AMERICAN ENTOMOLOGY. 7 



and behind the insertion of the maxillae; thorax subquadrate, 

 narrower than the head, a longitudinal impressed line, and a trans- 

 verse basal one ; elytra with numerous orbicular, black dots, 

 irregularly placed, sometimes confluent, and are the effect of the 

 absence in those parts of the cinereous hair ; tarsi, tips of the 

 tibia and thighs glabrous. 



Obs. This insect is much smaller than the preceding ones, 

 and the spots of the elytra distinguish it in a remarkable manner. 

 Numerous specimens were brought by Mr. Nuttall from Mis- 

 souri. 



The lower left figure ; the line represents the natural length. 



Lytta sphvericollis. — Specific character. Dark green, 

 tinged with brassy ; thorax rounded, convex. 



L. spJisericoUis nobis, Jour. Acad. Nat. Sci., vol. iii. p. 299. 



Desc. Body glabrous, blackish-green, slightly tinged with 

 brassy ; head punctured ; antennae robust, black, hardly attain- 

 ing the base of the thorax ; joints short, conic, acute at the edge 

 of the tip; second joint rufous, subglobular; eyes oval, not elon- 

 gated; labrum and palpi blackish; thorax subglobular, punc- 

 tured, punctures sparse, not profound; elytra green, slightly 

 tinged with olivaceous and brassy, somewhat rugose ; two, rarely 

 three, obsolete longitudinal lines on the disk, and another near 

 the external margin ; beneath blackish-green. 



Variety, a. Body green, destitute of the brassy tinge. 



Variety, h. Head and thorax black ; elytra bluish. 



Obs. This species is less robust than the preceding, and may 

 be readily distinguished from others by the rounded thorax and 

 very short antennae, the remaining characters of which latter 

 agree with those of the NuttalU. Many specimens were brought 

 from Missouri by Mr. Nuttall. 



In a future volume of this work, we propose to give some ac- 

 count of the American species of this genus, as related to medi- 

 cine. 



The lower right figure ; the line shows the natural length. 



SCARAB^US. Plate IV. 



Generic character. Antennae ten-jointed, the club composed 

 of oblong-oval lamellae, which haVe an almost common insertion; 

 body ovoid, convex ; mandibles with their external edge crenu- 



