Platynin^ 125 



joints equal; prothorax between a third and fourth wider than 

 long, widest near the middle, with distinctly arcuate and strongly 

 reflexed sides, which become straighter and widely reflexed basally, 

 the angles somewhat evident, obtuse and rather blunt; base fully 

 as wide as the deeply sinuate apex, arcuate and oblique laterally; 

 surface with rather deep transverse rugulae, the anterior impression 

 feeble, the stria strong, abbreviated at base; basal region and 

 foveas sparsely but evidently punctulate, the foveae large, deeply 

 concave, not anteriorly prolonged; elytra oblong, one-half longer 

 than wide, barely one-half wider than the prothorax, very gradually 

 ogival behind, the sinus shallow; sides rapidly rounding at base; 

 striae not very fine, grooved, finely, closely punctulate throughout, 

 not deeper at apex; intervals flat throughout, the three punctures 

 distinct; ninth stria half as far from the edge as from the eighth; 

 anterior male tarsi pallid, moderately dilated. Length (cf 9 ) 7-8- 

 8.2 mm.; width 3.0-3.1 mm. Canada (Regina),— Willing; Wyoming 

 (Cheyenne),— Leng. Nebraska,— LeConte. [PI. suhcordatus Lee.]. 



errans Say 



The various subordinate forms of placidiim can be defined satis- 

 factorily only after prolonged study, with ample material. One 

 specimen , from Rhode Island, is the smallest known to me and has 

 the antennal joints evidently more abbreviated; it is not included 

 in the measurements under placidum, being only 6.q mm. in length. 



The species identified as errans above, seems to be typical in all 

 respects, except the form of the hind thoracic angles; these are 

 said to be rounded by Say, and LeConte states that they are 

 "obtusis rotundatis" in both errans and suhcordatus. In LeConte's 

 Nebraska specimen of errans, the elytral striae are said to be "abso- 

 lutely without punctures," while in the type of suhcordatus they 

 are described as finely punctured toward base. In the Wyoming 

 specimen here identified as errans, the basal thoracic angles are 

 much more than right, in fact notably obtuse, but their tips are 

 sharply defined and not so blunt as in collare. In Agonum 

 erythropus Kirby, the body is said to be bronzed above, the pro- 

 thorax obcordate, tinted with copper and with rounded hind 

 angles, the legs dusky rufous. 



Europhilus Chd. 



There is a peculiarity of habitus that renders any member of 



this genus recognizable at a glance. The form is notably elongate, 



with the surface distinctly convex, and the prothorax is impunctate, 



having very moderate smooth foveae and finely reflexed margins; 



