75 



trees. On ' the contrary, Scar, relictus Say, inhabits heaps of 

 dung accumulated in our cow-yards, etc., whence I have ob- 

 tained and bred the larvas. I suspect, also, that my small 

 species allied to it, as also others in my cabinet, viz., S. triden- 

 tatus Say, S. gibbosus De Geer, and a still smaller species, will 

 be discovered in stercoraceous situations. My specimens were 

 found in roads frequently traversed by dung-carts. This differ- 

 ence of habit will lead to a subdivision of Scaraboeus, if close 

 examination should show any difference in structure, which 

 we might naturally expect. 



Respecting No. 96, Callistus ? pallipes Fabr., I would make 

 some remarks in answer to your queries. I believe it to be the 

 Carabus pallipes of Olivier and Fabricius, and in this, Prof. 

 Say, to whom I sent the insect with this name, coincided. 

 Fabricius described a German insect, also by the name pallipes, 

 but afterwards changed the name (see his Index and Schon- 

 herr, I, p. 190, No. 116) to albipes. Without thinking of the 

 old name for the German insect, and without considering the 

 brief characters given for Callistus, when I saw the pallipes 

 Fabr., enumerated among the Callisti in the " Regne Animal," 

 I concluded, of course, that it was intended for our American 

 insect. On reexamining the " Regne Animal," I find that 

 Panzer 78, 7 is quoted as synonymous with the pallipes which 

 proves that Latreille meant the German insect. You have sent 

 me four Carolinian insects congeneric with my 96 [= Feronia 

 pallipes Fabr., Harr. MSS. Catal.]. First (587, my cabinet) 

 [= Feronia pallipes Say, var., Harr. MSS. Catal.], though consid- 

 erably larger, is probably an overgrown specimen of our very 

 abundant pallipes; second (586, my cab.) [= Feronia lineola 

 Fabr., Harr. MSS. Catal.], I suppose to be lineola; it has two 

 conspicuous black spots on the thorax; third (906, my cab.), 

 your 49, which I call limbata Say ; and fourth (my 906 bis), 

 rather smaller than limbata, but most likely a variety only. 



An excellent natural character by which you may distinguish 

 Colymbetes from Dytiscus (if you have not the males) is that 



