73 DESCRIPTION OP INSECTS 



Carabus unicolor aptere ; bords du corcelet arrondis, releves ; corps noir ; ely- 

 tres stiiees. Oliv. Ent. No. 35, p. 47. pi 6. fig. 62. 



Head black slightly tinged with blue ; anteniiK brown at tip. 

 Thorax blackish-blue, Jateral margins reflected, disk a little 

 convex and witli an impressed line, lateral margins widely 

 reflected, widest rather before the middle, and narrowed 

 behind, posterior angles rounded. 

 Elijtra l)right cupreous-red or purplish, with numerous strise 

 in which are large, dilated, and confluent punctures, be- 

 neath black. 



The descriptions of the unicolor by Fabricius, Olivier, and 

 others do not satisfactorily correspond with our insect, inas- 

 much as the whole body is stated to be black. They also 

 state, but perhaps through error, that its native country is 

 South America. 



This fine species is rare in Pennsylvania, and I have seen 

 but a single specimen of it, which was presented to me by 

 Mr. William Hyde of this city ; it was caught on the bank of 

 the Susquehanna river. 



The form of the thorax in Olivier's figure, above quoted, 

 is incorrect in having its greatest diameter placed much too 

 far backward. 



3. C. *stenostomus black ; elytra dark cupreous, margins not 



reflected ; basal thoracic hues distinct. 

 Length half an inch. 



Cychrus stenostomus. Melsh. Catal. 



Head black, glabrous, impunctured ; antennie brownish to- 

 wards their tips. 



Thorax black tinged with blue, rounded, widest in the mid- 

 dle, contracted behind, margin not reflected, base narrower 

 than the elytra, punctured, basal edge rectilinear, dorsal 

 line very distinct, basal lines profound, impressed, obtuse, 

 and punctured. 



Elytra bronzed or dark cupreous, strife numerous, obtuse, 

 interstitial lines narrower than the striae, obtuse, edge 



