52 



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 : "Ou la majeure 

 partie des antennes est en forme de scie.*' In my 874 the an- 

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

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

 rus is the name of a genus established by Latreille, I know 

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

 naturelle thus : " Tarses de 5 articles distinctcs ; antennes forte- 

 ment en scie, depuis le 5 me article inclusivement ; le dernier des 

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

 cedens, cylindrique ; le meme dans les labiaux en forme de cone 

 renverse et allonge ; mandibules longues et croisees ; t^te allongee, 

 corps long ct cylindrique, Ce genre se compose, d'une seule 

 espece, Tricliodes cyaneus, Fair" 



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

 another species marked in my catalogue 860, where the antennas 

 are " en scie depuis le 5 article inclusivement" and this closely 

 related in every other particular to 874 ; only the mandibles 

 seem to be longer, 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, but 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 Ta-pheicerus seems different from my 133. 

 The groove is not so deep in front, it is true, as a.t 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 of 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 



