130 MEMOIRS ON THE COLEOPTERA 



Prothorax very moderately narrowed posteriorly, the base fully three- 

 fourths the maximum width 2 



Prothorax strongly narrowed posteriorly, the base very distinctly less 

 than three-fourths the maximum width 3 



2 Form more elongate and less ventricose, the elytra (cf ) longer, fully 

 two-thirds longer than wide and barely a third wider than the pro- 

 thorax, the latter larger than in adoxus but of the same general form, 

 except that the basal angles are distinctly rounded; elytra similar 

 in striation, except that the scutellar stria is very short, being 

 simply a posterior attenuation of the fovea; legs rufo-castaneous, 

 the femora a little darker. Length (cf 1 ) 13.5-13.8 mm. ; width 4.8 mm. 

 New Jersey and Pennsylvania rejectus Lee. 



Form less elongate and more ventricose; head moderate, the impressions 

 rather fine but deep, arcuate and diverging; epistoma sinuato- 

 truncate, the labrum rectilinearly truncate; prothorax nearly as 

 long as wide, the sides rounded, gradually converging, becoming 

 straight posteriorly, then broadly and very faintly sinuate to the 

 angles, which are sharp and generally slightly prominent, the single 

 latero-basal impression long, broadly and deeply concave, the stria 

 distinct but not entire; apex very feebly sinuate, the angles scarcely 

 advanced and well rounded; elytra (cf ) only about one-half longer 

 than wide and fully two-fifths wider than the prothorax, the scutellar 

 stria long and deep. Length (cf 9 ) 11.5-14.0 mm.; width 4.0- 

 4.8 mm. Rhode Island and Lake Champlain to North Carolina 

 (Asheville). Fifteen examples, [tristis Dej. and interfector Newm.]. 



adoxus Say 



3 Head smaller, less than three-fifths as wide as the prothorax, the 

 impressions rather deep, arcuate though subparallel, the eyes larger 

 than in adoxus but less convex; prothorax relatively still smaller, 

 nearly as long as wide, the sides more strongly rounded, more con- 

 verging posteriorly and becoming very deeply sinuate for a long 

 distance before the angles, which are acute and laterally very 

 prominent; base much more deeply sinuate; apex more sinuate, 

 the angles less rounded; surface similarly convex, the impressions 

 and median stria nearly similar; elytra still shorter, less than one- 

 half longer than wide, two-fifths wider than the prothorax, the striae 

 similarly very deep though not wholly unmodified as they are in 

 adoxus, but faintly crenulate, the scutellar shorter but evident. 

 Length (cf) 11.5 mm.; width 4.25 mm. Locality unrecorded. 



zephyrus Csy. 



Head as in adoxus, fully three-fifths as wide as the prothorax, the im- 

 pressions similar, the eyes rather large, very convex; prothorax 

 nearly similar, except as stated above, and in being slightly narrower 

 and apparently somewhat longer than wide; elytra notably narrower 

 and more elongate, evidently more than one-half longer than wide, 

 fully two-fifths wider than the prothorax, the striae very deep, smooth 

 and unmodified, the intervals very convex, the scutellar stria long. 

 Length (9) 11.3-12.5 mm.; width 4.4-4.6 mm. Wisconsin (Bay- 

 field), Wickham tetricula n. sp. 



