OF WASHINGTON. 167 



thick ; fifth elytral interval not elevated ; tarsi with long, sparse 



swimming hairs velatus. 



Thorax at base much wider than long, sides strongly convergent anteri 

 orly, posterior tubercles large and acute ; beak slender ; fifth elytral 

 interval elevated at base ; tarsi without swimming hairs. griseomicans. 



Referring to the cocoon of Phytobius previously mentioned 

 by Mr. Schwarz, and also of other Coleoptera, Prof. Riley said 

 that lie would restrict the definition of " cocoon." He thought 

 this term should not be applied to cells formed by the hollow 

 ing out of plant substances, such as the bud, stalk or crown 

 of plants, or to cells made in the earth. The word cocoon he 

 thought, should signify a structure, i. e., something actually 

 built up, either of silk, or some glutinous substance, or of 

 welded or interwoven matter of any other kind. The others 

 could be more properly termed cells or cradles. 



Mr. Schwarz presented the following note : 



A CORRECTION. 



BY K. A. SCHWARZ. 



On a former occasion (see Vol. I, pp. 163, 164), I referred a 

 species of Pityophthorus bred from L,iquidambar twigs to P. 

 annectens L,ec. Having subsequently procured males of the 

 latter species I see now that I was mistaken in my determina 

 tion, and that P. annectens is quite different from the species 

 boring in lyiquidambar. The latter is identical with what I 

 consider to be P. consimilis, which is also known to live in 

 various species of Sumac. The females of the two species 

 resemble each other so closely that they can hardly be dis 

 tinguished, but the males are readily distinguished by the 

 nature of the pubescence of the head. In the male of P. 

 annectens the pubescence is yellow, very long, forming a circu 

 lar fringe and usually concealing the sculpture of the head. 

 In the male of P. consimilis the pubescence is much shorter, of 

 grayish color, sparse anteriorly and more brush-like on the 

 posterior part of the head. I have very little doubt that even 

 Dr. L,eConte in his letter addressed to Dr. Packard (see Bull. 

 No. 7, U. S. Knt. Comm., pp. 260, 261) has also confounded 

 the females of the two species, and fully believe now that P. 

 annectens will prove to live exclusively on Pinus palustris and 

 allied species of the same genus. 



The genus Pityophthorus is, in our fauna, the largest as well 

 as the most difficult genus of Scolytids. The species having 



