JAMES A. G. REHN 197 



of the eye, with a i)air of transverse ridges, the caudal of which has hifjh lateral 

 spiniform and lower median paired tubercles; fastigium stronglj- compressed, 

 sulcate, moderately declivent, the usual interantennal projection distinct hut 

 not strong: frontal costa sulcate, slightly wider for a distance ventrad of the 

 median ocellus than dorsad of the same, the ventral half of the ventro-ocellar 

 section again widened and the immediately ventral portion sharply expandin'g, 

 lateral carinae of the frontal costa develojied into a pair of low, subspiniform 

 lobes half way between the ocellus and the clypeal suture; genae roughened 

 with a vertical obtuse-angulate impression; ej'es globose, projecting, subcircular 

 in basal outline; antennae depressed. Pronotum of the type found in nearly 

 all of the species of this genus (i. e. all excepting S. kiugii), the greatest width 

 of the dorsum of the metazona subequal to the greatest length of the pronotal 

 disk; cephalic margin of disk very weakly arcuate; caudal margin roughly 

 arcuate; the cephalic margin unarmed; the caudal margin with three j)airs of 

 acute spiniform processes, the median pair quite long and all disposed at right 

 angles to the margin proper; lateral carinae strongly indicated caudad of the 

 median sulcus, sublamellate, serrato-dentate, produced laterad; surface of 

 disk strongly scabrous, the lines of acute tubercles on the metazona radiating 

 caudad and laterad; median carina caudad to the median sulcus elevated into 

 a greatly inflated crest, which in height is nearly equal to the depth of the lateral 

 lobes of the pronotum, when seen from the side this is roughly rounded in out- 

 hne, slightly overhanging cephalad and caudad, and with its margin divided 

 into three sections by irregular emarginations, lateral faces of this inflation 

 covered with spiniform tuiieroles, median carina on the metazona subobsolete: 

 lateral lobes of the pronotum with the greatest dorsal length ver\- slightly 

 greater than the greatest depth; cephalic margin of the lobes very weaklj^ 

 obtuse-angulate, ventro-cephalic angle nearly rectangulate, ventral margin 

 sinuato-truncate, moderateh- oblique, ventro-caudal angle rectangulate, 

 weakly produced, caudal margin somewhat oblitjue, nearly straight; surface of 

 lateral l()t)es rugoso-tul)(>rculate, these structures becoming linear in di>^position 

 caudad and there produced into spiniform projections, which, to the number of 

 three or more, are strongly developed, near the cejjhalic margin of the lobes 

 is present a median si)iiiif()rm tul)ercle. Tegmina falling short of the apex of the 

 abdomen, in fact not reaching the femoral ajjices, in length being hardly twice 

 as long as the median line of the pronotal disk, lanceolate; marginal fiekl moder- 

 ately expanded at proximal third, narrowing distad; costal margin straight from 

 the point of greatest width of marginal field to near the apex, where it is gently 

 arcuate; sutural margin in general straight; apical margin acute with the 

 innnediatc apex very narrowly rounded; texture of tegmina and areolation of 

 the same as in the other species of the genus. Wings reduced, when in repose 

 but slightly surpassing the middle of the tegmina. Prosternum with the pro- 

 jection of the cephalic margin erect, subspiniform. dejjlanate on tlie cephalic 

 face; interspace between mesosternal lolies strongly transverse, shallow, the 

 greatest width over twice as great as the greatest deptli, lobes broadly roundcnl; 

 interspace between the metasternal lobes distinctly greater than that between 

 the mesosternal lol)cs, very shallow, the loiies rotundato-rectangulatc, cephaUc 



TR.\NS. AM. ENT. .SOC, XLIV. 



