THE PsELAPHID2 OF NorTH AMERICA. 47 
eighth equal, transverse, seventh, eighth and ninth gradually 
wider; ninth as wide as the second, and twice as wide as the 
third; tenth of the same form larger both ways; eleventh coni- 
cal-ovate, slightly wider and truncate at the base, as long as 
the two preceding ones. /Pyvothorax widest on the anterior 
third, as wide as the head, anterior, edge broadly arcuate, 
transverse, base not quite three times wider than the neck; 
sides, with the base, forming a broad arch, nearly semicircular; 
the sides bear three recurved spines, the disk is depressed- 
convex, with a linear median sulcus crossing a transverse 
linear one, which ends at the sides in a longitudinal arcuate 
depression, with a small round fovea. lytra as wide across 
the high, spinous, prominent shoulders as the suture is long; in 
the middle they are slightly broader, sides slightly arcuate, 
depressed, impunctate, disk narrowly elevated; sutural lines 
straight, well impressed, discal lines deep at the basal fovea, 
evanescent before the middle; from the humeral spine to the 
tip, near the lateral margin, is a sub-marginal sharp ridge. 
Abdomen strongly margined, convex, tumid in the middle, first 
segment depressed at the base with two short caring one- 
fourth of the total width apart. Legs rather short. @ second 
tarsal joint dilated, the ventral segments longitudinally con- 
cave, the last ventral transverse; at the tip is a deep funnel- 
shaped fovea situated in a lunately depressed area. 
Habitat. East of the Mississippi River from north to 
south. 
R. supstTriAtTus, Lec. Brown, less convex than A. 7n- 
sculptus. 
flead of the same form and sculpture as in the preceding 
species. Prothorax with a longitudinal linear sulcus and three 
large impressions near the base. /ytra with the basal mar- 
gin elevated (as in Ft. zusculptus), basal fovea deep, each 
elytron with four faint striz, of which the sub-sutural one is 
longer and more distinct, the others extending only about to 
the middle. Antenne with the ninth and tenth joints less sud- 
denly larger than in A. zuscu/ptus. Length 1.2 mm. 
Habitat. Florida. 
