NORTH AMERICAN COLEOPTERA. ISf) 



joints 5-10 transverse; head orbicular, liinil angles nearly smooth ; lliorax rela- 

 tively small, narrower than the head even in the female, form nearly square; sides 

 distinctly sinuate when viewed laterally, disc moderately convex, dorsal punctures 

 rather deeply impressed; elytra wider than the thorax, conjointly nearly square, 

 very shining, sparsely punctate, slightly pubescent; surface with slight bluish 

 lustre; abdomen coarsely and sparsely punctured, less closely on the apical seg- 

 ments, beneath equally coarsely punctured, but the punctures are more regularly 

 placed ; femora and coxoe red, tibite and tarsi piceous, or black. Length .24 — .36 

 inch ; 6 — 9 mm. 



Male. — Anterior tarsi moderately dilated; last ventral with a small, broadly 

 triangular emargination ; head large. 



Fenmh. — Anterior tarsi narrowly dilated; last ventral entire; head not wider 

 than long. 



This species, by its Piederoid style of coloration, can readily be known 

 from all our other species except blaadas, which, however, has undilated 

 front tarsi, and the le<i;s entirely yellow. 



Occurs^ from Canada to Georgia, and as far west as tlie Mi.ssissippi 

 liiver. 



I*, geiitilis n. sp. — Black, shining, elytra metallic blue, coxa;, legs, mouth 

 parts and base of antenuifi yellow; antennie a little longer than head and thorax, 

 piceous, three basal joints pale, joints 5-7 a little longer than wide, 8-10 as wide 

 as long, hea<l orbicular, the hind angles nearly smooth ; thorax oval, as wide as 

 long, very distinctly narrowed in front; sides not at all sinuate, disc moderately 

 convex, dorsal punctures deeply impressed; scutellum black, moderately densely 

 piuurtured ; elytra wider than the thorax, conjointly a little wider than long, 

 rather densely sub-muricately punctured and sparsely pubescent; abdomen above 

 roughly punctured, the punctures sparser on the apical segments ; surface shining, 

 iridescent and sparsely hairy, beneath as coarsely punctured as above, the punc- 

 tures more closely and regularly placed. Length .,34 inch; 8.5 mm. 



3/«/e.— Anterior tarsi moderately dilated ; last ventral segment broadlv trian- 

 gularly emarginale wiiihout gutter. 



i^ewia/<;.— Anterior tarsi narrowly dilated; last ventral simple. 

 In this species the head does not seem to diifer in size in the sexes. 

 The beautiful blueycolor of the elytra has nothinji' resembling it in our 

 fauna exce])t ajauipenni^, which differs by its much larger size and sim- 

 ple male tarsi. 



Occurs in Arizon;i. 



1*. asper n. sp.— Black, moderately shining; elytra distinctly bronzed; legs 

 niceous; anteniise about eiiual in length to the head and thorax, black, basal joints 

 piceous; joints 4-10 distinctly longer than wide; head oval, distinctly narrowed 

 behind the eyes, hind angles smooth, mouth parts piceous; thora.x oval, convex* 

 narrowed in front, not sinuate at the sides, dorsal punctures deeply impressed ; 

 elytra, not wider than the thorax, conjointly nearh' .square, densely sub-muricatelv 

 punctured and sparsely pubescent; abdomen above shining, iridescent, very 

 sparsely, coarsely and rather roughly punctured, beneath shining, iridescent, mar- 

 gins of the segments brownish, very sparsely and coarsely punctured ; legs piceous, 

 the coxpe a little darker. Length .?A inch ; 8.5 mm. 



TUANS. AMi:l!. KNT. SOt,'. X.\. (47) Jt'.NR, 1884. 



