A REVISION OF NORTH AMERICAN CHRYSOBOTHRINI 147 



Male. — Moderately elongate, strongly depressed above, subopaque, piceous, with 

 a faint bronzy or cupreous reflection, especially in the depressions; beneath 

 purplish brown, and more strongly shining than above. 



Head brownish cupreous, with two small, smooth callosities on front, and a 

 narrow, smooth, longitudinal carina on occiput ; front flat ; surface coarsely, deeply 

 fossulate-punctate, longitudinally rugose on vertex, sparsely clothed with moder- 

 ately long, semierect, white hairs ; clypeus broadly, deeply, triangularly emargi- 

 nate in front, arcuately rounded on each side. Antenna slightly narrowed to 

 apex, bronzy green, with segments 4 to 11 in greater part brownish yellow ; inter- 

 mediate segments subtriangular, not compact, slightly longer than wide, subtrun- 

 cate at outer margins; third segment nearly as long as following two segments 

 united. 



Pronotum nearly twice as wide as long, slightly narrower at apex than at base, 

 widest at apical third; sides sinuate and slightly converging from apical third 

 to posterior angles, arcuately converging at apical angles ; anterior margin broadly, 

 arcuately emarginate, without a median lobe ; base broadly, arcuately emarginate 

 on each side, median lobe slightly produced and broadly rounded; disk slightly 

 convex, with a broad, rather deep, median sulcus, which is wider in front, and 

 limited on each side by a broad, smooth, elevated space, between which and the 

 lateral margin the suiface is very uneven, and with a narrow, acute carina on 

 each side near posterior angle ; surface densely, confidently punctate in depres- 

 sions, punctures coarser at sides, and sparsely clothed with sbort, inconspicuous 

 hairs. 



Elytra distinctly wider than pronotum, twice as long as wide; sides nearly 

 parallel from humeral angles to apical third (slightly constricted at apical third), 

 then arcuately converging to tips, which are separately broadly rounded ; lateral 

 margins coarsely serrate ; basal depressions broad and deep ; humeral depres- 

 sions broad and shallow; surface glabrous, uneven, finely, densely, irregularly 

 punctate between costae. Each elytron with first costa sinuate, rather distinct on 

 apical half, becoming more or less obsolete basally, the other costae replaced by 

 broad, smooth spaces of irregular shape, and with 'a vague, irregular, ti ansversely 

 oblique fovea behind middle. 



Abdomen beneath rather finely, sparsely, irregularly punctate, slightly rugose 

 at sides of basal sternites, sparsely clothed with short, recumbent, inconspicuous 

 hairs, without distinct lateral callosities, intervals indistinctly granulose ; last 

 visible sternite broadly, deeply, arcuately emarginate at apex, without a sub- 

 marginal ridge, lateral margins serrate; eighth tergite coarsely, sparsely punc- 

 tate, densely granulose, rather deeply, triangularly emarginate at apex, but not 

 longitudinally carinate. Prosternum coarsely, densely punctate, smooth at middle, 

 rugose along anterior margin, sparsely clothed with long, recumbent, white hairs ; 

 anterior margin slightly arcuate, without a distinct median lobe. Anterior femur 

 with a large, obtusely triangular tooth, which is dentate on outer margin. Ante- 

 rior and middle tibiae arcuate, and slightly dilated at apices; posterior tibia 

 straight. 



Length 16 mm., width 6 mm. 



Redescribed from a male in the United States National Museum, 

 collected at North Saugus, Mass., by F. H. Mosher. 



Female. — Differing from the male in having the last visible sternite more 

 elongate, and deeply, narrowly emarginate at apex, the eighth tergite coarsely, 

 confluently punctured, and slightly emarginate at apex, and the anterior and 

 middle tibiae not distinctly dilated at their apices. 



Type locality. — Of dentipes, "America Boreali" ; present location of 

 type unknown to writer, but part of the Coleoptera collection of 

 Germar is in the Zoological Museum at Berlin, and part in the Deutsche 

 Entomologische Institut at Dahlem, Germany. Of posticalis, planata, 

 and plicata, "Amerique Boreale"; of rotundicollis , Santo Domingo; 

 present location of these types unknown to the writer. Of ruftcornis, 

 "Amerique BoreaJe"; type in Munich Museum. Of characteristics, 

 probably Massachusetts ; type in the collection of the Boston Society 

 of Natural History. 



Distribution. — This is one of the most widely distributed species of 

 Chrysobothris in North America. Specimens have been examined 



