NORTH AMEIilCAN COLKOPTERA. 



231 



Clypeus much contractecl between the insertion of the antennte. 



Surface above finely punctate, beneath not or but little punctate..cly|>ealis. 

 Clypeiis broad between the antennte. 



Form short, oval: imnctuation of thorax simple; elytra with no post-iuuboual 

 costa. 

 Sides of nietusternuni not at all punctate: upper surface shinin<i...tristis. 



Sides of metasternuni coarsely punctate: upper surface dull coiivexa. 



Form oblong, subparallel ; punctuation of thorax substriKOse. 



Elytra with distinct post-umbonal costa l>Uiicticollis. 



All these species belong to the Atlantic region. 



JV. ti'istis Oliv., Ent. vi, p. 889, pi. ii, fig. 23; pilula Germ., Ins. spec. nov. 

 p. 567.— Regularly oval, convex, feebly shining, color variable, dull bronze, 

 slightly cupreous, bluish or bluish green. Antenna- pale at base, outer five joints 

 piceous. Head variably punctate, sometimes sparsely and finely, or again rather 

 coarsely and moderately closely: clypeus broad between the antennae. Thorax 

 more than twice as wide as long, narrowed in front, sides slightly arcuately con- 

 vergent to apex, front angles alone prominent, disc convex, surface very finely 

 alutaceous, subopaque, the punctuation simple, usually moderately close, but less 

 so at base and sides. Elytra oval, convex, the umbone distinct, but not promi- 

 nent, sometimes with a slight impression within it, surface more coarsely punc- 

 tate than the thorax, usually very irregularly and then more closely, sometimes 

 more sparsely and then vaguely substriate, a sutural stria is usually well marked 

 from the apex to middle. Propleurai sparsely punctate, metasternum at sides 

 not punctate, abdomen alutaceous, sparsely punctate, sometimes slightly trans- 

 versely wrinkled. Legs piceous, very rarely rufo-testaceous. Length .11— .15 

 inch.; 3 — 4 mm. 



The males have the first joints of the anterior and middle tarsi 



distinctly dilated. 



This is the form most abundantly found, and the one in which the 

 tendency to a substriate arrangement of the elytral punctures is 

 most evident. The characters given in the analytical table are those 

 which best serve to separate it from the other species. 



Occurs from the Middle States to Kansas, southward to North 

 Carolina. Lives on various upland weeds, Lespedeza and Ceanothm 

 (Hamilton). 



N. clvi>«'alis 1- sp.— Very like (ristis in form, size and color, and differs in 

 having the clypeus much contracted between the insertion of the autennse. The 

 surface is much less distinctly and more sparsely punctate. The propleurse have 

 very few punctures, the sides of metasternum smooth. Abdomen quite smooth, 

 very sparsely finely punctate. Length .14— .15 inch. ; 3.5—4 mm. 



The males are as in tristis. 



This species is either comparatively rare or has been overlooked 

 and mi.xed witii tristis. 



Specimens are known to me from eastern Pennsylvania, North 

 Carolina and Texas. 



TKANS. AM. KNT. SOC. XIX. AUGUST. 1892. 



