30. 



Codes, Bon. 



Our species have been divided by Chaudoir (Bull. Mosc. 1857. Ill, pp. 20 21,) in- 

 to three genera. See Dr. Horn. Trans. Am. Ent. Soc. Ill, p. 105. 

 Ligula free at apex. 



First joint of anterior tarsus $ entirely spongy beneath ; elyti a with seven striae equal- 

 ly distinct (OOI >ES, Chaud.) 



Thorax gradually broader from base to apex aniaroi&es. 



Thorax slightly narrowed at base. 



Elytral stria; distinctly and closely punctured americailUS. 



Elytral stria; finely and distantly punctured fluviallS. 



First joint of anterior tarsus $ spongy only at apex; seventh elytral striae either en- 

 tirely obliterated or replaced by fine distant punctures. (STENOUS, Chaud.) 

 Thorax gradually broader from base to apex, sides not sinuate behind. 



Elytral striae faint and with punctures in their entire length; tibia.' pale testa- 

 ceous cuprous. 



Elytral strife deeper, impunctured; legs entirely piceous LsCCIltei. 



Thorax with sides distinctly sinuate behind ; elytral stria; distinct, punctured only 



at base elegailS. 



Ligula and paraglossse more or less connate; first joint of anterior tarsus q spongy 

 only at apex, seventh elytral stria; either obliterated or replaced by distant fine 



punctures (CROSSOCREPIS, Chaud.,) 



Striae impunctured, seventh wanting (JU&tUOr&ecimstriatus. 



Striae punctured, seventh replaced by a row of indistinct punctures tsZaUttS^ 



O. amaroides, Dej. Spec. V, 674. — 7.5-9 mm. N. Y. Pa to Tex. toKans. 



O. americanus, Dej. Spec, II, 377. — 12.5 mm. N. Y, to Ga. Very common in 



Jersey City near the big swamp. 

 O. jluvialis, Lee. New Spec. p. 13. — 12.5 mm. H\s.=cupreus? Chaud. Bull. Muse. 



1843. IV, 761. =leucodactylw, Ferte. Ann. Fr. 1851. 273. — 10 mm. N. Y., Pa. to 



La, and Mo. 

 0. Lecontei, Chaud. Bull. Mosc. 1857. Ill, A t \.=(]iiatuorderimstriains,\j£C. Ann. Lye. 



IV, 331. — 10 mm. La. 

 O. elegans, Lee. Ann. Lye. V, 180. — 10-10.5 mm., Ariz. 

 O. quatuor decimstriat 'us. Chaud. Bull. Mosc. 1843. II, 759. =picipes, Lee. Proc. Acad. 



II, 52. Ann. Lye. VI, ^\.=stenocephala, Laporte, Ann. Fr. 1854, 271. — 11.5 m. 



La. Tex. 

 O. texanus, Lee. New Spec. 13. — 11.5 mm Tex. 



Evolenes, Lec , 



Closely allied to Oodes, but differs in the shorter and stouter antenna;. 



Black, thorax piceo-rufous, elytra faintly striate, striae with fine punctures, the sixth, 

 and seventh less distinct impressa. 



Piceo rufous, elytra deeply striate, the stria; crenate 1 punctured, the seventh as dis- 

 tinct as the others exarata. 



E. impressa, Lec. Trans. Am. Phil. Soc. 1853. p. 392. — 3 mm. La. 

 E. exarata, Dej. Spec. V, 678. Lec. Trans. Am. Phil. Soc. 1853,392. — 6 mm. Ga. Ala. 

 Has the appearance of Amara musculis, Say. at first sight. 



