122 GEO. n. noRN, m. d. 



Thoracic lobe not elevated, surface regularly convex. 



Metasternuni very densely punctulate, punctures closer together tlian 



their own diameter octoniaculatiiM. 



Metasternum more shining, moderately punctured, puncturos di-tant 



at least their own diameter pcctiiiutiis. 



Second joint of hind tarsi longer than third, subeylindrioal. Lobe of 



thorax neither carinate nor notched frut'iitlis. 



Anterior coxae separated in nearly their entire length by a slender prolonga- 

 tion of the prosternumj vertex scarcely elevated, obtuse and nearly ini- 

 puncturod. 



Second joint of hind tarsi longer than half the third and not flattened above. 



Epistoma oval linearis. 



Second joint of hind tarsi shorter than half the third and flattened above. 

 Epistoma truncate liiiibatiis. 



Rli. flavipcnuiN Lee. New Spec. 1866, p. 153 ; abdominalis 9 Lee. 1. c. 

 p. 151. 



Male. — Color entirely black, elytra pale yellow. Vertex slightly concave in 

 front, moderately punctured, upper edge sometimes rounded, frequently sub- 

 truncate or even slightly emarginate. Antennae pale luteous. Thorax moder- 

 ately densely punctured, a slight impression on each side of the middle in 

 front, basal lobe strongly elevated, and produced at tip. Elytra contiguous for 

 a short distance at base, rapidly narrower and very acute at tip. Body beneath 

 black, not densely punctured. Legs black, spurs and claws yellowish. Second 

 joint of hind tarsi scarcely shorter than the third, not flattened above. 



Var. — First three segments of abdomen red. California. 



Female. — Black, abdomen red. Elytra pale yellow at basal half, tip black. 

 Antennae black, basal joint piceous, second somewhat paler. 



Length .30— .40 inch ; 7.5—10 min. 



This species occurs in Pennsylvania, Georgia, Illinois and California, 

 (Owen's Valley). 



Rh. diiiiidiatiis Fab. Spec. Ins. L, p. 332; Oliv. Ent. III., C5, p. S, pi. 

 1, fig. 8, a — b; llentz, Trans. Am. Phil. Soc. III., p. 464; Gerstaecker Monog. p. 

 21; viarginali.'i % Lee. New Species, 1866, p. 154. 



Male. — Body entirely black, elytra pale yellow, with the outer and sutural 

 margins and tip narrowly bordered with black. Antennae pale luteous. 

 Thorax without apical impression, lobe feebly convex, transversely emarginate. 

 Elytra flat, sparsely punctured, smooth, rapidly narrower and very acute at 

 tij). Vertex in front moderately convex, smooth, very sparsely punctured, 

 above rounded. Legs black, spurs and claws rufous. Second joint of hind 

 tarsi shorter than the third and flattened above. 



Female. — Body black, elytra with basal half pale yellow, ajiical half black. 

 Antennae piceous, two basal joints rufous. 



Length .20— .30 inch; 5 — 9 mm. 



The male in uiy cabinet came from the collection of Count Dcjean 

 and was given me by Mr. Fred. Bates. It bears the name jiaviconiis. 



The species thus far is known within the limits of New York, 

 Florida and Missouri. 



