^‘^’Syst. Eleut. 1, 240 and Dejean Sp. 
Gen. 1, Olivier has certainly the 
priority, aikl consequently the exclu- 
sive right as the . first /lescriber 
of this species. 
C . aexguitata^ F abr. ID ej eah has 
ascertained aiitcptically tbiat C. vio- 
/ace« Fabr, . is the immaculate vai”le“ 
ty of this species. 
,C. 12-^gutcatat Dej. I obtained a 
specimen .in Missouri state. 
Of this genus I have in my cabinet 
twenty-tiYO species, natives of the 
United States,, that have been de- 
scribed, 
ARETHAREA. Say. 
Artificial Character. 
Elytra truncated; terminal joint of 
the maxilary palphadcular 3 .ahterior 
tibi^ simple. 
Natural Character. 
Head large, wider than the thorax, 
contracted behind at the jimctio 
\ with the thorax ; originating 
beneath acarina, with the first joint 
much shorier than the headi lahrum 
short, bilbbated; the lobes divaricated; 
margin hairyj 7iiandiblesyQVY promi- 
nent, arquated, acute ; within promi- 
nently and acutely denticulated : 
maxillae rectilinear with rigid hairs 
within ; palpi with the penultimate 
joint dilated; ultimate joint acicular & 
minute: labium at tip with two equal 
membranaceous lobes & a lateral ro- 
bust seta; pa' pi very small and feeble, 
terminal joint somewhat shorter 6c 
more slender than the preceding one : 
mentum transverse, simple ; destitute 
of aviricies : thorax cylindrical ;trun- 
V cate before and behind: elytra broadly 
tnincate at tip : tibiaet anterior pair 
;;„simple ; tarsi with subequal simple 
joints ; the basal one slightly longest, 
nails imamed: posterior pair of feet 
with the nails pectinated. 
Of-m-rvatiom. 
The prominent, arquated and den- 
ticulated mandibles of this curious in- 
sect, resemble with some accuracy, 
these of Cicindela ; but the general 
appearanceand extraerdiniMy assem- 
blage of characters »?idely separate 
it. It has the truncated elytra of 
Lebia und .its coiigeiieiii ; the simple 
anterior tibae of Cicmdela and a 
singular character that seems to con- 
nect the tv7o families, that of having 
the anterloi’ pair of nails simple and 
the posterior pair pettinatecl. We 
may also remark, however, that the 
acicular terminal joint of the maxilla- 
ry palpi is a trait in Common with Ben- 
bidium. Bon. 
A. hellmniSf Head black ; thorax 
rufous ; elytra blue. 
Inhab. Peimsylv. 
Head punctured, somewhat hairy ; 
eye^ small, almost equidistant be- 
tween the tip of the mandibles and 
the thorax; antennae first and second 
joints pale rufous : lahrum yellowish 
rufous ; mandibles piceous: palpi pale 
yellowish rufous : thorax punctured* 
excepting along the dorsal middle ; 
elytra destitute of striae or punctures, 
blue with a purplish reflection : feet 
and postpectus pale yellowish ; knees 
arid tarsi brownish. 
Length three-tenths of an inch. 
‘The intermediate feet and the an- 
tenna excepting the first and second 
joints are deficient in the specimen. — 
lam not sure whether I obtained it 
on our journey to the Rocky Moun- 
tains, to St. Peter’s river, or in Penn- 
sylvania, but I think the latter. 
