Platynin^ 83 



2 — Form rather less elongate than in nutans and smaller in size, black, 

 shining, rather uniform and bright green throughout above; under 

 surface piceous-black, the entire legs testaceous; head slightly 

 elongate, larger, three-fourths as wide as the prothorax, the eyes not 

 very prominent, the impressions diverging posteriad; antennae 

 slender, blackish, with pale basal joint, more than half as long as 

 the body, the third and fourth joints equal; prothorax not quite 

 as long as wide, widest before the middle, the sides subevenly 

 rounded throughout, finely reflexed, more so at the obtuse and 

 rounded basal angles; base just visibly narrower than the apex, 

 which is moderately sinuate; surface with more or less evident 

 transverse rugul^e, the transverse impressions evident to sub- 

 obsolete; foveas deep, traceable almost to the middle, somewhat 

 rugose; elytra slightly more than one-half longer than wide, one- 

 half to two-thirds wider than the prothorax, the outline nearly as 

 in nutans, the sinus rather rapidly oblique and feeble though evi- 

 dent; striae grooved and feebly impressed, coarser than in nutans, 

 completely impunctate, the scutellar not so long; intervals not 

 quite flat; dorsal punctures three; tarsi slender, the anterior of the 

 male narrowly dilated. Length (cf 9) 7.2-7.4 mm.; width 2.6- 



2.75 mm. Illinois. Four examples concretum n. sp. 



A — Nearly similar to the female of concretum but stouter and a little 

 larger, the upper surface not brassy-green but pure bright steel- 

 blue throughout, polished; under surface black, the legs fer- 

 ruginous; antennae distinctly longer and more slender, similar in' 

 coloration; prothorax as long as wide, nearly as in concretum but 

 with the transverse rugulae much less evident, the feebly punctulate 

 foveae traceable to the middle, the strongly reflexed basal part of 

 the sides similar; elytra similar but broader, the three punctures 

 very fine. Length (9) 7.5 mm.; width 2.8 mm. Northern 



Illinois amicxun n. subsp. 



Form nearly as in concretum but a little larger, more elongate and with 

 more evenly elongate-oval and convex elytra, shining, viridate 

 anteriorly, the elytra blacker and without distinct metallic lustre; 

 under surface black, the epipleura piceous, the legs obscure flavo- 

 testaceous, with slightly darker tarsi; head elongate, three-fourths 

 as wide as the prothorax, the eyes well developed but scarcely at 

 all prominent; antennae slender, blackish, with pale basal joint, 

 the third just visibly shorter than the fourth; prothorax not quite 

 as long as wide, the sides very evenly rounded from apex to base 

 but more converging basally, finely refle.xed, more so and forming 

 the outer wall of the foveae at base, which is just visibly narrower 

 than the apex; impressions subobsolete; foveae deeply concave, 

 finely punctulate, traceable in about basal two-fifths; elytra evenly 

 oblong-oval, three-fifths longer than wide, two-thirds wider than 

 the prothorax, the sides very evenly arcuate, gradually a little more 

 so basally to the distinct angle between the sides and sinuate basal 

 margin; apex very gradually rounded, the sinus feeble; striae not 

 fine, deep, finely' and obscurely punctulate, the scutellar long, fine, 

 punctulate, the intervals very sensibly convex; met-epistera one- 



