THE PsELAPHID2 OF NORTH AMERICA. 39 
of americanum, differing chiefly in the base of the head, which 
is not channelled or at most scarcely visibly impfessed; the 
prothorax is at least as long as wide, much longer than in 
americanum, with conspicuous lateral fover. lytra about 
the same as in americanum, seemingly not so convex from side 
to side. Length 0.5 mm. 
Habitat. Southern States. 
{ 
Actium, Casey: 
Body more robust than in 7rzmzum, head smaller in pro- 
portion, the shoulders broader. The palpi are short, the last 
joint ovate, acuminate, thick. The elytra have three basal 
punctures and long, well impressed, discal lines; there is a sub- 
humeral fovea in connection with a deeply impressed line on 
the declivous lateral part of the elytra, parallel to the marginal 
impressed line. The marginal line is also a constant mark 
in Zremeune. 
A. PALLIDUM, Casey. Slender, convex, yellow; pubescence 
very fine, recumbent, not conspicuous; body polished, impunc- 
tate. Length 1.2mm. Plate XI, Fig. go. 
Head small, much narrower than the prothorax, as long as 
wide, eyes finely facetted, prominent, large; tempora shorter 
than the eye, not prominent, occiput impressed in the middle; 
there are two pubescent fovez in the eye line, mutually twice 
as distant as either from the eye, connected by a wide, broadly 
arcuate channel. Antenne short, one-half longer than the 
head, first and second joints subequal, larger; third to seventh 
subequal, becoming gradually shorter and more transverse; 
eighth to tenth transverse, equal in length, gradually wider; 
tenth three times as wide as long; eleventh wider, as long as 
the five preceding together, ovoid. Prothorax nearly as wide 
as long at one-third of its length from the neck, where the 
sides are evenly rounded and nearly straight to the basal 
angle; the base is arcuate and thinly margined; disk very 
convex, transverse sulcus deep, one-fourth from the base, 
angulated towards the base in the middle, connecting the large 
