The Pselaphid^ of North America. 227 



Clypeus swollen, convex, subangulate anteriorly. Antennae 

 robust, one-half as long as the beetle, first joint about two- 

 thirds as long as the frontal margin, cylindrico-conical; second 

 smaller, of the same shape, two-thirds the length of the first, 

 third and fourth equal, shorter than the second, and nearly as 

 wide. Fifth and sixth, in the male, globose, wider than the 

 fourth. Seventh, eighth, ninth and tenth, globose, the last two 

 each equalling the third, which slightly exceeds the seventh, 

 this being again exceeded by the eighth; eleventh subglobular 

 a Httle wider than the tenth, and bluntly pointed. In the 

 female these joints are subequal, subglobose, a little longer 

 than wide, and becoming almost imperceptibly larger towards 

 the tip. Palpi with the first joint very small, quadrate, second 

 more than half as long as the head, small at base gradually 

 increasing in width, sigmoid; third pedunculate, lamellate, 

 fourth with the lamella opposite, and as long as, that of the 

 third, the two resembling the cotyledons of a bean. Pro- 

 thorax campanulate length and width equal to that of the 

 head including the eyes, sides evenly arcuate, becoming 

 straight and parallel posteriorly, base a little less than twice 

 as wide as the neck, with a fine impressed fine around it; 

 disk evenly vaulted, pubescence radiating from the center. 

 Elytra across the shoulders one-half wider than the base of 

 the prothorax; at the widest point which is just two-thirds of 

 the length from the base they are just one-half wider than the 

 breadth of the shoulders. Anterior half of the disk flat, tip 

 and sides obliquely declivous, sutural lines nearly parallel, 

 discal lines sulciform with flat bottoms, and evanescent near 

 the middle of the elytral length. Shoulders prominent. 

 Abdomen at base one-eighth narrower than the greatest 

 width of the elytra, and as long as the width at the shoulders, 

 very convex, broadly margined. First segment one-fourth as 

 long as the basal width, sides divergent, a deep transverse 

 impression near the middle of each half of the base. Ventral 

 segments equal in length with no perceptible sexual differences. 

 Legs long, slender, anterior femora with three spines. Tarsi 



