AMERICAN PHILOSOPHICAL SOCIETY. 523 



7. C. PURPUREA Oliv. Ins. 83, pi. 3, f. 34. Say, Trans. Amer. 

 Philos. Soc. 1818, p. 419. C. marginaUs Fabr. Syst. Eleut. 1, 

 240, and Dejean, Sp. Gen. 1, 55. Olivier has certainly the pri- 

 ority, and consequently the exclusive right as being the first de- 

 scriber of this species. [411] 



8. C. SEXGUTTATA Fabr. — Dejean has ascertained autoptically 

 that C. violacea Fabr. is the immaculate variety of this species. 



9. C. 12-GUTTATA Dej. — I obtained a specimen in Missouri 

 State. 



Of this genus I have in my cabinet twenty-two species, natives 

 of the United States, that have been described. 



ARETHAREA Say. 



Artificial character. — Elytra truncated; terminal joint of the 

 maxillary palpi acicular; anterior tibiae simple. 



Natural Character. — Head large, wider than the thorax, con- 

 tracted behind at the junction with the thorax; antennae origi- 

 nating beneath a carina, with the first joint much shorter than 

 the head; labruin short, bilobated ; the lobes divaricated ; margin 

 hairy ; mandibles very prominent, arquated, acute ; within promi- 

 nently and acutely denticulated ; maxillae rectilinear with rigid 

 hairs within; palpi with the penultimate joint dilated ; ultimate 

 joint acicular and minute ; labium at tip with two equal mem- 

 branaceous lobes and a lateral robust seta; palpi very small and 

 feeble, terminal joint somewhat shorter and more slender than 

 the preceding one ; mentum transverse, simple ; destitute of 

 auricles ; thorax cylindrical ; truncate before and behind ; elytra 

 broadly truncate at tip ; tibiae, anterior pair simple ; tarsi with 

 subequal simple joints; the basal ones slightly longest; nails un- 

 armed; posterior pair of feet with the nails pectinated. 



Obs. The prominent, arquated and denticulated mandibles of 

 this curious insect resemble, with some accuracy, those of Cicin- 

 dela ; but the general appearance and extraordinary assemblage 

 of characters widely separate it. It has the truncated elytra of 

 Lehia and its congeners ; the simple anterior tibije of Cicindela ; 

 and a singular character that seems to connect the two families, 

 that of having the anterior pair of nails simple and the posterior 

 pair pectinated. We may also remark, however, that the acicu- 

 1834.] 



