PROCEEDINGS OF SCIENTIFIC SOCIETIES. 921 

each-borer, Dicerca divaricata, found flying now about peach and cherry 
trees; Chrysobothris fulvoguttata, and C. Harrisii, about white pines. The 
large weevil, Arrhenodes ries i which lives under the bark of the 
white oak, appears in June and July. The Chinch-bug begins its terrible 
ravages in the wheat-fields. The various species of Chrysopa, or Lace- 
inged flies, appear during this month 

PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
se PN 
DEMY OF NATURAL Sciences. Philadelphia, Feb. 6, 1868. (OConcho- 
Pai Section.) —A paper was read by Dr. James Lewis on the distribution 
of shells in some parts of New York. Mr. W. M. Gabb remarked on shell 
k in Lower California. Dr. Beadle spoke on the great abundance 
of Helix desertorum in the deserts of Sinai. 
March 5.— Dr. E. I. Nolan spoke of the irridescence of Latirus pr rismati- 
cus. This shell, when immersed in water, exhibits a beautiful irridescent 
display of colors, aree predominating, on the entire surface. On micro- 
scopic examination he had found that the surface was everywhere cov- 
ered with an iF tey fine ai of lines, and suggested that the 
expansion of these lines in water might so decrease the spaces between 
m as to cause the rays of light fine g opon the surfaces to be refract- 
a thus producing the irridescence observ 
BOSTON SOCIETY OF NATURAL HISTORY. p stone 1867.— Dr. B. G. 
Wilder made some remarks upon the want of perfect symmetry in the 
leaves of elms and hop-hornbeams. Professor Agassiz brought forward 
European aurochs. By means of specimens exhibited, he pointed out the 
distinctions he had sean in the two skulls, and stated that these differ- 
ences were such as to characterize them clearly as distinct species. Pro- 
Agassiz an. ak ma skull of a species of dolphin new to 
America, discovered upon the coast of Nantucket. The animal was six- 
teen = in len 
27.— Mr. S. H. Scudder exhibited a curious specimen of “ walking- 
stick” found in this vicinity. One of the fore-legs had been lost in early 
life and replaced by a new one less than one quarter the length of the 
other fore-leg. Mr. Trouvelot states that this replacement of the leg can 
only take place previous to the third moult; the leg was almost perfectly 
rmed, although one of the tarsal joints was wanting, and the foot was 
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. Sanborn exhibited 

