the Tctriginc'G in the Oxford University Museum. 415 



6rt. T. amerieana dimorpha, form nov, 



A smaller less robust form, having short wings and abbreviated 

 pronotum, but having other characters similar to the preceding. 

 The frontal costa very little sinuate between the eyes, in profile the 

 vertex obtuse angulate, not so acute as in brunneri or granulata, and 

 easily distinguished from either of these and other N. American 

 Tetrix. The dorsum smoothly granulate, the elytra small, the apices 

 narrowly rounded, the pronotal process posteriorly acute, not reach- 

 ing to the apex of posterior femora ; wings shorter than the jironotal 

 apex. 



Entirepength of body, male and female, 8-10 mm.; j^roiiotum 7-8 

 mm. ; posterior femora 5 "3-6 -8 mm. 



Four examples from the same collection as the preceding, 

 and from the same locality. 



Genus Nomotettix, Morse. 

 1. N. validus, sp. nov. 



Distinguished from all the other species by the stouter form in the 

 female, the obtuse conical vertex in profile, strongly produced 

 beyond the eyes, and the absence of excavation of frontal costa 

 between the eyes. Body granulate, colour variable as in cristatiis. 

 Vertex nearly twice the width of one of the eyes, viewed from above 

 obtuse angulate produced beyond the eyes, the frontal transverse 

 carinulae on each side roundly flexed or bent backward, little com- 

 pressed ; vertex narrowed forward but little ampliate between the 

 carinulae, on each, side foveate, posteriorly mammillate, median carina 

 somewhat incrassate, prominent, in profile elevated above the eyes 

 and arcuate, anteriorly roundly produced ; frontal costa widely sul- 

 cate, in profile united with the vertex, strongly obtuse-conical, not at 

 all excavate between the eyes, declivous below, and at the median 

 ocellus barely sinuate ; vertex advanced beyond the eyes, equal to 

 about four-fifths the width of one of the eyes ; posterior ocelli con- 

 spicuously placed, uncovered midway between the frontal costa and 

 front man^gin of the eyes. Pronotum compresso-cristate, the front 

 margin obtuse angulate produced over the head, not so acute as in 

 cristatus ; median carina arcuate forward, dorsal margin straight 

 between the humeral angles and somewhat convexly sloping pos- 

 teriorly ; humeral angles widely rounded ; process posteriorly 

 cuneate, extended backward nearly to the apices of the posterior 

 femora ; the superior siims of lateral lobes shallow, posterior angles 

 narrowly rounded. Elytra elongate, apices very narrowly rounded 



