AMERICAN COLEOPTERA. 169 



pubescence. These captured by myself near Teniescal were almost en- 

 tirely deprived of the hair on the thorax and elytra, and are much less 

 densely and coarsely punctured. I can find no differences to warrant 

 specific separation among rny specimens, though the extremes differ 

 greatly in size and in sculpture as above indicated. 



The genus CotaJpa may be separated into two sections, according as 

 the metasternum is produced or not between the middle coxae. 



Metasternum conical, prominent between the middle coxae. 



Thorax scarcely punctured lanigera, Linn. 



Thorax coarsely punctured puncticoUis, Lee 



Metasternum short, obtuse, not produced. 



Thorax coarsely not confluently j)unetured: hairs 



yellowish ursina, Horn. 



Thorax coarsely and confluently punctured : hairs 

 giey granicoUis, Hald. 



In the above table it will be seen that two species have the meta- 

 sternum prolonged forward, so as to be distinctly seen between the 

 middle coxae and even in front of them, this spine being at the same 

 time in the plane of the rest of the metasternum and without any de- 

 pression of its point. In the last two, however, this process is reduced 

 to a mere tubercle below the plane of the metasternum, and is not at 

 all prominent, and never projects beyond the coxae. The species of 

 the first group may be distinguished from those of the second by their 

 greater convexity, more glossy appearance and less elytral punctuation, 

 while from each other no other characters are needed than that given 

 in the table. The epistoma of puncticoUis is relatively much longer 

 and more convex than lanigera. The two species of the second group 

 resemble each other in form. The thorax of granicoUis is, however, 

 metallic-green and very coarsely and confluently punctured, and clothed 

 with erect whitish or greyish-white hairs. In ursina the thorax is 

 much more finely punctured and with the punctures distinct, the hairs 

 are longer and yellowish ; the color of the thorax is bluish-black. 



ERRATUM. 



Page 168, line 16, for "aiipear" read "appears." 



TRANS. AMER. ENT. SOC. (22) JULY, 1867. 



