OF WASHINGTON. 41 
\ 
points, resembled that in the Sphingidae, and Prof. Riley mentioned that 
in Aletia xylina there were similar, yet still undescribed organs. In many 
of the genera of the Deltoids the feet tuftings assume remarkable and start- 
ling forms, and quite a number of these have been studied, and will form 
a chapter strongly confirmatory of the views advanced in this article. 
Mr. Mann remarked upon the interesting character of the com- 
munication, and the value of such a summing up of the subject 
as that by Fritz Miiller, which formed the basis of Dalla Torre's 
paper. He called attention to the observations made upon the 
subject in this country, and to the citations of literature which had 
been given in PSYCHE. He said he had observed the protrusion 
of the tufted appendages at the tip of the dorsal surface of the 
abdomen by the living insect in Brazil, and noticed the strong 
odor proceeding from these appendages. The species upon which 
the observation was made seems to be Heliconius phyllis. Not 
having his collection at hand he could not be certain of the species 
further than to say that if there exists any other common species 
in Brazil closely similar to H. phyllis he cannot make the dis- 
tinction from recollection ; otherwise the determination is good. 
Mr. Mann expressed his doubts whether any muscular action 
could take place on the surface of the wings of Lepidoptera, such 
as to erect or move the scales individually, or any physiological 
process go on to replenish the scent scales after their odor had 
been dissipated. 
Mr. Schwarz added that among the many forms of secondary 
sexual characters in Coleoptera some would likely be found to 
be analogous in function to the odoriferous apparatus just described. 
He referred more particularly to the tuft of hair on the mentum 
in the males of Trogosita, and those on the ventral segments in 
the males of Dermestes. Differences in the character of the ves- 
titure in the two sexes are known to occur in Coleoptera ; e. g., 
the genus Hoplia, but in this instance it is hardly possible that we 
have to deal w r ith odoriferous organs. 
MARCH 4, 1886. 
Eight persons present. President Howard in the chair. 
Mr. Howard exhibited specimens of the so-called Jumping gall 
produced by Cynips saltatorius, and of an interesting Chalcid 
