PROC. ENT. SOC. WASH., VOL. 21, NO. 8, NOV., 1919 



(sex undeterminable), collected June 19, 1907, and April '22, 

 1908, by F. C. Pratt. 



Type. Cat. No. 22385, U. S. Nat. Mus. 



This species is very closely allied to T. gibbosa Say, but is dis- 

 tinguished from that species by having the whitish recumbent 

 hairs on the elytra forming a more transverse band and n ot 

 extending obliquely to the humeral angles, nor forming a dark 

 semi-circular area back of the scutellum which contrasts strongly 

 with the adjacent densely clothed portions. The four tufts of 

 dark brown hairs on the prothorax are of equal size while in 

 gibbosa the anterior pair is quite small. 



Ptilineurus marmoratus Reitter. 



In working over the material a series of specimens were found 

 labelled "Hedobia sp." which are the above Japanese species. 

 Fall referred to this series of specimens in his "Revision of the 

 Ptinidae of Boreal America" (1905, Trans. Amer. Ent. vSoc. 

 XXXI, p. 129), as belonging to the tribe Hedobiini and having 

 been reared from Japanese bamboo, but in looking up the original 

 notes in the Bureau of Entomology files, it was found that they 

 were infesting the wood of different species of trees and not bam- 

 boo as mentioned by Fall. The following unpublished notes in 

 the Bureau of Entomology files were made by E- A. Schwarz, 

 July 24, 1883: "I found that the Japanese representation of 

 the trees exhibited in the National Museum were badly infested 

 by a Ptinid beetle. These representations of trees consist of a 

 plate of wood upon which the leaves, blossoms and fruit are 

 painted and which is surrounded by a framework composed of 

 the wood of the same tree itself showing at the corners cross 

 sections of the twigs and on the sides longitudinal sections, but 

 the insects had in many instances also attacked the cross sec- 

 tions, boring into the wood itself. In most cases they burrowed 

 under the bark. Only a few living specimens of the beetles were 

 seen as the cases are not tight enough to prevent their escape and 

 a close investigation of the frames was impossible without de- 

 stroying their scientific value. Larvae were found which do not 

 differ in shape from other Ptinid larvae. Upon lifting up smaller 

 pieces of the bark it was found that the larvae spin a cocoon of 

 fine, white silk, which is fastened in a kind of a shallow cell in 

 the under side of the bark, the cocoons greatly resembling in 

 appearance that of a Microgaster, being only a little less cylin- 

 drical and wider at the middle. Anthremis larvae were feeding 

 upon the cocoons and the dead adults. The species appears to 

 have invaded most of the frames without regard to the species 



