NORTH AMERICAN COLEOPTERA. 181 



8. — Thorax longer than wide. 



Head oval, not conspicuously large. 



Elytra piceous with aeneous surface ; hasal joint of antcnnw i)iceous ahove 



pale beneath politas. 



Elj'tra reddish, abdomen coarsely very sparseh' i)unctate...«eniirul»er. 

 Elytra piceous to testaceous, abdomen moderately closelj- punctate : sjiecies 



very small iK'paticus. 



Head large in both sexes, elytra brown with paler side margin and a])ex, 



abdomen moderately closely punctate '. caiiliiM. 



Tliorax as wide, or wider than long; thorax and elytra reddish busalis. 



Of tlie species in the above table acneus is nearly cosmopolitan, 

 afrafiis, poUtns and KinhrdtiUx occur also in Europe ; the others are 

 peculiar to our fauna as far as we know. The species are arranged in 

 the following pages according to their superficial resemblances : 



P. aeiieu!« Eossi. — Black, elytra often aeneous, sparsely pubescent; antennse 

 piceous, not longer than the head and thorax, joints 5-10 broader than long; head 

 often slightly aeneous, broadly quadrate, a few fine punctures at the hind angles ; 

 thorax usually broader than long, very little narrowed in front; sides posteriorly 

 distinctly sinuate, dorsal punctures deep; scutellum punctured similarly to the 

 elytra; elytra a little wider than the thorax, conjointly nearly square, black ; sur- 

 face usually aeneous, sparsely punctured, and with brownish pubescence; abdo- 

 men above shining, moderately closely rather coarsely punctate, sparsely pubes- 

 cent, beneath rather less punctured than above ; legs black. Length .JO— .50 inch ; 

 10—12.5 mm. 



JV/a/c— Anterior tarsi moderately dilated, last ventral segment with a small 

 triangular emargiuation surrounded by a slight gutter. 



Female. — Anterior tarsi very slightly dilated, last ventral entii-e. 

 Ihis species belongs to a group of larger forms in the present series, 

 the members of which are by no means easy to separate. The form of 

 the basilar stria of the third and fourth dorsal segments seems to be very 

 constant. I have, liowever, seen one specimen in which the peculiar form 

 is visible on the fourth segment only, and as I have seen but one specimen 

 {viridicol/is Fv. mss. ), and that a female, I feel unwilling to consider it 

 UKjre than a variation. The only other species with similar structure is 

 iitnifns, which is readily separable from aencui^ by the characters of the 

 table. 



I*, f iirvil!^ Nord. — Black, elytra often aeneous, and sometimes j)aler at the 

 sides, sparsely pubescent ; antennaj piceous, nearly as long as the head and thorax, 

 tlie outer joints nearly as wide as long; head moderately large in both se.xes, sub- 

 quadrate, a few coarse punctures behind the eyes; thorax as broad as long, not 

 narrower in front; sides distinctly sinuate posteriorly, dorsal punctures large and 

 deep: elytra a little wider than the thorax, a little longer than wide conjointlv; 

 surface moderately densely punctate, usually bronzed, shining, sparsely pubescent ; 

 abdomen shining, coarsely but not closely punctate, sparsely pubescent, beneath 

 coarsely punctate, the apices of the segment smoother ; legs black. Length .40 — 

 •50 inch; 10—12.5 mm. 



(46) 



