PROCEEDINGS OF SCIENTIFIC SOCIETIES. 349 
the interest of the travelling naturalist in the highest degree. Although 
the accordant changes were generally complete, cases occurred in which 
intermediate varieties were still extant, and the study of these had given 
him, when he was in South America, the clue to an explanation which, 
however, does not embrace the whole of the problem. 
July 2, 1879.--Sir Joun Lupgock, Bart., M.P., V.-P.R.S., President, 
in the chair. 
Donations to the Library were announced, and thanks voted to donors. 
Mr. Vincent Robert Perkins, of 54, Gloucester Street, South Belgravia, 
was ballotted for and clected an ordinary Member. 
Mr. S. Stevens exhibited living specimens of Tillus unifasciatus and 
Teretrius picipes, from the same fence, at Norwood, where these insects were 
captured last year, this being the fourth season of capturing the first, and 
the third season of taking the second species in this locality. (See also 
Proc. Ent. Soc., 1878, p. xli). 
Mr. M‘Lachlan made a further communication respecting the sculptured 
pebbles from Lac Leman. He had received from Prof. Forel an actual 
water-worn limestone pebble from the lake, which did not, however, show 
any distinct sculpturing, but on it were the covered channels formed by 
Trichopterous larve. A number of the perfect insects forwarded (with 
larvee and pupe) by Prof. Forel proved to be Tinodes lurida, Curt., a 
common insect generally on the margins of lakes and rivers. 
Mr. W. L. Distant exhibited a specimen of Papilio Hystaspes, Feld., 
taken by Mr. R. E. Cole at sea during a calm, thirty miles from Singapore 
and nine miles from the nearest land. This butterfly, found both at the 
Philippine Isles and Malacca, is generally considered as a variety or local 
race of Papilio Helenus, Linn., round which are also grouped a number of 
other closely allied forms. Mr. Distant suggested that if, as in this case, 
one of these forms could be found so far at sea during a calm, it could easily 
be realized how in such a region of sudden storms involuntary migration 
must frequently take place, and the differences in the conditions of the new 
habitats might be sufficient to produce the many constant but varietal 
forms of this species. 
Mr. William Cole exhibited a remarkable variety of Pyrameis cardut, 
taken at Buckhurst Hill, Essex, in June. 
The Secretary exhibited, on the part of Lord Walsingham, some 
specimens of a species of Tipulidee (Bittacomorpha elavipes, Fabr.), remark- 
able for possessing greatly enlarged tarsal joints, captured at Pitt River, 
California. 
Sir Sidney Saunders communicated some additional explanation, 
received from M. Jules Lichtenstein, of Montpellier, respecting the rearing 
of the blister-beetle, Cantharis vesicatoria.—R. Mrxipvoxa, Hon. Secretary. 
