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Show 1887.] DR. WINDLE ON THE ANATOMY OF HYDROMYS. 53 hibited for the first time; and all the pupae, with the exception of those of Papilio demoleus, were brought home by Mrs. Monteiro. Of American Diurnal Lepidoptera, Papilio ajax and Papilio turnus were exhibited for the first time. Amongst other insects that I obtained last year were a large number of the cocoons of, I believe, Thyridopteryx ephemeriformis. From these cocoons many male insects emerged and copulated with the females, which do not leave the cocoon, and the result was that some hundreds of young larvae were produced. Of these only one survives, and I exhibit it this evening, in its curious covering. It has been reared upon young oak, raised from acorns. When the male insects first emerge from the cocoon, their wings are covered with a brownish hair, which makes them quite opaque, but on the slightest movement of the wings this at once disappears. A full description, together with figures, of this insect will be found in the First Annual Report of the U.S. States Entomologist, p. 147, by Mr. Charles V. Riley. As it is placed amongst the noxious insects by that gentleman, it is perhaps as well, in this case, that I did not succeed in rearing more than one of the larvse. In conclusion, I take this opportunity of thanking Mr. W . H. Edwards, of Coalburg, West Virginia, through whose kind assistance and interest I have been able to obtain many species of American insects. The following papers were read :- 1. On the Anatomy of Hydromys chrysogaster. By BERTRAM C. A. W I N D L E , M.A., M.D. (Dubl.), Professor of Anatomy in the Queen's College, Birmingham. (Communicated by Dr. MIVART.) [Received December 20, 1886.] The following notes are the result of an examination of a specimen of the above-named animal, obtained shortly after its death. External Appearance. Measurements (in centimetres). Length from snout to tail 66'° of tail • 29'0 of head <'° Distance from snout to eye 3-3 „ eye to ear ? 1 Length of humerus 3-6 forearm 4 z femur, from apex of great trochanter 5"0 " leg • 6"3 hand, to apex of claw of medius 3*5 )> |