THE PsELAPHIDA OF NorTH AMERICA. 51 
mental width; fourth dorsal not prolonged. The first and 
second ventrals longer, the second half as long as the first. ¢ 
anterior thighs strongly clavate, last ventral transversely im- 
pressed, otherwise like the 9. 
Habitat. Cedar Rapids, Ia. One pair sifted from rotten 
wood in September. 
T. arcuatus, Lec. Yellowish brown, highly polished, 
impunctate; legs and antenne pale; pubesence inconspicuous. 
Length 1.2 mm. 
Head slightly wider than long, tempora parallel, angles 
rounded, eyes small; vertex impunctate, with two small pubes- 
cent foveee between the eyes, mutually twice as distant as 
either from the eye; sulcus feeble, wider and somewhat deeper 
behind the frontal ridge; supra-antennal tubercles obliquely 
oblong crossed by a short impressed line; labrum emarginate 
anteriorly, with a transverse row of sete. Antenne one-half 
longer than the head, funicle moniliform, ninth and tenth joints 
gradually wider, transverse, eleventh as long as the four pre- 
ceding together, one-half longer thar wide, conical, acuminate. 
The last joint of the maxillary palpi is fusiform, twice as long 
as thick. Prothorax widest across the middle, as wide as the 
head and imperceptibly longer, sides evenly and strongly 
arcuate anteriorly, and very slightly sinuate toward the base; 
the neck is nearly as wide as the base; disk very convex, 
basal foveze one-fourth from the base, nude, the middle one 
punctiform, the lateral ones large, connected by an arcuate 
line. iytra slightly wider across the shoulders than the 
pronotum, length one-third greater than the width of the 
shoulders; sides strongly arcuate; disk convex, sutural lines 
arcuate, discal lines deep, one-third of the elytral length. 
Abdomen convex, wider across the third segment than at the 
base, the first segment longer; no carina. Legs long, tarsi 
slender, the second joint twice as long as the last. The under 
surface of the head, behind the mentum, is hairy, each hair 
ending ina small globule. The metasternum has a deep 
fovea near the middle. 4, intermediate femora thicker. 
Habitat. Middle and Southern States. 
