1855.] 305 



Species unknown to me. 



8. L. quadricollia Mann. Bull. Mosc. 1843, 299. Germ. Zeitschr. 5, 70. 



9. L. protensicol is Mann. ibid. ibid. 5,71. 



10. L. co r di c ol li s Mann. ibid. 300, ibid. 5,105. 



11. L. sobrinus Mann. Bull Mosc. 1852, 362. All from Russian America. 



Monotoma Herbst. 



1. M. productum, elongatum atrum opacum, parce albo-pubescens, capite 

 pone oculos haud dentato, thorace confertissime grosse punctato, latitudine lon- 

 giore, antrorsum paulo angustato, lateribus rectis subcrenatis, angulis posticis 

 acutis, ad basin vage impresso, elytris punctatis rugosis substriatis, interstitiis 

 angustis distinctis ; pedibus nigro-piceis, antennis ferrugineis. Long. *10. 



New York. Larger than the following, and quite distinct. 



2. M. fulvipes, elongatum atrum opacum, parce pubescens, capite pro- 

 funde impresso pone oculos dente acuto armato, thorace confluenter rugose 

 punctato, latitudine longiore, lateribus crenatis late rotundato, angulis posticis 

 obtusis, anticis rotundatis productis, ad basin obsolete bifoveato, elytris piceis 

 scabro-punctatis, rugosis minus distincte striatis, antennis pedibusque ferrugineis. 

 Long. -08. 



Melsheimer, Proc. Acad. Nat. Sc. 2, 111. 

 Monotonia opaca Ziegler, ibid. 2, 271. 



Pennsylvania Dr. Melsheimer. Distinct from the next species by the more 

 elongated thorax, with produced anterior angles and fainter dorsal foveae. 



3. M. foveatum, elongatum atrum opacum, parce pubescens, capite pro- 

 funde impresso pone oculos dente armato, thorace latitudine parum longiore, 

 antice subangustato, lateribus crenatis vix late rotundatis, angulis posticis 

 subobtusis anticis prominulis subrotundati3, confluenter rugose punctato, ad 

 basin fortius bifoveato, elytris piceis minus profunde scabro-punctatis, sub- 

 striatis, antennis pedibusque ferruginei3. Long. .06. 



Ohio, Mr. Wapler, two specimens. 



4. M americanum, atrum, minus elongatum, opacum, parce pubescens, 

 capite leviter impresso, pone oculos obtuse dentato, thorace latitudine fere 

 breviore, antrorsum angustato, lateribus rectis crenatis, angulis posticis sub- 

 acutis, antice vix rotundatis, antennis pedibusque ferrugineis. Long. -07- 



Aube, Ann. EDt. Fr. 6, 461, tab. 



One specimen, Lancaster Co., Pennsylvania. 



5. M. parallelum, atrum elongatum, opacum, fusco-pubescens, capite 

 leviter impresso, pone oculos obtuse dentato, thorace latitudine paulo longiore, 

 lateribus parallelis fere rectis crenulatis, angulis posticis rectis, anticis subpro- 

 minulis, confluenter rugose-punctato, ad basin transversim vage foveato, elytris 

 piceis minus profunde punctatis seriatim pilosis, antenni3 pedibusque ferrugineis. 

 Long. -08. 



One specimen, New York. The striae of the elytra are hardly impressed, as 

 in the preceding species, but seem only indicated by the rows of short bristles, 

 which, as in others, occupy the interstices. 



6. M. m u c i d u m, atrum, elongatum, opacum, fusco-pubescens, capite mo- 

 dice impresso, pone oculos obtuse dentato, thorace latitudine paulo longiore, 

 antrorsum vix conspicue augustatum, lateribus crenulatis vix late rotundatis, 

 angulis anticis subprominulis, posticis obtusis, minus profunde rugose-punctato, 

 postice vage transversim foveato, elytris minu3 profunde punctatis seriatim 

 pilosis, antennis pedibusque ferrugineis. Long. -055. 



One specimen found at the Colorado River in California. Closely resembles 

 in its characters the preceding, but is smaller and has the sides of the thorax less 

 parallel. 



