OF THE UNITED STATES. |il| 



by the late J. K. Townsend, and by the Exploring Expedition under Capt. Wilkes. Al- 

 though by the impressions of the elytra it seems related to Elaphrus, and by the form of 

 the thorax to Bembidium, its true affinities arc undoubtedly with the present group, on 

 account of the form of the pro- and mesosternum, and the imperfection of the anterior 

 acetabula. It seems to be the true osculant between the Carabica and the water beetles, 

 through Amphizoa: Omophron, though somewhat aquatic in it- form and habits, has, 

 wc shall hereafter sec, no claims to be considered an osculant genus. 



\ . Elaphri. 



The characters of this group, in the scries having the parapleural withoul an appendage, 

 consist in the anterior acetabula being entire, the prosternum nol prolong* d posteriorly, and 

 the maxillae towards the base being armed with several long bristles, or Bpin< s. This 

 character exists also in some of the genera of the preceding group: such arc. howi v< r, 

 readily separated by the form of the anterior acetabula. 



Tin rnum is declivous, and usually slightly concave: the anterior tibiae are more 

 or less emarginate internally . one of the spurs being placed al the tip and the other a Bhort 

 distance above: the paraglossae are distinct; the firsl lour joints of the antennae are gla- 

 brous. The first three joints of the anterior tarsi of the males arc dilated and S] g) 



beneath. 



On account of the structure of the epimera of the mesothorax, and the absence of any 

 appendage to the parapleural, I have placed Loricera in this group: it- strongrj bearded 

 maxilla; show its affinity with these insects, nor can 1 conceive how n has ever been con- 

 sidered as related to Chlsenius, or to Panagssus. 



Our genera may be thus arrange d. 



niue vcrticillato-setosac; mentum dente lato, olt - - Loricera Latr. 



Antennae impliccs; mentum dente longo cmarginato: 



Ipi maxillarcs articulo ultimo prsocedente vix sesqui longio /■' . 



Palpi maxillares articulo ultimo praecedente plus duplo longiore I phn / 



The genera Opisthius and Notiophilus have been removed from this group to the pre- 

 ceding, on account of the form of the sternum and anterior acetabula. 



Of Loricera, there arc four species known fioni North America: L.pilicornis bitr. 

 from hake Superior: L. Bemipunc t a t a Esch. and L. fovea ta /• . from < alifornia, 

 and L. dcccmpunctata /.'■• '. from Sitka. 



Of Blethisa, Haldeman has described a vcrj large species, B. quadricollis Pi 

 \ d. Nat Sc. 3, 1 19) found at Lake Superior: I fr. I [arris has found the same 



Cambridge, Mass., but it appears to be very rare. \ species from ( '; , collected bj 



the late J. K. Townsend, has nol yel been describi d . 



B. ' ' r e g on c nsis, sem , thorace latitudin 



rotundatis, reflexis, angulis posticia subrccti in atrinque profande impr 



na munito, elytria profondios Btriato-punctatia, striis extends confosis, int( i vein 



quinq I vcis dualus imprcssis. I. 



One female, given me bj Mr. Willcox. The posterior angles of the thoi light!) 



