AMERICAN COLEOPTERA. 237 



longed in the female, lateral margin acute, narrowly reflexed, disc flat, sides 

 declivous, surface with three distinct costse extending from the base to apex 

 and a short humeral carina, atapical third between the outer costae a tuberosity, 

 intervals densely and moderately coarsely punctured with distant coarser 

 punctures close to and on each side of the costse, epiplcural fold narrow. Body 

 beneath sparsely' punctate, clothed with brownish hair. Length* .64 — .92 inch ; 

 16— 23 mm. (PI. V, fig. 2.). 



Male. — Anterior tarsi moderately dilated, anterior tibiee slightly sinuous on 

 the inner side, the femora with two teeth near the apex, one on each border, 

 that in front larger. Middle tibiae slightly arcuate. Posterior femora large, 

 inflated and with a broad tooth near the tip on the posterior border, the 

 tibiae strongly arcuate with a triangular dilatation near the tip and the apical 

 angle in front of the tarsi prolonged. Apex of elytra obliquely truncate but 

 not prolonged. 



Female. — The anterior tarsi are slender, the tibiae not sinuous, the femora 

 without teeth. The middle tibiae are slightly arcuate. The posterior femora 

 are slender and simple and the tibiae nearly straight, the apex not prolonged 

 in front of the tarsi. The elytra are more obliquely prolonged. 



Males occasioually occur with the sexual characters almost entirely 

 undeveloped, differing in no respect from the female except that the 

 anterior tarsi are feebly dilated and the tip of the posterior tibia is 

 prolonged in front. 



This species is the nearest approach in many respects to Xecro- 

 phorus, and the discal elevation of the thorax is a feeble imitation 

 of that genus. 



Widely distributed in the Atlantic region. 



S. triincata Say. — Moderately elongate, black, depressed, surface sparsely 

 clothed with fine black pubescence. Head moderately constricted behind the 

 eyes, the occiput transversely impressed, surface densely punctured and finely 

 pubescent. Labrum broadly emargiuate. Antennae black, club elongate-oval, 

 of five joints, the first two glabrous, the terminal one-half longer than the 

 tenth. Thorax one-third wider at base than long, narrowed in front, apex 

 feebly emarginate, sides slightly arcuate, basal angles obtuse, base trisinuate, 

 disc moderately convex, sides posteriorly vaguely deplanate, surface densely 

 punctured and finely pubescent. Scutellum densely punctured. Elytra as wide 

 at base as the thorax, slightly wider posteriorly, sides feebly arcuate, margin 

 narrowly reflexed, apex squarely truncate, disc rather flat, sides gradually 

 arcuate, surface subopaque sparsely punctulate and pubescent, sometimes with 

 faint traces of the two inner costae and a slight tuberosity. Abdomen above 

 densely, beneath more sparsely punctate and pubescent. Body beneath moder- 

 ately densely punctured. Epipleural fold of elytra rather narrow. Length 

 .50— .60 inch : 12.5—15 mm. 



The male has the anterior tarsi moderately dilated and the abdomen 

 much more prolonged beyond the elytra than the female. 



* These measurements are taken from the head to the tip of the elytra, the 

 abdomen being so variably retracted or protruded as to give unreliable mea- 

 sures. This course is followed in all the species of this genus. 



