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the tooth and emargination which characterize the elytra in the 

 female of the Missouri species. The thorax of the latter ap- 

 proaches to the cylindrical or barrel shape that it takes in other 

 groups, departing (gradually, however) from the quadrate 

 form with elevated posterior angles, which is found in dorsalis 

 and marginata^ and agreeing in this character with hlanda 

 and lejnda. I have not a male of blanda, and therefore have 

 not seen whether it has the posterior tooth of the mandi- 

 ble ; but infer from other circumstances that the tooth is want- 

 ing. It seems very singular that a species so near to our 

 maritime 0. dorsalis and marginata should be found in Mis- 

 souri, and I would be glad to know whether the Missouri 

 species lives on the banks of streams, or other wet places. ^ I 

 have taken marginata on the muddy banks of salt water creeks, 

 amongst the grass to the water's edge. My Cambridge speci- 

 mens are more dull in color than those I have from Florida, 

 and the white markings of tlie elytra are often obsolete. They 

 are likewise generally larger than southern specimens. The 

 only part of Massachusetts where G. dorsalis has hitlierto been 

 found is the shore of Martha's Vineyard, where also C. patru- 

 ela has been found. The latter occurs on the shores of Lake 

 Champlain, in Burlington, Vt., but I have seen it from no other 

 part of New England. C. generosa and rugifrons were for- 

 merly abundant on the sands beyond Mount Auburn, about one 

 and a half miles from my residence ; they are now almost ban- 

 ished from the place by the cutting of a railway, and a little 

 settlement which has grown up in that place. They may still 

 be found on Lynn beach, and some other of our sea-beaches, 

 where only have I met with O. hirticollis (alhohirta Dej.). 



1 The species here referred to is C. cuprascens Lee. and is quite common on the 

 banks of the -western tributaries of the Mississippi and Missouri. [J. L. L.] 



