PTEROSTICHIISLE 369 



and southward to Pennsylvania. Less abundant, larger and stouter 

 than stygica. [Pt. ni&rens Newm.] coracina Newm. 



Body narrower and more elongate, similar in color and lustre, but with 

 the strial intervals less convex and the two dorsal punctures much 

 coarser; head less broad, the eyes evidently not so large, the sulci 

 shorter and parallel ; prothorax less dilated anteriorly and very nearly 

 as long as wide, the sides coarsely reflexed, especially behind, and 

 subevenly arcuate throughout; basal angles very obtuse but not more 

 than blunt; impressions, fovese and carina subsimilar; base fully as 

 wide as the apex; elytra relatively narrower, fully three-fourths longer 

 than wide, nearly a fourth wider than the prothorax, the sinus very 

 long and barely traceable; strial punctulation extremely minute. 

 Length (c?) 15.5 mm.; width 5.3 mm. Pennsylvania, .flebilis Lee. 



10 Form rather narrower and more elongate than in coracina and with 

 relatively smaller prothorax, the coloration and polished lustre sim- 

 ilar; head larger, almost three-fourths as wide as the prothorax, the 

 eyes similarly large and prominent and the broadly impressed sulci 

 slightly converging; prothorax but very little wider than long; base 

 as wide as the apex, broadly arcuate laterally, the angles blunt and 

 very obtuse; sides arcuate, lesS so posteriorly, not quite so coarsely 

 reflexed as in the two preceding, the transverse impressions distinct; 

 carinse coarse, irregular, subadjacent to the sides posteriorly; elytra 

 nearly as in coracina but narrower, nearly three-fourths longer than 

 wide, a third to fourth wider than the prothorax; punctulation of 

 the very deep striae obsolete; intervals very convex; sinus feeble but 

 distinct. Length (cf) 13.8-16.8 mm.; width 4.8-5.8 mm. Penn- 

 sylvania and New York (Adirondacks) adjuncta Lee. 



Form still narrower, smaller in size, deep black and polished; head well 

 developed but not so large as in the preceding, the eyes prominent; 

 sulci broadly impressed and parallel; antennae moderately long; 

 prothorax a fifth wider than long; base scarcely as wide as the apex; 

 anterior impression deep, the posterior rather feeble and more diffuse, 

 widest before the middle as usual, the sides coarsely reflexed and 

 arcuate throughout, less so basally, the angles very broadly rounded; 

 foveal cavity very deep, longer than wide, only feebly rugose, the 

 carina strong, almost adjoining the margin posteriorly; elytra with 

 more broadly exposed and more rapidly rounding humeri than in 

 any of the preceding, three-fifths ( 9 ) to three-fourths (c?) longer 

 than wide, a fourth to third wider than the prothorax; punctulation 

 of the very deep striae virtually wanting, the intervals very convex; 

 sinus rather short and distinct. Length (cf 9 ) 14.0-15.7 mm.; 

 width 4.8-5.3 mm. Lake Superior (Bayfield and Marquette). 



erebea Csy. 



II Form elongate, not very stout, somewhat attenuated anteriorly, 

 deep black, shining; head well developed, not quite three-fourths as 

 wide as the prothorax; eyes moderate but prominent, the sulci 

 feebly converging; antennae fully half as long as the body in the male; 

 prothorax relatively smaller than in most of the preceding species, 

 only slightly wider than long, widest anteriorly, the sides coarsely 

 T. L. Casey, Mem. Col. VIII, Oct. 1918. 



