246 Memoirs on the Coleoptera 



usual position. Length 3.7—5.0 mm.; width 1.7-2.3 mm. New 

 York (Lake Champlain), Lake Superior (Marquette), New Jersey, 

 Pennsylvania and Kansas viridis Say 



Form slightly narrower than in viridis, shining, obscure blue, the head 

 and prothorax sometimes slightly aeneous; under surface and 

 femora very dark blue and shining; head relatively smaller, with 

 more moderate and less prominent eyes, much narrower than the 

 prothorax, feebly rugulose and minutely punctulate, smooth medi- 

 ally; antennae slender, half as long as the body; prothorax very 

 short, fully twice as wide as long, the sides broadly rounded and 

 converging anteriad, feebly converging and nearly straight in about 

 •basal half, the angles sharply marked though scarcely prominent; 

 rugulosity confusedly strigilliform, very fine, rather close-set, the 

 median stria fine, feebly impressed, not entire; anterior impression 

 traceable but very close to the margin; elytra relatively longer than 

 in viridis, two-fifths longer than wide, barely more than twice as 

 wide as the prothorax, moderately inflated posteriorly; striae very 

 fine and shallow, not punctulate, the intervals flat. Length 4.0- 

 4.85 mm.; width 1.9-2.2 mm. Arizona (Tugson), — Tucker. 



planifera n. sp. 



Form still narrower, smaller in size, polished, deep cobalt-blue, the 

 anterior parts more greenish, the pronotum at each side discally, 

 and also the elytra, with some violaceous lustre; under surface and 

 femora shining, rather dark but vivid bluish-metallic; head narrow, 

 distinctly elongate, evidently narrower than the prothorax, the eyes 

 moderate in size and convexity; surface smooth, the lateral punc- 

 tules and rugulosity scarcely at all visible; antennae slender, fully 

 half as long as the body; prothorax rather small, four-fifths wider 

 than long, the sides broadly arcuate and moderately converging 

 anteriad, very slightly converging and straight posteriad, the angles 

 slightly prominent at tip; latero-basal deplanation with a small 

 tubercle near the angle; median stria fine but impressed; rugulosity 

 very feeble and not close-set; elytra a third longer than wide, 

 feebly, arcuately inflated posteriorly, distinctly more than twice as 

 wide as the prothorax; striae fine, just visibly impressed, the in- 

 tervals virtually flat; dorsal punctures distinct, near basal and 

 apical third. Length 4.5 mm.; width 1.55 mm. Mexico (Colonia 

 Garcia, Sierra Madre Mts., Chihuahua), — Townsend. 



*cobaltina n. sp. 



16 — Body rather elongate, moderately convex, shining, pale and bright 

 green throughout above, the under surface black, with greenish 

 lustre; head moderate, with rather large and moderately prominent 

 eyes, about as wide as the prothorax, nearly smooth, the rugulosity 

 laterad very fine and feeble; antennae slender, somewhat more 

 than half as long as the body; prothorax small, two-thirds wider 

 than long, parallel, with somewhat feebly arcuate sides, becoming 

 slightly sinuate near the hind angles, the margins well reflexed; 

 rugulosity fine and feeble; median stria distinct and impressed, 

 finer and obsolescent apically; elytra long, fully two-fifths longer 

 than wide, gradually slightly inflated posteriorly, much more than 



