46 [April, 



Middle, Southern, and Western States and Lake Superior ; Massachusetts. Dr. 

 Harris; (lat. 54 according to Kirby.) This is usually considered as the type of 

 Say's species, and is distinguished by the shining color, by the thorax being more 

 distinctly narrowed posteriorly, with less rounded angles, and by the tubercle 

 between the basal impression and the angle being distinct. The punctures of 

 the base are fine, occasionally extending along the whole base, but sometimes 

 visible only in the impressions. The color of the elytra sometimes varies to- 

 wards bluish and coppery. The under surface is black. 



*. iEneus, nitidus, thorace latitudine paulo breviore, postice angustato angulis 

 posticis rotundatis, impressionibus basalibus tuberculo indistincto instructis. 

 Long. *39. 



Anchomenus obscuratus Chaud. Bull. Mosc. 1843, 763. 



1 Anchomenus clongatulas Dej.' Lee. Ann. Lye. 4, 222. 



Middle States and Lake Superior. 



0. Laete viridi-aeneus, nitidus, thorace latitudine non breviore, postice suban- 

 gustato, basi late rotundata, angulis posticis rotundatis, impressionibus basalibus 

 tuberculo distincto instructis. Long. *39. 



One specimen from Lake Superior, which differs from the type by the thorax 

 being much less narrowed posteriorly, with the posteriorly angles more rounded. 



y. Viridi-aeneus, subnitidus, thorace latitudine longiore, postice subangustato, 

 angulis posticis subrotundatis, impressionibus basalibus tuberculo nullo. Long. 

 35 39. 



Anchomenus viridis Lee. Ann. Lye. 4, 222. 



Western States ; a specimen was sent me by Dr. Harris, as Anch. extensicollis 

 Say. 



ef. Cyaneus, subnitidus, thorace latitudine longiore, postice vix angustato, an- 

 gulis posficis subrotundatis, impressionibus basalibus tuberculo nullo, elytris 

 striis profundioribus, haud punctulatis. Long. *34. 



Northern Sonora, near the Gila River. Resembles (y) except in color; the 

 striae of the elytra are, however, deeper and not at all punctulate. 



g. Capite thoraceque aeneo-viridibus, hoc latitudine vix longiore, postice sub- 

 angustato, angulis posticis fere rotundatis, impresionibus basalibus tuberculo 

 distincto instructis, elytris cyaneis, striis profundioribus obsolete punctulatis. 

 Long. *35. 



One specimen found with the preceding. 



15. P. simplex, supra aeneo-viridis, subnitidus, thorace latitudine non bre- 

 viore, postice subangustato, angulis posticis obtusis subrotundatis, basi laevi, 

 utrinque longius impresso, elytris striis tenuibus impunctatis interstitiis vix con- 

 vexis 3io 5 8 punctato, antennarum basi pedibusque piceo-testaceis. Long. -3 

 37. 



Colorado River, California. Has very much the form of (J) of the preceding 

 species, but the thorax is absolutely free from punctures ; in some specimens the 

 thorax is more distinctly narrowed at the base, but the difference is not well 

 marked : the base of the thorax is occasionally piceous, as in the dark colored 

 specimens of the next species, from which it is distinguished by the interstices 

 of the elytra being smooth. The under surface is black, the epipleurae tinged 

 with piceous. 



16. P. decorns, capite viridi-aeneo, thorace saepius rufo (nonnunquam piceo- 

 virescente) latitudine vix breviore, basi paulo angustato, angulis posticis obtusis 

 subrotundatis, basi fere laevi, utrinque longius impresso, elytris striis tenuibus, 

 interstitiis fere planis sat distincte punctulatis brevissime vix distincte pilbsis, 

 3io punctis 5 7 impressis, antennis basi pedibusque rufis. Long. *3l 34. 



Lee. Agassiz' Lake Superior, 205. 

 Feronia decora Say, Trans. Am. Phil. Soc. 2, 53. 

 Anchomenus decorns Dej. Sp. Gen. 3, 115. Lee. Ann. Lye. 4, 223. 

 Anchomenus obscurvs Lee. Ann. Lye. 4, 223. (Var. pedibus fere piceis, tho- 

 raceque viridi.) 



