3032 THE ZooLocist—Aprit, 1872. 
1871, Nos. 1 and 2; presented by the Society. ‘The Journal of the 
Quekett Microscopical Club,’ No. 17; by the Club. ‘ Recherches expéri- 
mentales sur la position du centre de gravité chez les Insectes, par M. Félix 
Plateau’; by the Author. 
Echibitions, &c. 
Mr. F. Smith called attention to the fact that mice are in the habit of 
devouring the dead pupz of Bombyx mori contained in what is known as 
‘silk-waste,’ viz., the inner cocoon remaining after the external silken 
envelope had been wound off. This had been brought to his notice by one 
of his sons as occurring in a London silk-warehouse, and a parcel of the 
said ‘waste’ brought to him afforded an instance of a double cocoon, or, 
rather, a very large cocoon containing two pupe lying free within it, and 
evidently constructed by two larvee working in concert. 
Mr. F. Moore said the cocoons were those of Bombyx mori from China. 
Double cocoons were not of infrequent occurrence; and occasioned some 
additional trouble in the winding process. Mr. Jenner Weir alluded to the 
occurrence of double cocoons of Eriogaster lanestris; and Mr. Miiller 
remarked on an analogous occurrence among species of sawflies, though this 
was scarcely a parallel instance, inasmuch as the sawfly larva merely used 
one side of an already constructed cocoon as a foundation for its own, and 
did not act in concert with its fellows. 
Mr. Butler exhibited drawings (and a dried specimen) of parasitic larve 
that had emerged from the bodies of caterpillars of Pygeera bucephala, which 
they almost equalled in size. He had not been able to determine the insect 
to which the larve belonged, as these latter died after spinning a quantity of 
threads, partly black, partly white, on the surface of the earth in the vessel 
in which they were placed. It was suggested that they probably pertained 
to some large species of the family Ichneumonide. 
Dr. F. Buchanan White communicated the following extracts from his 
note-book respecting the habits of a species of ant in Italy, bearing upon 
Mr. Moggridge’s remarks on the storing of seeds by ants at Mentone, as 
noticed by Mr. F. Smith at the meeting on the Ist of January (See Proc. 
Ent. Soc., 1871, p. xlvii.):— 
“ Capri, June 3, 1866. In the afternoon to the Punta Tragara, where a 
colony of ants afforded us much amusement. These little insects had a 
regular road, made by cutting away the grass and other plants in their way. 
This road was about one inch and a half wide and several yards long, and 
led to a large clump of plants in seed. Along this road a long train of 
ants were perpetually travelling to the nest (or formicarium), bearing with 
them pods of Leguminous plants, seeds of grass and of Composite (Chrysan- 
themum segetum), &c. The perseverance with which a single ant would tug 
and draw a pod four times his own length was very interesting; sometimes 
