REHN AND HEBARD 69 



We have described below a male taken about twelve miles from 

 one of the type localities. 



Description. — c? ; Orizaba, Vera Cruz, Mexico. December, 1887. (L. 

 Bruner.) [Hebard Collection] 



Size medium for the genus, form very attenuate but not as attenuate as in 

 /. phthisica. Head and eyes very similar to those of that species. Prono- 

 tum with dorsal length about one and one-half the greatest (caudal) dorsal 

 width; dorsum of pronotum, lateral carinae and cephalic and caudal mar- 

 gins of same similar to phthisica, but the general form shorter as shown in 

 the proportions given above; lateral lobes of pronotum with length distinctly 

 greater than depth, similar to phthisica but general form shorter in accord 

 with the less attenuate structure of the insect, very little longer and consid- 

 erably shallower than in /. tolteca, although not as shallow as in phthisica. 

 Tegmina similar to those of phthisica but not so attenuate, with larger mar- 

 ginal field. The tegmina reach beyond the distal extremities of the caudal 

 femora. Disto-dorsal segment of abdomen very broadly arcuate caudad, 

 median section showing a considerably depressed area bounded on either 

 side by straight carinae which are convergent cephalad; supra-anal plate 

 small, trigonal, with lateral margins somewhat convex; cerci medium in 

 length for the genus,-* not as robust but longer than in /. tolteca, less slender 

 and shorter than in phthisica, tapering rather sharply at base then gradually 

 to the apex which is somewhat flattened above and armed with a tooth, this 

 tooth directed meso-dorsad at an angle of a little more than ninety degrees 

 to the distal portion of the cercus; subgenital plate as in phthisica with 

 elevations and produced portions slightly less pronounced.^' Limbs not 

 so long and slender as in phthisica, but otherwise similar.™ 



A female bearing the same data as the male here described furnishes the 

 additional information given below. 



Description of Female. — Quite similar to male in size and general appear- 

 ance. Tegmina do not reach the distal extremities of the caudal femora. 

 Ovipositor similar to that of tolteca except that it is somewhat less broad ; 

 subgenital plate elongate-lanceolate with immediate apex very narrowly 

 acute-angulate emarginate, the plate showing a widening sulcation in the 

 proximal two-thirds and embracing weakly the base of the ovipositor. 



So few specimens are known of this species and of phthisica that little 

 can be established concerning the relative proportions of the two species. 



2* Brunner in his original description states that the cerci of this species 

 are very long. This is due to the fact that, when the present species was 

 described, all of the known males of the other species of the genus possessed 

 short cerci with the exception of fasciata, which species does not belong in 

 the genus. 



2^ See foot note regarding the distal extremity of this plate under the 

 description of /. phthisica. 



^° See footnote 26 on page 66, concerning the variability of the arma- 

 ment of the cephalic femora. 



TRANS. AM. ENT. SOC, XL. (6) 



