62 



HENTZ TO HARRIS. 



Chapel Hill, N. C, Jan. 19, 1829. 



Your letter, dated Jan. 16, arrived this morning, and gave me 

 great pleasure. Latreille says about Tillus : "Ow la majeure 

 pariie des antennes est en forme de scie."' In my 874 the an- 

 tennae are filiform, the last joint only being large and fusiform. 

 That is the reason why I did not place it in that genus. Cylid- 

 rtis is the name of a genus estaljlished by Latreille, I know 

 not in what work, given in the Dictionnaire classique d'histoire 

 naturelle thus : ' ' Tarses de 5 articles distinctes ; anten7ies forte- 

 ment en seie, depute le S""" article inclusivement ; le dernier des 

 palpes tres long; celui des maxillaires de la grosseur des pre- 

 cedens, cglindrique ; le meme dans les lahiaux en forme de cone 

 renverse et allonge ; mandihules longues et croisees ; tete allongee, 

 corps long et cylindrique. Ce genre se compose d'une seule 

 espece, Trichodes cganeus, Fabr.'^ 



The antennae of my insect, it is true, do not agree, but I have 

 another species marked in my catalogue 860, where the antennae 

 are " en scic dermis le 5"'" article inclusivement" and this closely 

 related in every other particular to 874 ; only the mandibles 

 seem to be lon<xer, which would be an additional character 

 to place it in Cylidrus. I say " seem to be longer," because this 

 being a unique, I have not dissected it, UVit the mandibles 

 are certainly crossed. I am still in doubt about these two in- 

 sects, and shall be glad to receive your farther suggestions 

 about them. Your Tapheicerus seems different from my 133. 

 The groove is not so deep in front, it is true, as at base; 

 but when you turn the head towards you the outline of the 

 thorax presents a perfect bow. On the subject of the Cicindela 

 of Pennsylvania, I will extract the following from my journal : 

 "No. 3. This can scarcely be the decemnotata o^ Say. The 

 front is not hairy, the bilobate disk of the thorax not cupreous, 

 the scutel not blue ; elytra green all over. The refracted band 



