1868.] 163 [Mann. 



wing. Body bluish-black, abdomen white, antennaB black, annulated 

 with wliitc, club tipped with fulvous. 



Male expands 1^ inch. Female expands 1|- inch. 



Taken in Milford, N. H., July 20th. Supposing it to be a species 

 hitherto undescvibed, I have given it the name of a river in the im- 

 mediate vicinity of which I captured it. 



Ml-. B. P. Mann oftered tlie following remarks on the pres- 

 ervation of larvce in carbolic acid, S2:)ecimens of which were 

 exhibited : — 



The numbered bottles, excepting No. 26, contain specimens collected 

 on the 18th and 19th of June. These were placed in a mixture of 

 one part of carbolic acid to one hundred and fifty parts of water, to 

 which I think some alcohol and glycerine were added. The colors, 

 with the exception of the green, have been perfectly preserved in all 

 the specimens, and the green has been preserved in some of the speci- 

 mens. I believe that green is the most difficult color to preserve in 

 alcohol ; one green specimen of mine has changed to a bright yellow in 

 one day, being placed in a half-and-half mixture of alcohol and car- 

 bolic acid water containing j^-^ carbolic acid. Alcohol also is ajit to 

 shrink specimens, but none of these have shrunk, although now kept 

 five months. In bottle 15, collected June 18, 18G8, are two specimens 

 originally green, one of which has retained its color perfectly, but has 

 been disintegrated beneath the skin so that bubbles of air are seen to 

 move around in it. This has not seemed to become worse for three 

 months, but led me to strengthen my solution. For all specimens col- 

 lected since June, I have used a solution of -^ carbolic acid and ||- 

 water. I added the carbolic acid in drops to cold M-ater and shook it 

 till it was all dissolved, then strained it through a cloth and used it. I 

 subsequently followed directions which were given me, and used boil- 

 ing water instead of cold water, which I think must improve the 

 mixture, although I have made no experiments to show it. I consider 

 bottle 26, collected in the last week of last August, as the most perfect 

 success, the delicate shades of green and pink having been pre- 

 served unchanged. This, and the three unnumbered bottles, are 

 preserved in the stronger -^ solution of carbolic acid. 



Dr. II. Hagen exhibited a remarkable specimen of Morpho 

 Ilioneus, which he had found among the Brazilian insects 

 belonging to the Museum of Comparative Zoology. In 



