











390 PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
typical form of the genus. This is so marked, that the experienced 
æ 
o their geographical distribution, as every working naturalist x 
poh admits constantly in his studies. 
Mr. Roberts exhibited fine specimens of Anodonta fluviatilis Diw, aid 
A. implicata pe collected in the vicinity of Philadelphia, noted for oru a 
enormous size as well as for their numerous deformities, caused 
edly by some siesena of their locality. Out of a large number ol 
mens of the genus obtained, but one specimen of Anodonta Tryonii 
was found, showing its great rarity in the vicinity of the original 
Boston Society or Naturat History. Feb. 
not larger than house Mites. The first winged specimens were 8 
in ‘the air at about three o'clock in the afterngon; as a light n 
breeze sprang up, millions came whirling down to the earth, co oe: 
ground in an hour, and destroying every green thing with av ! 
nced t , 
three o’clock in the afternoon of the same day another swarm 4 
times as numerous as the first; these again took flight the follo j 
and thus they continued, coming and going, day after day, dev 
foliage and depositing their eggs. At first they selected bare P 
this purpose, but finally the whole surface of the earth was 50 broken 
by their borings, that every inch of ground cate several 
eggs. This visitation was spread over many hundre ds of miles. 
Mr. S. H. Scudder exhibited two fossil insects from the coal 
One v 
ris, Illinois; the other an imperfect leg of a cricket, and a 
of Behring s straits with those of Esquimaux and of In 
` Puget’s Sound, and California. The crania of the Tsuktshi 
for the Smithsonian Institution by Mr. William H. Dall, 
ralist attached to the e exploring expedition under 
Western Union Telegraph Company. It appears that the 
Tsuktshi and Esquimaux, which closely resemble eg 
— y marked Mongolian features, oy 
 erania of the other races and from those nts the 

