudal margin of same 

 strongly arcuate, this margin with a decided convexity ventrad and having 

 the inner edge of this convexity sub-angulate; lateral lobes of pronotum with 



^^ The lateral margins of the dorsum of the pronotum in this species ap- 

 pear to the naked eye even more arcuate than in elegans but not as pro- 

 nounced. 



