1943] Genus Pleuropompha 31 
AA. Each elytron with three strong costae, raised suture and 
margin not set off by denuded margins. Pubescence pale 
olive-cinereous tricostata sp. nov. 
Pleuropompha costata (LeConte) 
Lytta costata LeConte, 1854, Proc. Acad. Nat. Sci. Phila. 7:84; 
1858, Journ. Acad. Nat. Sci. Phila. (2)4: 23, ( S ). 
Pleuropompha costata , LeConte, 1862, Smiths. Misc. Coll. 
3:273. 
Black (or dark brown), densely clothed above with flattened 
white hairs and below with ordinary white pubescence. Elytra 
with four strong costae, two arising from the base and two from 
the humerus, the latter two not reaching the base. All the 
costae united posteriorly. These costae and the raised suture 
and margin densely pubescent, sharply set off by denuded mar- 
gins. The elytral intervals with sparser pubescence, so that they 
appear grey. Narrow; about four times as long as broad. Ten 
to eighteen mm. long but usually about sixteen. 
Head subquadrate; eyes prominent, small, transverse, quite 
narrow and excavated near the antennae and mandibles. 
Median impressed line deep, and conspicuous because of very 
narrow denuded areas bounding it. The rest of the head, includ- 
ing the antennal calluses, densely pubescent, with flattened 
hairs. Clypeus also densely pubescent, but with normal hairs. 
Labrum slightly emarginate, sparsely pubescent. Antennae 
black. Male: about three times as long as an anterior tibia, 
reaching to the basal third of the elytra. First joint normal, 
rather slender, reaching two-thirds across the eye; second and 
following slender, slightly flattened and loosely articulated. 
Second joint a little shorter than the first; third to fifth sub- 
equal, about two-thirds longer than the second, shiny; sixth to 
eleventh subequal, short, altogether equal to the fourth and 
fifth together. Female: first joint reaching to the middle of the 
eye; second two-thirds the first; third to fifth about equal to 
the first, normal; sixth to last short, together equal to the 
second to fifth. Pronotum elongate-campanulate, two-thirds 
longer than broad. Median impressed line as on the head, 
bounded by a pair of feeble longitudinal ridges. There is often 
a pair of small denuded spots on the disc just behind the middle. 
Legs dark brown. Pubescence white, black on tips of tibiae and 
