description, and therefore send you the name I had attached to 

 my specimen, which is Tenebrio glaber, from its smoothness, in 

 which it differs from all others I have as yet seen. It may be 

 among those mentioned in Melsheimer's Catalogue, and until 

 this can be ascertained the name is given only provisionally. 

 This remark applies also to the name of the Cercmibyx, allied 

 to tornator, of which I found one small specimen on the 

 Asclepias syriacea. It stands in my cabinet as Stenocorus 

 obliquans, from the oblique or rhomboid fascia on the elytra ; 

 it may perhaps be Lamia M-nigra of Melsheimer. The un- 

 armed Onthophagus ( Copris~) I have always taken to be the 

 female of latebrosus. Individuals of the male sex vary consid- 

 erably in the size and projection of the thoracic protuberance. 



HENTZ TO HARKIS. 



NORTHAMPTON, Dec. 4, 1825. 



In the Chremastocheilus I have observed no material differ- 

 ence in regard to the antennae, but the sex you can ascertain 

 by softening the abdomen in warm water. If you are inclined 

 to publish an account of these two very distinct species, you 

 are fully authorized by me to make use of my communication 

 to you, as well as any other remark I may have made on other 

 subjects. The reason why I called the larger species piger is 

 this : the first specimen I found (alive and in perfect health) I 

 observed on dried leaves moving with swiftness and likely to 

 escape me, but when I came near, I perceived that it was not 

 by means of its own powers that it travelled at such a rate, but 

 that it had. taken a new mode of performing its journey, 

 namely, the legs of a little ant, that dragged it peaceably and 

 unopposed by one of its hind legs, an admirable coursier, and 

 an unheard of method of travelling with speed among insects. 

 I never found one actually walking by its own impulses. 



