232 GEORGE H. HORN, M. D. 



N. coiivexa Say, Journ. Acad, iii, p. 443; ed. Lee. ii, p. 212. — Form more 

 riMily oval and more couvex than tristis, surface nearly always dull, variable in 

 color, blue and bronze, or slightly greenish ; clypeus broad between the antennae. 

 Head variably punctate, with a more or less distinct median impression. Thorax 

 as in tristis. the punctuation less close, the median line usually smoother. Elytra 

 much more coarsely punctate than the thorax, without any trace of strise. except 

 at the apex, umbone feeble. Propleurie moderately coarsely, but very sparsely 

 punctate, sides of metasternum more coarsely and closely. Abdomen alutaceous, 

 very sparsely punctate. Legs piceous. Length .15 — .18 inch. ; 4— 4.5 mm. 



This species is larger, more truly oval and less shiniug than any 

 in our fauna, so that it can with ease be selected from the others by 

 sight. It differs especially, however, in having the sides of the 

 metasternum coarsely punctured. 



Occurs in Pennsylvania, Illinois, Dacota, Wisconsin. Dr. Ham- 

 ilton finds it on the great ragweed, Ambrosia frijida, in river bottoms. 



N. pnucticollis Say, Journ. Acad, iii, p. 444; edit. Lee. ii, p. 212; hume- 

 ralis Lee, Proc. Acad. 1858, p. 85; strigicollis Lef., Eev. Mag. Zool. 1875, p. 112. — 

 Form oblong, slightly parallel-sided, blue, green or olivaceous, moderately shin- 

 ing. Antennse rufo-testaceons, the outer five joints piceous. Head distinctly 

 alutaceous, moderately coarsely, but not closely punctured, clypeus broad. 

 Thorax rather more than twice as wide as long, sides feebly arcuate and gradu- 

 ally convergent to the front, the front angles acute, but not everted ; disc con- 

 vex, distinctly alutaceous, moderately closely punctate, the punctures elongate 

 and substrigose. Elytra coarsely irregularly punctate, striate near apex, the 

 disc often with smooth stripes representing costse, umbone moderately promi- 

 nent, with a subcostiform prolongation posteriorly, a distinct depression within 

 the umbone. Propleurse alutaceous. sparsely coarsely punctate, metasternum 

 alutaceous not punctate. Abdomen alutaceous, sparsely obsoietely punctate. 

 Legs i)iceous, very rarely pale. Length .13 — .17 inch.; 3.5 — 4.25 mm. 



The first joint of the anterior and middle tarsus is dilated in the 

 male. 



This species may be recognized by its more oblong and less convex 

 form, with the punctures of the thorax substrigose. 



Occurs from Pennsylvania westward to Kansas, Dacota and Mon- 

 tana, southward to North Carolina. Specimens sent me by Dr. 

 Hamilton were collected on the wild rose. 



IUKTAPAKIA Cr. 



This genus seems not to have been seen by Lefevre, and is placed 

 with a few genera of uncertain position. It belongs to the Iphimeites 

 as recognized by Chapuis, but which has been divided by Lefevre 

 into the Chrysodinitte and Iphimeita? on characters which seem illu- 

 sory as far as our genera illustrate them. 



