1855.] 347 



parallelis, humeris vix rotundatis, dorso planiusculis, striis profundis crenulalis 

 postice laevibus ; pedibus rufo-piceis, anteriovibus antennisque paulo pallidiori- 

 bus, postpectore parce punctate Long. 45. 



One male found at San Diego, California. Narrower than the following 

 species, and with the thorax more narrowed at the base, and more strongly 

 sinuated on the sides. From the preceding, which it resembles in the form, it 

 differs by the basal impressions of the thorax being deeper, and hardly btstriate, 

 by the posterior angles being somewhat less prominent, by the elytra being less 

 parallel, comparatively shorter and more obtusely rounded at the extremity. 



4. A.laticolli s, oblonga latiuscula, piceo-nigra,subcenescens, thorace latitu- 

 dine plus sesqui latiore postice angustato, lateribus valde rotundatis, ante basin 

 sinuatis, angulis posticis rectis prominulis, ad apicem et basin parcius punctato, 

 impressionibus basalibus profundis subbistriatis, carina externa acuta; elytris 

 thorace haud latioribus, dorso planiusculis, striis profundis crenulatis postice 

 laevibus ; epipleuris antennis pedibusque rufis, postpectore punctato. Long. 

 45 -55. 



Curtonotus laticollis Lee. Ann. Lye. Nat. Hist. New York, 4, 368. 



? Curtonotus convexlusculus Kirby, Fauna Bor. Am, 35. 



Found in Nebraska Territory, near the Rocky Mountains. Very similar to 

 the European A. convexiuscula, but in comparison with that species, the thorax 

 is more rounded on the sides, more narrowed behind, and more finely margined, 



5. A. carinata, oblonga, latiuscula, piceo-nigra, subaenesevns, thorace 

 latitudine plus sesqui latiore, postice angustato, lateribus rotundatis ad medium 

 subexplanatis ad basin brevissime sinuatis, angulis posticis subprominulis, ad 

 apicem et basin punctato, impressionibus basalibus profundis subbistriatis, carina 

 externa acuta : elytris thorace haud latioribus, dorso planiusculis, striis profun- 

 dis subtiliter crenulatis postice laevibus ; epipleuris antennis pedibusque rufis, 

 postpectore punctato. Long. *45. 



LeConte, Ann. Lye. New York, 4, 368. 



Nebraska Territory, near the Rocky Mountains. In comparison with the 

 preceding, which it closely resembles, the sides of the thorax are considerably 

 less rounded, and less suddenly sinuate towards the base, and the basal angles 

 although rectangular are less prominent ; the sides are slightly flattened about 

 the middle. The insect from Russian America referred by Mannerheim to this 

 species is much smaller and otherwise different ; it will be found below as 

 A. i n f a u s t a . 



6. A. stupid a, oblonga latiuscula nigro-picea, thorace latitudine fere duplo 

 breviore postice magis angustato, lateribus rotundatis ad basin vix brevissime 

 sinuatis, angulis posticis rectis vix prominulis, ad apicem et basin punctato, 

 impressionibus basalibus minoribus haud striatis, carina externa latiore : elytris 

 thorace vix latioribus dorso planiusculis, striis cvenatis ad apicem laevibus, 

 antennis pedibusque rufis, postpectore punctato. Long. -5. 



One female from Sacramento, California, given me by Mr. Rathvon. Resem- 

 bles entirely in its form A. carinata, but the thorax is more narrowed at the 

 base, the basal impressions are smaller and less deep, and the external carina is 

 shorter and less elevated. 



7. A. infausta, oblonga, nigro-picea, supra subaenea, thorace latitudine 

 sesqui breviore, postice paulo angustato, lateribus rotundatis ad basin brevissime 

 subsinuatis, angulis posticis rectis haud prominulis, ad apicem et basin punctato, 

 impressionibus basalibus valde profundis bistriatis, carina externa valde dis- 

 tincta acuta; elytris thorace haud latioribus convexiusculis, striis crenulatis, 

 minus distincte versus apicem ; antennis pedibusque rufis vel rufo-piceis, epi- 

 pleuris vel rufis vel obscure-piceis, postpectore punctato. Long. 4 -45. 



Leirus rvfimanvs\\ Motschulsky, Mm. Acad. St. Petersb. J 842, 176. 



Leirus carinatus Lec.'t Mannerheim, Bull. Mosc. 1853, No. 31. 



Russian America. Specimens have been kindly furnished me under the 

 names above cited by Baron Chaudoir and Mr. Motschulsky. It is a narrower 

 and smaller species than A. carinata, and the basal impressions, although very 



