XXX 



Mr. M'Lachlan made a further communication respecting the sculptured 

 pebbles from Lac Lemau. 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 larvae. A number of the perfect insects forwarded (with 

 larv» and pupas) 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 Islands and Malacca, is generally considered as a variety or local 

 race of Papilio Helenus, Linn., round which are also grouped a number of 

 otiier 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 cardul, 

 taken at Buckhurst Hill, Essex, in June. 



The Secretary exhibited, on the part of Lord Walsingham, some speci- 

 mens of a species of Tipulidae [Bittacomorpha clavijJes, Fabr.), remarkable for 

 possessing greatly enlarged tarsal joints, captured at Pitt River, California. 



Sir Sidney Saunders communicated the following additional explanation, 

 received from M. Jules Lichtenstein, of Montpellier, respecting the rearing 

 of the blister-beetle, Cantharis vesicatoria : — 



"(1). L'espece de Ceratina qui m'a servi a lelevage, est la grande 

 C. chalcites de Germar = egregia de Gerstaker. Elle niche dans les tiges 

 seches de sureau (Samhucus ebulus, L.). 



"(2). La larve qui succede a la pseudo-nymphe («) rejette completement 

 la peau de la pseudo-nymphe ib); ce qui la distingue des ' Sitaris' et 

 ' Zonitis,' qui gardent la peau de pseudo-nymphe (c) completement, et de 

 ' Melo'e,'' qui la garde a moitie. Vous avez parfaiteraent raison dans voire 

 appreciation de cet etat. C'est une phase de la transformation de la pseudo- 

 nymphe {d)-''- en vraie nymphe. 



" Je vous reponds de suite pour que vous puissiez douner ces renseigne- 

 ments a nos collegues de 2 Juillet." 



Note. — M. Lichtenstein further explains, in a communication to the 

 Academic des Sciences (' Comptes Rendus,' No. 21, 19 Mai, 1879), that 

 the Ceratina is not the ordinary victim of the Cantltaris, which, he suggests, 

 is probably usually reared in the cells of bees burrowing in the ground, 

 such as the Halicti, Andrence, &c., stating also the means which he adopted 

 * (a, b, c, d) " J'seudo-chrysalidu," i'abre. 



