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Females
1 Color black, the pubescence more or less evidently reflecting deep bluish or purplish; length 13-23; third antennal segment subequal to or a little shorter than the upper interocular distance 2
1’ Color black, the second abdominal tergite marked with orange; pubescence obscurely reflecting deep blue-green; third antennal segment slightly to considerably greater than the upper interocular distance, of the size under 13mm 3
2 Front basitarsus with 3 rather short comb-spines, rarely with a small fourth; emargination of clypeus rather broad; eyes converging but slightly above, upper interocular cistance from .82 to .88 times the lower interocular; post-ocellar line less than the ocello-ocular
Anoplius aethiops Cresson 1865
2’ Front basitarsus with 4 longer comb-spines, rarely with a short fifth; emargination of clypeus more noarrow and sharply-defined; eyes converging more above, upper interocular distance from .72 to .8 times the lower interocular; post-ocellar line subequal to or slightly less than the ocello-ocular Anoplius cleora Banks 1917
3 Front basitarsus usually with 3 comb-spines; upper interocular distance about .75 times the lower interocular; third antennal segment from 1.0 to 1.2 times the upper interocular distance; emargination of clypeus more narrow and sharply defined
Anoplius atrox Dahlbom 1843
3’ Front basitarsus usually with 4 comb-spines; upper interocular distance aobut .65 times the lower interocular; third antennal segment from 1.2 to 1.4 times the upper interocular distance; emargination of clypeus rather broad and shallow
Anoplius bengtssoni Regan 1923
Males
1 Color black, the pubescence more or less strongly strongly reflecting deep bluish or purplish; plumose process of subgenital plate extending less than half the distance from the basal sclerite to the apex of the plate
2
1’ Color black, the second abdominal tergite marked with orange, the pubescence obscurely reflecting deep blue-green; plumose process longer, generally extending more than half way from the basal sclerite to the apex of the subgenital plate
3
2 Post-ocellar line distinctly less than ocello-ocular; eyes converging less above, upper interocular distance about .95 times the lower interocular; front convex, rather full between the eyes; parameres with a distinct subapical curvature
Anoplius aethiops Cresson 1865
2’ Post-ocellar line subequal to ocello-ocular; eyes converging somewhat more above, the upper interocular distance about .9 times the lower interocular; front less convex, rather flat between the eyes; parameres straight
Anoplius cleora Banks 1917
3 Eyes converging slightly above, upper interocular distance from .88 to .95 times lower interocular; post-ocellar line usually a little less than the ocello-ocular, the ocelli of average size; parameres linear
Anoplius atrox Dahlbom 1843
3’ Eyes more strongly convergent at the top, the upper interocular distance from .80 to .88 times the lower interocular; ocelli rather large, the post-ocellar line usually slightly greater than the ocello-ocular; parameres somewhat broadened apically
Anoplius bengtssoni Regan 1923
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