NEW SPECIES OF BARK BEETLES—BLACKMAN 221 
nearly straight and subparallel on posterior half, then slightly nar- 
rowed, very feebly constricted in front of middle, very broadly 
rounded in front, with margin armed with 8 to 10 low, rather broad 
serrations; summit rather low, surface not strongly impressed behind 
it; anterior area with broad, low asperities, in rather irregular con- 
centric rows; posterior area rather feebly shining, punctures small, 
not deep, with interstices reticulate; median line rather narrow, in- 
definite, not elevated, often slightly impressed. 
Elytra slightly wider than pronotum and 1.68 times as long, 1.88 
times as long as wide; sides straight and subparallel on anterior 
three-fourths, then arcuately narrowed to suture, which is extended 
to form an acumination; surface moderately shining; strial punctures 
of moderate size, not deep, in nearly regular rows, only the first strial 
row impressed; interspaces narrow, surface reticulate, rugulose, im- 
punctate except near base and declivity, subglabrous except at sides. 
Declivity with suture slightly widened, distinctly elevated, with a 
few small, distinct granules and a few short, erect hairs; first and 
second striae with punctures obsolete, with intervening second inter- 
space forming a rather narrow, moderately deep sulcus at each side, 
impunctate and feebly shining; lateral convexity slightly higher than 
suture, with a row of small granules in third interspace and a few lat- 
eral to third interspace; all declivity except sulci with moderately 
numerous, fine, erect, moderately long hairs. 
Male.—Stouter than female, about 2.7 times as long as wide; frons 
convex above, transversely flattened below, surface shining, moder- 
ately finely and closely punctured; sculpture of pronotum and elytra 
slightly coarser than in female. 
Type locality—Jalisco, Mexico. 
Host—Sambucus sp. 
Type material—Holotype, allotype, and 65 paratypes, U.S.N.M. No. 
55994. 
The holotype, allotype, and 65 paratypes were taken at quarantine 
from the bark of Sambucus sp. and from bark of unknown crate wood, 
in shipments from Mexico. 
PITYOPHTHORUS DIMIDIATUS, new species 
Female.—Reddish brown, very small; holotype 1.22 mm. long, about 
2.82 times as long as wide, elytra acuminate at apex. 
Frons flattened on an approximate circle, occupying about three- 
fourths of distance between eyes, without an indented margin, very 
finely and densely punctured and densely clothed with very fine, mod- 
erately short hairs, not longer at periphery; with a distinct carinal 
tubercle in median line of epistoma. Eye finely faceted, less than half 
divided by a V-shaped emargination. Antennal club moderately broad 
