72 GEORGE H. HORN, M. D. 



0. nitidum, Lee. Am. Lye. IV, p. 347; niiens Chaud. Rev. Mag. Zool. 1S68, p. 7; 

 uot liitidmn Chaud. coll. 



Our most broadly oval, convex and shininpj species. Differs from 

 hihiatum in having the striae of the elytra less impressed, the punc- 

 tures larger, more distant and extending fully two thirds the distance 

 from the base to the apex. The punctures forming the lateral striae 

 are also well defined. The color of the entire upper surface is metal- 

 lic green, the elytral pale border narrow, broader at the humeri ; from 

 this border slightly behind the humeri a small process enters, at right 

 angles to the border, to the eighth stria and becomes gradually nar- 

 rower to the apex; behind the middle another process extending; 

 obliquely forward to the sixth stria gradually narrowing and with 

 sinuous margins ; near the apex a subquadrate process parallel with 

 the suture but separated from it by the first interval, and with its 

 tips emarginate. Thorax similar to lablatum, pale margin impunc- 

 tured, basal and apical regions coarsely but not densely punctured. 

 Head metallic green, coarsely and very sparsely punctured, with the 

 frontal spot and clypeus pal--,; labrum silvery-white. Under surftice 

 somewhat paler than lahiatum. Length, .20 — .24 inch ; 5 — 6 mm. 



Occurs in Illinois, Kansas, Indian Territory and Texas. 



The synonyms have been suggested to me by Dr. Leconte in a late 

 letter from Paris, where he had an opportunity of inspecting that por- 

 tion of the cabinet of Chaudoir containing Oniophron. He also states 

 that 0. nitidumX Chaud. (cabinet) is still undeseribed and is from 

 Louisiana. 



0. gilae, Lee. Ann. Lye. Y. p, 201. 



The characters given in the preceding table render any detailed de- 

 scription unnecessary. The prevailing color of the upper surface is 

 pale yellowish. Head coarsely and sparsely punctured between the 

 eyes; vertex somewhat darker. Thorax very coarsely but sparsely 

 punctured over its entire surface, with the median line distinctly im- 

 pressed, and with a transverse greenish metallic spot equalling in 

 length about half the width, and in its width about half the length of 

 the thorax. The elytra have on each side of the scutellar region a short 

 greenish space extending along the basal margins sending three short 

 processes backward, the first on the interspaces 7 — 8, second on inter- 

 space 10, third on interspace 12. The space between the suture and first 

 stria is dark and near the apex expands into a small rhomboidal spot. 

 From the suture outward on each side, at the anterior third a triangular 

 dark spot, apex at suture, base at stria 6; between the latter spot and the 

 margin a small subijuadrate spot between striae 8 — 12; at the posterior 



