206 PROCEEDINGS OF THE NATIONAL MUSEUM you, 92 
The holotype was taken from Pinus leiophylla at Chalco. Mexico, 
by Donald DeLeon, January 27, 1936. No other specimen has been 
seen. 
PITYOPHTHORUS REGULARIS, new species 
PLATE 22, FIGURE 33 
Female-—Light reddish brown (somewhat immature); 1.87 mm. 
long, 2.52 times as long as wide, allied to rhois Swaine. 
Frons brightly shining, convex above, with small, rather close punc- 
tures, imperfectly flattened below on an approximate semicircle, with 
punctures fine around periphery, obsolescent toward center, with only 
a few very fine, inconspicuous hairs; median carina represented by a 
small tubercle on epistomal margin. Eye rather small, with moderate 
facets, nearly half divided by emargination. Antenna (fig. 33) with 
club 1.20 times as long as wide, 1.55 times as long as funicle, widest 
through third segment, with septa of first two sutures incomplete, 
nearly transverse. 
Pronotum 1.02 times as long as wide, widest near base, posterior 
outline nearly straight, ee wenn angles rounded; sides 
weakly arcuate on posterior half, then more strongly, convergently 
arcuate to the constriction, narrowly rounded in front, with anterior 
margin extended and distinctly serrate; anterior area with asperities 
fused to form 5 (including marginal serrations) perfectly regular, 
concentric lines, with a row of fine, dorsally directed hairs from each; 
summit high, at about middle, with a wide, transverse impression be- 
hind it; posterior area with surface shining, distinctly reticulate; punc- 
tures moderate in size, depth, and spacing; median line broad, 
impunctate, not elevated ; vestiture very scanty, consisting of very fine, 
short hairs. 
Elytra as wide as pronotum, 1.49 times as long as wide, 1.48 times 
as long as pronotum; sides subparallel on anterior two-thirds, mod- 
erately rounded behind; surface brightly shining, strial rows regular, 
with punctures deep, close, and moderately coarse, only first stria 
impressed ; interspaces flat, somewhat rugulose, impunctate anteriorly, 
with a few punctures on posterior third of disk and sides Declivity 
moderately steep; suture elevated, with very fine granules; first stria 
strongly impressed, with punctures reduced, second stria feebly im- 
pressed, lateral elevations scarcely higher than suture; all of interspaces 
punctured and with numerous rather short, erect, yellowish hairs. 
Male.—Similar to female but slightly stouter and with apex of elytra 
more broadly rounded; frons convex, transversely impressed below; 
punctures sparser, deeper, more uniformly distributed; median carina 
faint. 
