NOKTII OF MEXICO. : ' s l 



Head neither tuberculate nor horned. 



Thorax rufous, elytra black. run col If. 



Thorax and elytra Mack. 

 Surface opaque. 



Elytra without red spots. 



Antenna' pale. ruficor n e . 



Antenna' black, three basal joints pale. rl a \ ip e s . 



Antenna' black, three basal pale, terminal ferru- 

 ginous, j a nus . 

 Elytra with an oblique red spot on each. elliptic um. 

 Surface shining black. 



Presternum horizontal, apex prominent. 



Head with distinct transverse groove and frontal 

 impression. 

 Frontal impression rather deep; species broader, oregonense. 

 Frontal impression faint; species less rounded, americanum. 

 Head without transverse impression. 



Thorax very sparsely punctured; surface less 



shining. la <■ \ i p 



Thorax densely punctured ; species small, 



shining, black. m i c a i 



Presternum convex between the coxa? ; apex deflexed 

 and obtuse. 

 Smaller species, black, with an aeneous tinge, picilabrum. 



more elongate. 

 1 rgi r species, black, more broadlj oval. subcostatum, 



I', excavatum, Say. (Diaperis Journ. Acad. ::. 



A very abundant species over the entire district East of the Rocky Mountains; easily 

 recognisable by the black color, shining surface ami corniculate head. Specimens occur 

 in the Western v of rather more elongate form ami less deeply striate elytra. 



1, ngth .18-.21 inch. 



I', cyanescons, Lap. el Brulle, Ann XXIII, p. 



Diners from the preceding, in is more elongate form, less rounded sides ami by its 

 blue color. 



1 .. ngth .1 8 inch. 



< tecUTS in the ( rulf State-. 



AMKRI. PH1L08O. sec. — VOL. XIV.— 



