82 THE ZOOLOGIST. 
culpturings according to his views. His remarks may be concisely rendered 
as follows :—There are three principal types of markings: (1) Where the 
stones are covered with chlorophyllous Alge, serpentine furrows, the work 
of larvee of Tinodes, occur. (2) Where the stones are covered with incrusting 
Alge the markings are more numerous and meandiform, and due, as he 
considered, to the permanent pathways made amongst the Algz by insect 
larve, worms, mollusks, &c., intensified by the carbonic acid expired by the 
animals. (3) Grooves caused by the larve of Chironomus. 
Professor Westwood exhibited a series of drawings illustrating the 
economy and transformations of several species of Trichopterous and other 
Neuropterous insects, of which he gave an account; also drawings of a 
number of new and interesting exotic species of Heteropterous Hemiptera, 
allied to the genera Syrtis, Emesa, Rhyparochromus, &c., contained in the 
Hopeian Collection, full descriptions of which he proposed shortly to com- 
municate to the Society for publication. 
Prof. Westwood next called the attention of the Members of the Society 
to the present condition and future prospects of the Hopeian Collection of 
Entomology in the University of Oxford, and of the Hopeian Professorship 
of Zoology connected therewith, considering that it was very desirable that, 
at his advanced age, entomologists should, in the interest of their science, 
be made fully acquainted with the extent of the Hopeian Collection, the 
regulations connected with the Professorship, and the modification which 
has been proposed by the Oxford University Commission, now sitting, 
which, in his opinion, would materially modify, and to a certain extent 
render nugatory, the intentions of the founder of the Professorship and 
donor of the Collection. 
Prof. Westwood then made some remarks on the affinities of the genus 
Polyctenes, Westw. (Thes. Ent. plates 38, 39 and 40), which Mr. C. O. 
Waterhouse at the last meeting of the Society had regarded as closely 
allied to the Nycteribiide, and especially to the genus Strebla. 
Mr. J. Jenner Weir exhibited some ants, apparently a species of Atta, 
which he had found in large numbers at Pisa on the lawn around the 
Baptistry and Cathedral. These ants did not make any hill of earth about 
their nests, but collected around the entrance hundreds of small empty 
shells of Helia caperata and H. virgata. He was unable to offer any 
opinion as to the object of these singular collections. The shells were so 
numerous and lay so closely together, that he could easily take them up by 
scores at a time. 
Mr. Weir also exhibited a specimen of an Orgyia (? antiqua), stated, on 
the authority of Mr. H. 8. B. Gates, to have come out of the larval skin 
without passing through the pupal state. 
The Secretary then read a note from Mr. W. L. Distant on some 
Hemiptera from India. 
