60 BULLETIN 63,. UNITED STATES NATIONAL MUSEUM. 



Legs rather slender and moderate in length ; anterior femora mutic 

 in the sexes; anterior tibial spurs dissimilar; anterior tarsi feebly 

 dissimilar in the sexes, first joint slightly thickened at tip beneath. 



Male. — Elongate, eh^tra rather gradually narrowed posteriorly, 

 quite e\enly and arcuateh' declivous behind. Abdomen moderately 

 oblique, not strongl}^ convex, more or less feebly impressed at middle 

 on first two segments ; intercoxal process somewhat concave. Anterior 

 sj)urs of the anterior tibiae about twice as loug as the posterior, 

 slightly curved, just feebly widened and gradually narrowed from 

 base to apex, the latter acute. First joint of the anterior tarsi with 

 the minute tuft of modified spinules scarcely evident, ordinary 

 spinules present on the thickened tip beneath. 



Female. — Robust. Elytra somewhat broadly oval, and slightly 

 narrowed posteriorly, usually arcuately and rather vertically decli- 

 vous behind ; abdomen horizontal and strongly convex. Anterior 

 spurs of the anterior tibiiie usuall}^ about a third to a half longer than 

 the posterior, moderately curved and rather gradually narrowed from 

 base to apex, noticeably widened. First joint of the anterior tarsi 

 with ordinary spinules on the thickened tip beneath. 



Four forms may be recognized : 



Forma glabra. — Elytra estriate and more or less smoothly sculp- 

 tured. 



Forma typica. — P]lytra striato-punctate, intervals slightly convex, 

 subasperate. 



Forma annectans. — Elj'tra rather strongly striato-punctate, inter- 

 vals strongly convex ; sculpturing subasperate. ■ * 



Forma punctata. — P^lytra estriate, irregularly and moi-e or less 

 nmricately punctate. 



Measurements. — Male: Length, 12.5-10 mm., width, 5-T mm. Fe- 

 male: Length, 14.5-18 mm.; width, G.5-7.5 mm. 



Genital chanieters.i male. — Edea<^ophore (Plate 3, fig. 1) flax-seed- 

 shaped (flattened oblong-ovate), scarcely arched. 



Basale oblong-oval, glabrous, moderately convex ; sides more or 

 less feebly arcuate. 



Apicale slightly elongate aiul triangiilai"; surface in basal moiety 

 evenly convex, in ai)ical half a mediaji longitudinal membranous 

 groove; sides moderately arcuate in basal half, sinuate at middle, 

 hence feebly or scarcely ai'cuate to a])ex. the latter acute but not 

 acuminate; base broadly lobed at middle two-fourths, broadly and 

 feebly sinuate laterally. 



Sternite (Plate 3, fig. 2) parabolic in outline. Each lobe with the 

 external border more or less evenly arcuate from base to apex, fre- 

 quently slightly sijiuate in basal half; apex evenly roimded, angle 

 usually not evident; internal border more or less obliipie and feebly 

 sinuous; surface I'ather sparsely ])unctate in aj)ical moiety, setose, 



