THE PsELAPHIDZ OF NorTH AMERICA. 23% 
angular, fourth triangular, free side emarginate, appendages 
setiform, short. Body variolate. 
T. costauis, Lec. Piceous, shining, pubescence short, ap- 
preseced. 'Leneth, 3.3 mm. Plate VI) Fig.’ 13. 
Flead, exclusive of the eyes, two-thirds as long as broad, 
eyes very prominent, facets coarse. Frontal fissure deep, 
branching behind the frontal tubercles toward the fovee, 
which are situated on a line passing through the centers of 
the eyes. Occiput convex; below and behind the eyes is 
found a small, horizontal spine. Antenne of the male more 
than one-half the length of the body, first joint cylindrical, as 
long as the frontal margin and not quite half as thick; second, 
one-third as long and two-thirds as- wide as the first, cylin- 
drical; third, fourth and fifth globular, as thick as the second; 
sixth and seventh smaller, also globular; eighth, ninth and 
tenth gradually larger, obconical, the eighth as thick as the 
first, the tenth twice as thick; eleventh thicker and as long as 
the ninth and tenth conjointly, emarginate on one side near 
the base. Pubescence denser on the club. Female antennz 
shorter, less robust, and without the basal emargination on the 
last joint. Prothorax campanulate, widest at middle, as wide 
and long as the head, convex, neck half as long as the base, 
sides rounded at middle, straight towards the neck and base. 
Disk with two slightly impressed fovez on the anterior fourth, 
and an ample one on each side near the base; lateral margin 
depressed, subsulcate by the convexity of the disk. E/ytra 
convex posteriorly, half as long again as the head, breadth at 
the shoulders four-fifths the length of the suture, at the tip 
one-third more than the shoulders. Humeri high, prominent, 
discal lines in the form of a broad, flat-bottomed sulcus, abbre- 
viated at middle, sutural lines parallel, curving outward at the 
base. Addomen broadly margined, first dorsal segment wider 
posteriorly, this and the second carinate, the latter a little 
longer. Ventrals subequal, flattened in the male, meta- 
sternum longitudinally impressed in the middle. Legs very 
long, slender, tibiz slightly increasing in thickness toward the 
