NEW SPECIES OF BARK BEETLES—BLACKMAN 209 
The female is unknown. 
Type locality —Guadalajara, Jalisco, Mexico. 
Host—Sambucus sp. 
Type material—Holotype, U.S.N.M. No. 55983. 
The holotype was intercepted at the port of New York in a shipment 
from Guadalajara, Jalisco, Mexico, in the wood of Sambucus sp. 
PITYOPHTHORUS ALNI, new species 
. Pate 23, Fiaures 39, 40 
Female—Black, subopaque to feebly shining; 1.83-2.47 mm. long; 
holotype 2.47 mm. long, 2.85 times as long as wide. 
Frons convex, somewhat fiattened below, very wide between eyes, 
frontal rectangle about 0.50 as long as wide; surface rather weakly 
shining, finely, roughly punctured, subgranulate above and at sides, 
punctures nearly lacking on median third just above epistoma; with 
a rather variable median carina; vestiture consisting of cinereous hairs, 
short and fine at sides and above, longer and coarser in area at sides 
and above median impunctate area. Eye small, with moderate facets, 
more than half divided by a rather wide emargination. Antenna (fig. 
39) testaceous, club large, about 1.5 times as long as funicle, widest 
through third segment, first two sutures feebly arcuate-septate, third 
more strongly arcuate and devoid of septum. 
Pronotum about 1.19 times as long as wide, widest behind; posterior 
border margined, feebly arcuate; sides nearly evenly arcuate from 
base to moderately broadly rounded front margin, the constriction 
scarcely indicated; contour of disk as seen from side nearly evenly 
convex, without distinct transverse impression behind summit; an- 
terior margin scarcely serrate; disk subopaque to moderately shining; 
summit slightly behind middle, surrounded by dense, slightly irregu- 
lar, concentric lines of low, wide asperities, which at sides gradually 
become lower, but extend backward nearly to posterior margin; 
disk behind summit deeply, rather roughly punctured; median line: 
punctured across base, but impunctate on a narrow, scarcely elevated 
area from near base to summit; vestiture rather short and fine on 
asperate surface, posterior disk nearly glabrous. 
Elytra slightly wider than pronotum, about 1.81 times as long as. 
wide, slightly widest behind middle, sides subparallel on anterior two- 
thirds, narrowly rounded behind; surface black, feebly to moderately 
shining; striae distinctly impressed, deeply, closely, rather finely punc- 
tured; interspaces wider than striae, convex, impunctate or nearly so 
on anterior half of disk, finely, sparsely punctured behind, with a few 
short, fine, cinereous hairs. Declivity sloping, not sulcate, with suture: 
slightly elevated; first striae strongly, the others more weakly im- 
pressed, strial punctures much smaller than on disk and sides, inter- 
