BARK BEETLES OF THE GENUS HYLASTES 19 
than striae, somewhat convex, more strongly so behind and especially on 
declivity, brightly shining, finely rugose and very finely granulate. MDeclivity 
with the striae narrower and deeper; interspaces more strongly convex, each 
with a middle row of small granules, from each of which arises a small, in- 
conspicuous hair; surface masked and rendered opaque by a moderately dense 
covering of moderately narrow, appressed scales. Last abdominal sternite 
longer than preceding two combined, moderately broadly rounded behind; sur- 
face convex, deeply, moderately finely, and closely punctured, with fine, incon- 
spicuous hairs. 
Male—vVery similar to female, differing principally in structure of last ster- 
nite, which is somewhat shorter, more broadly rounded behind, broadly, very 
feebly impressed in median area behind, with slightly longer hairs. 
Type locality—lLas Vegas Hot Springs, N. Mex. 
Additional localities—Pinal Mountains, Ariz.; Gallup, N. Mex. 
Host— Unknown. 
Holotype, allotype, and nine paratypes—U. 8. National Museum 
No. 54035. 
Type, allotype, and seven paratypes bear the data “Las Vegas 
H. S., N. M.; Barber and Schwarz, Coll.”; one paratype, “Gallup, 
N. M., Coll. Wickham”; one paratype, “Pinal Mts., Arizona, Wick- 
ham.” 
Remarks—This species is allied to both gracilis and nitidus. 
It is readily separated from ntidus by its smaller size, finer sculpture, 
and proportionally wider pronotum. From gracilis it is distinguished 
by the more shining surface, the finer pronotal punctures, the nar- 
rower elytral apex, the strongly impressed first elytral striae, and the 
absence of granules on the frons. 
HYLASTES GRACILIS Leconte 
Hylastes gracilis Leconte, 1868, Amer. Ent. Soc. Trans. 2: 174; Leconte, 1876, Amer. 
Phil. Soe. Proe. 15: 388; Hopkins, 1899, W. Va. Agr. Expt. Sta. Bul. 56: 449 (as 
synonym of tenwis Zimm.); Fall and Cockerell, 1907, Amer. Ent. Soc. Trans. 
33: 218; Swaine, 1909, N. Y. State Mus. Bul. 184: 147 (as synonym of tenuwis 
Hich.) ; Swaine, 1918, Canada Dept. Agr. Ent. Branch Bul. 14 (2): 78. 
Female, cotype.—Dark reddish brown, with elytra slightly lighter, 3.91 mm. 
long, about 3.04 times as long as wide. 
Frons moderately broad between eyes; frontal rectangle about 1.1 times as 
long as wide, reddish brown with epistomal margin light piceous; epistoma 
broadly, moderately deeply impressed at each side of the fine, rather faint median 
carina, which extends from epistomal margin to arcuate transverse impression ; 
epistomal margin thickened and liplike, its median lobe moderately broad, short, 
with free end emarginate and anterior face broadly impressed on middle half; 
arcuate transverse impression wide but rather shallow; surface moderately shin- 
ing, finely, very densely punctured, somewhat granulate below; hairs fine, short, 
moderately numerous, not conspicuous. Eye finely granulate, not quite twice 
as long as wide, much wider above; inner margin entire. Antenna with first 
segment about as long aS others combined. 
Pronotum slightly but distinctly narrower than elytra, about 1.19 times as long 
as wide, slightly widest just in front of middle; base feebly arcuate; posterior 
angles rounded; sides nearly straight and subparallel on posterior two-thirds, 
then gently, arcuately narrowed to the moderately rounded front margin; surface 
moderately shining; punctures of moderate size, depth, and spacing, much finer 
and closer in front, densely granulate-punctate at sides; median lines usually nar- 
row, scarcely elevated, often indistinct ; vestiture short, fine, inconspicuous, disk 
often appearing glabrous. 
Elytra distinctly wider than pronotum (45:38), almost exactly twice (2.02) 
as long aS wide; sides nearly Straight and subparallel for about two-thirds of 
their length, then arcuately narrowed, with extreme apex rather broadly rounded ; 
surface rather weakly shining; striae moderately impressed, with the first but 
