Sept., 1912.] Matheson : Haliplid^ of North America. 173 



Key to the Species of Peltodytes. 



A. Each elytron with a prominent tubercle callosus Leconte. 



AA. Each elytron without such a tubercle. 



B. Elytra each with nine rows of punctures festivus Wehnke. 



BB. Elytra each with ten rows of punctures. 



C. Femora of posterior legs entirely dark brown or rufous. 



D. Apical margin of elytra sinuate truncate. ..yiHf/'/^.i' Leconte. 

 DD. Apical margin of elytra not sinuate truncate, at most 

 rounded or slightly sinuate. 



E. Median spot of elytra broadly confluent with sutural 



stripe ; punctures of posterior half of elytra not so 



deep and more irregular than basal half. 



F. Species with very large black markings on elytra, 



almost crowding out the pale yellow ground 



color; a prominent irregular line of punctures 



between the first and second rows of punctures 



extending almost to the ha.se. .. .floridensis n. sp. 



FF. Species not with such large black markings ; no 



such prominent line of punctures between the 



first and second rows of punctures, only a few 



scattered ones present and these are behind the 



median black spot piuticus Leconte. 



EE. Median spot of elytra not broadly confluent with the 

 sutural stripe, but rarely touching it ; punctures of 

 the posterior half of elytra not as in the foregoing. 



peduncidatus Blatchley. 

 CC. Femora of posterior legs never entirely dark brown or rufous. 

 G. Posterior femora ringed with yellow at distal ends. 



H. Vertex immaculate duodecimpunctatus Say. 



HH. Vertex with a prominent black spot, .edentulu^ Leconte. 

 GG. Posterior femora entirely yellow litoralis n. sp. 



Peltodytes callosus Leconte. 



Cneinidotus callosus Leconte. Ann. Lye. Xat. Hist., V, 1852, p. 201. 



General color pale yellow with black markings on pronotum and elytra. 

 Length 3.5 mm. 



Head punctate, the vertex brownish black to black ; labrum not emargi- 

 nate ; eyes nearly circular in outline; antennae testaceous. 



Pronotum with two black basal spots, punctate, the disc sparsely so ; 

 punctures of the same color as pronotum except those between the basal 

 black spots which are sometimes black. Prosternal ridge margined, strongly 

 constricted in the region of the prothoracic legs, widening anteriorly, 

 grooved at point of constriction, strongly convex longitudinally, sharply 

 declivous in front. Posterior coxse punctate, reaching the last segment of the 

 abdomen ; the last abdominal segment triangular in outline and impunctate. 



