AMERICAN COLEOPTERA. 



271 



head similarly punctured, and the stride and punctuation of the elytra 

 the same. The anterior femora of % are as in serireus. 



One specimen % in my cabinet from Texas, another a 9 with Dr. 

 Leconte, from Tamaulipas, Mexico. 

 37. €. sericens, Forst. 



This species is so well known to every collector as to need but 



little mention. 



The head is punctured as in diffinis. Antennae usually pale, frequently 

 (rejTM/arts), with the outer joints darker. The thorax varies greatly in form, 

 being nearly quadrate at times or as broad as in latico/lifi. The punctuation is 

 moderately coarse, very dense and rather deeply impressed. Strise fine and 

 with rather fine, distant punctures, varying but little in size from base to apex; 

 intervals moderately densely but finely punctate. Prosternum scarcely mar- 

 gined at tip, in front coarsely and densely punctured, episterna coarsely and 

 less densely punctured. Metasternal episterna long, moderately coarsely and 

 densely punctate. Abdomen more densely punctured at sides than at middle. 

 Length .50— .68 inch; 12.5—17 mm. 



The anterior femora of the I although rather rapidly narrowed at 

 base, can hardly be called subangulate. 



The color of the upper surface is subject to very great variation. 

 The specimens from the east of the Rocky Mountains and those from 

 Oreiion are bright green, and as we go farther south in the Pacific 

 region the specimens lecorae gradually darker, and two in my cabinet 

 are nearly of the color of diffinis. These darker forms are cal ed 

 regularis, Lee, Chaudoir having suggested their identity with sericens, 

 After a careful study of a large series in my cabinet, 1 am convinced 

 that there is no character by means of which they may be separated. 

 Certain forms approach viridifrons but the latter has a much longer 

 thoracic sinuation, and the base is scarcely narrower than the apex, 

 and the form more depressed. 



Occurs everywhere in the United States and Canada. 



38. C. fuscicornis, Dej. — Body beneath black, above black with faint 

 tinge of blue, legs pale, tarsi piceous. Head rugulose at the sides, punctured 

 behind, middle smoother. Antennse brown, two basal joints paler. Thorax as 

 long as wide, base broader than apex, sides moderately arcuate in front, slightly 

 narrowed but not sinuate posteriorly, surface densely and rather coarsely 

 punctured. Strise fine and finely punctured, intervals flat and rather densely 

 punctulate. Prosternum not margined at tip, coarsely but sparsely punctured 

 in front, episterna coarsely punctured. Metasternal episterna long, moder- 

 ately densely punctured. Abdomen as in striceus. Length .84— .90 inch," 

 21—23 mm. 



Anterior femora of % simple at base. 



This and the next are our largest species. 



Occurs in the Gulf States, also Illinois and Missouri. 



