June X9CO.] CaSEY : On NoRTH AMERICAN COLEOPTERA. 93 



sexes, the sutures transverse, perfectly free and virtually straight 

 throughout. The elytra have sometimes-as in plemis—^. smooth 

 callous discal spot near the apex of each, which may be homologous 

 with the smooth polished mirror-like sexual spots of the melynd genus 

 Eurelxmis. Sexual differences in the form of the body are occasion- 

 ally very pronounced, the male being shorter and stouter than the 

 female, with relatively broader prothorax and shorter elytra. 



The species before me may be tentatively characterized in the fol- 

 lowing manner : — 

 Lateral spicule of the prothorax situated at or near the middle of the length ; front 



not constricted between the antennae ; species general in d.stribuUon ^ 



Lateral spicule situated far behind the middle, the sides just posterior to them fre- 

 quently arcuately prominent ; front narrowed by the very large antennal foveae^ 



Pacific coast ' • . ii„ 



2-Sidesof the prothorax broadly and conspicuously angulate at about the middle, 

 the spicule at the apex thereby rendered more prominent and separated from the 

 truncature of the anterior angles by a pronounced sinus 3 



Sides of the prothorax in the form of a continuous and generally evenly arcuate curve, 

 ■from the truncature of the apical angles to the base, the submedian spicule ab- 

 ruptly projecting from the limb and frequently extremely small ....•••IS 



3_Eyes large, generally one-half as long as thehead or more ; elytrafinely and rather 

 closely punctured V'Vr' i "fV.^ 



Eyes smaller but more strongly convex, always much less than one-half as long as the 



4_^^,'desof'\heAorad7angiervery prominent and posteriorly unciform, the pro- 

 thorax much wider anteriorly than at the middle, rather finely but deeply, 

 densely punctate, the discal callous spots obsolete ; elytra elongate, between three 

 and four times as long as the prothorax. Length I.9-2.5 mm. ; width 0.75-0.9 



mm Europe, Siberia and Northern America acutangulus G>'//. 



Nodes moderate in development, acute but not unciform posteriorly, the prothorax 



equally wide anteriorly and at the middle • -V^ 



5_Pubescence long, coarse and very conspicuous, the serial hairs of the elytra dis- 

 tinct • elytra distinctly more than three times as long as the prothorax. Length 

 2 2-2 S mm ; width 0.9-1.0 mm. Europe and Northern America. ^ 



^ cellans Scop. 



Pubescence short and more decumbent, less coarse and very much less conspicuous, 

 the serial hairs subob.solete ; pronotum finely but deeply, only moderately densely 

 punctate, the callous spots feeble ; elytra more oval and less elongate, about three 

 times as long as the prothorax. Length 1. 9-2.1 mm. ; width 0.8-0.85 mm. 



....debilis Lee. 



California , 



6-Elytral punctures fine, the pubescence very short, inconspicuous and decumbent, 

 the subserial hairs subobsolete or very short, the pronotal callous spots obsolete 

 or scarcely traceable ; nodes of the thoracic angles sharply truncated, the pro- 

 thorax as wide at the middle as at the apex 7 



