22 DR. BRACKENRIDGE CLEMENS' LETTERS. 



know of any work which you think will be valuable to me, 

 and will extend my knowledge of genera, by giving me the 

 title you will add another to the many obligations I feel 



under to you for past kindness and encouragement. 



# * * * * *#* 



I determined long since to form no collection for myself, 

 and freely give away all specimens I have systematized. 

 Such specimens as are new I add to the collection of the 

 Acad, of Nat. Sciences in Philadelphia, where any one may 

 find them. 



V. 



Easton, Pennsylvania, United States, 

 October ith, 1859. 



I beg you to accept the contents of the accompanying box. 

 I collected the cocoons especially for you a day or two since, 

 and they are all full fed on their food plants, not in vivaria. 

 I intended to send this with my next letter to you, but as a 

 steamer leaves on the 5th inst., I will defer writing until 

 I can send also a copy of my paper on the Sphingina, and 

 perhaps my first on the Tineina. Then I send some species, 

 which I fear may appear on the voyage to you, and to antici- 

 pate the event if possible I send them immediately. A few 

 specimens of L. Robiniella are at present in then* mines 

 though nearly full fed ; these I hope will become pupae ere 

 you receive them. The cocoonets are separated from each 

 other by thin layers of cotton, and a bit of paper in each lot 

 giving their names. Commencing at the top is a beautiful 

 species that will surprise you. I wish I could enjoy your 

 surprise : Phyllocnistis vitigenella. The rest are members 

 of the genus Litlwcolletis — perhaps not all specifically dis- 

 tinct — except some Antispila nysscefoUella. 



With respect to this and an allied new genus I have some- 

 thing of interest to tell you. The mine of Phyllocnistis is 

 not correctly described in the " Insecta Britannica," unless 

 the mines of your species differ considerably from ours. 

 The larva is apod. Particulars hereafter. 



