1887.] DR. WINDLE ON THE ANATOMY OF HYDROMYS. 53 



hibited for the first time ; and all the pupa?, with the exception of 

 those of Fupilio demo^eus, were brought home by Mrs. ISIonteiro. 



Of American Diurnal Lepidoptera, Papilioajax 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 descri[)tion, 

 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 gentle- 

 man, it is perhaps as well, in this case, that I did not succeed in 

 rearing more than one of the larvae. 



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 Ber- 

 tram C. A. WiNDLE, M.A., M.D. (Dubl.), Professor of 



Anatomy in the Queen^s College, Birmingham. (Com- 

 municated by Dr. Mivart.) 



[Eeceivecl December 20, 18S6.] 



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*0 



of tail 29-0 



„ of head 7'0 



Distance from snout to eye 3*3 



,, ,, eye to ear 2"1 



Length of humerus 3'6 



„ forearm 4*2 



„ femur, from apex of great trochanter 5"0 



leg 6-3 



„ hand, to aj^ex of claw of medius 3*5 



