NORTH AMERICAN POLEOPTERA. 



20- 



sent tlio ubdouiinal characters slioukl be increased. On the other liand 

 several species do present unique and very striking characters in the male, 

 these are qiiedmius, pfirinis, clnnnfis and huloitafiis. 



The series is one of difficult study, especially among the smaller species 

 of the five-punctate group. It is possible to separate the males after a 

 little close study, while the females can only be placed after a careful 

 comparison of the minuter details, which cannot be put intelligibly in 

 words 



Dorsal punctures three. 



Thonix transversely oval, nnrrowed in front: elytra bright green or l»lne. 



c.yanipennis. 

 Thorax oval, as long or longer than wide, not or very little narrowed in front. 

 Species bicolored. 



Blue-black, thorax and base of abdomen reddish yellow blaiidllS. 



Pieeous, elytra red, nearlj' smooth qiK'diillus. 



Species entirely black, elytra often fixintly bronzed. 

 Abdomen distinctly punctate. 



Last ventral of male with oval emargination iiordidllS. 



Last ventral of male with triangular emargination cepiialotes. 



Abdomen scarcely punctate; form more slender filicomis. 



Species piceo-testaceous, head black. 



Abdomen beneath sparsely punctured iiiqiiietus. 



Abdomen beneath densely punctured at base Vt'r^iutus. 



Dorsal punctures four. 



Thorax nearly square veiiiralis. 



Thorax longer than wide, j)arallel. 



Elytra as long or longer than the thorax. 



Elytra normally punctured, color pieeous or brown distaiis. 



Elytra nearly smooth at sides and base, color black fallac'i<>SUS. 



Elytra shorter than the thorax brevipeniiis. 



Dorsal punctures five. 



Thorax short, iiearly as wide as long. 



Species larger, black ; elytra regularly punctured Sio^j^waldi. 



Species small, brown ; elytra very sparsely punctured crasiiiuliis. 



Thorax oblong, notably longer than wide. 



Last ventral of male broadly concave and smooth clunaliiii. 



Last venti-al of male emarginate, and with a channel extending the entire 



length of the segment parvus. 



Last ventral of male emarginate, without channel. 



Last ventral of male acutely triangularly emarginate, each side sinuate, the 



apex thus bidentate bidentatus. 



Last ventral of male with a large and broad triangular emargination fim- 

 briate on the inner edge with rather long still' hairs virilis. 



Last ventral of male triangularly emarginate, the entire apex with a semi- 

 membranous border punctatellns. 



Last ventral of male with a broad semi-circular emargination with semi- 

 membranous border microphthaliniis. 



