. Brigham Young University science bulletin. Biology -- Periodicals. 12 VOUNG UNIVERSITV SCIENCE BULLETIN. Fig. 1. Scolytus nodalus abdomen and elytra: male at upper left and below: female at upper right. both sexes, it is devoid of tubercles in both sexes. Male.—Length mm. (paralypes mm.). times as long as wide; color dark brown, anterior margin of thorax, bases and apices of elytra may be reddish. Frons weakly convex; surface coarsely, somewhat con- vergently strigose toward the shallowly, broadly emar- ginate epistomal margin: punctures not evident: vestiture consis
. Brigham Young University science bulletin. Biology -- Periodicals. 12 VOUNG UNIVERSITV SCIENCE BULLETIN. Fig. 1. Scolytus nodalus abdomen and elytra: male at upper left and below: female at upper right. both sexes, it is devoid of tubercles in both sexes. Male.—Length mm. (paralypes mm.). times as long as wide; color dark brown, anterior margin of thorax, bases and apices of elytra may be reddish. Frons weakly convex; surface coarsely, somewhat con- vergently strigose toward the shallowly, broadly emar- ginate epistomal margin: punctures not evident: vestiture consisting of fine, rather long, moderately abundant hair. Eye emarginale; very finely granulate. Antennal club times as long as wide; sutures not evident, very finely, closely pubescent. Pionotum equal in length and width; widest at base, the sides moderately arcuate and converging to dis- tinct constriction just behind broadly rounded anterior margin; surface smooth, brightly shining, the pinictures rather small, deep. oval, larger in lateral and anterior areas; glabrous on disc, sparse hair at sides and in front. Elytra times as long as wide, times as long as pronotum; sides straight and parallel on basal half, con- verging slightly behinil to the broadly rounded postero- lateral angles, almost straight on median half; posterior margin smooth, striae and interstriae moderately im- pressed, the punctures small, rather deep, those of striae very slightly larger; elytra descending very slightly near posterior margin; vestiture confined /to scutellar impres- sion. Sternum 2 ascending sharply, the margin not pro- duced, armed by a laterally compressed, median spine, its base extending from anterior margin to middle of segment, longitudinal length of base and height of spine about equal; sternum 4 armed by a large, rounded tubercle, 2 and 3 each armed at lateral margins by a pair of small teeth; surface finely, obscurely pinictined, dull except anterior half of 2 shining;
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