AMERICAN COLEOPTERA. 309 



convenience for separation, it must be admitted that there are minor dif- 

 ferences of aspect or sculpture not easy or practicable to describe which 

 really distinguish species in the cabinet, and in many the sexual charac- 

 ters of the male afford the only means of giving expression to recognized 

 differences. 



In the varieties above indicated I see no reason for drawing the spe- 

 cific line anywhere, there are none of these minor differences of aspect 

 and sculpture, nor is the habitat a factor in the kind of variation. I have 

 concluded to unite these forms under one name and have placed the 

 varieties in separate places in the table, so that all the forms may be re- 

 cognized. 



Male. — Elytra at tip somewhat swollen, smooth and impressed. When the tip 

 is yellow the impression is always black. 



Female. — Elytra not swollen at tip, punctured. 



The form Lewisi occurs in Colorado ; monticola in California, Nevada 

 and Montana ; variabilis in Colorado, Montana, New Mexico and Ari- 

 zona. The totally black specimens are from Arizona. 



12.— C. I'lilvipes Newm., Ent. Mag. V, p. 375. — Black, shining, legs yellow. 

 Elytra coarsety and moderately densely punctured. Thorax sometimes reddish 

 brown. 



Male. — Elytra at tip yellow, swollen, smooth, impressed. 

 Occurs in New York, Ohio, Michigan and Canada. 



13.— C Newmani Lee, Proc. Acad. 1855, p. 274 ; lagubris |] Newm. 



This species agrees in most respects with fulvipes, except that the legs 

 are black. The apical spot of the male is however smaller, and the ely- 

 tra less coarsely and densely punctured. 



Occurs in Maine, Canada and New York. 



14.— €. cyanipeniiis Bland, Proc. Ent. Soc. Phila. 1804, p. 2(54.— Piceous, 

 tibiae, tarsi, antennae and palpi yellow. Elytra blue, coarsely but not densely 

 punctured. 



Male. — Elytra slightly swollen at tip, impressed and smoother, not yellow. 



Female. — Elytra not swollen nor impressed. 

 Occurs in New Hampshire and Virginia. 



15. — C. pulchra Lee, Jour. Acad. ser. 2, 1, p. S3. — Piceous. legs and two 

 basal joints of antennae pale. Thorax red, with broad median black space. Elytra 



densely punctured. 



Male. — Elytra not more convex at tip, deeply impressed and smoother only in 

 the impression. 



Female. — Elytra nearly equally punctured to tip. 

 Occurs in Ohio, Missouri, Dakota and Montana. 



16.— C. labiata Say, Jour. Acad. 1827, p. 247. — Piceous, clypeus pale yel- 

 low. Thorax red, with broad median black space.. Elytra densely punctured. 

 Sexual characters as in pulchra. 



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