NEW AMERICAN SCOLYTOID BEETLES — BLACKIMAN 379 



rounded ; sides with sharply elevated, beaded margin ; lateral outline 

 strongly arcuate, considerably narrowed in front of middle, very 

 broadly rounded in front ; surface feebly shining, reticula elongated, 

 punctures deep, rather line, moderately close ; glabrous. 



Elytra scarcely wider than pronotum and 1.24 times as long, 1.14 

 times as long as wide ; bases nearly straight, sides subparallel on an- 

 terior two-fifths, then semicircularly rounded, leaving the last two 

 tergites exposed; surface moderately shining, strongly sculptured; 

 dorsal contour arcuate from base to apex; striae strongly impressed, 

 punctures moderately small, separated by their own diameters on an- 

 terior half, very fine and indistinct behind; interspaces wider than 

 striae anteriorly, narrower than striae posteriorly, convex, granulate, 

 distinctly punctured anteriorly, punctures less distinct posteriorly; 

 vestiture entirely lacking, except at extreme side's. 



Type locality. — San Borja, Beni, Bolivia. 



Host. — ^Unknown. 



Type material. — Holotype and 1 paratype, U. S. N. M. No. 56557. 



The type series was collected in August 1925 by G. L. Harrington. 



CAMPTOCERUS QUADRIDENS, new species 



Plate 16, Figures 14-17 



Male. — Dark reddish brown ; 3.6 mm. long, 1.96 times as long as wide. 



Frons (fig. 15) concave from eye to eye, with frontal rectangle 1.13 

 times as long as wide ; surface subshining, finely, rather closely punc- 

 tured, with moderate, yellow hairs directed dorsomesad; epistoma 

 separated above by a Ioav, short, transverse carina in median third 

 between bases of antennae, surface shining, median third apparently 

 devoid of punctures, sides finely, closely punctate, with fine hairs, 

 epistomal margin transverse, with short, downwardly directed hairs. 

 Antenna (fig. 16) with scape longer than club or funicle, flattened, 

 club-shaped, with rather long hairs, funicle 7-segmented, segments 

 progressively widened distally, with joints 2-7 bearing long, stout 

 hairs the end of many of which extend beyond the rather small 

 club, which has indistinct sutures, only the first one having a partial 

 septum. 



Pronotum 1.18 times as wide as long, posterior outline bisinuate, 

 with a strong, beaded margin, posterior lateral angles scarcely round- 

 ed; sides with a sharply elevated, beaded margin, lateral outlines 

 nearly straight and subparallel on more th;in posterior half, then 

 abruptly narrowed, broadly rounded in front; surface moderately 

 shining, faintly reticulate, with fine, moderately spaced punctures, 

 closer in front; vestiture apparentl}^ lacking on disk, with a few mod- 

 erate hairs on anterior fourth. 



546425—43 2 



