March, 19 iS- J WaTSON : BUTTERFLIES OBSERVED IN OnE DaY. 3 



highly metabolic and require oxygen very rapidly. My contentions 

 were further proven by preparing slides and sealing the edges of the 

 cover slips with a thick ring of paraffin. The blood was made to flow 

 over along the edges as usual, but no syncytial tissue-like masses 

 were formed. Apparently the air was unable to filter through this 

 thick layer of paraffin. 



A drop of blood permitted to remain in the center of the cover 

 slip usually will assume a light yellow or light brown color. How- 

 ever, if the preparation is manipulated in such a way as to permit the 

 drop of blood to come in contact with the edges of the cover-slip it 

 rapidly turns black in color. This is due to the fact that the air 

 filters through the vaseline and the tyrosinase present in insect blood 

 oxidizes the colorless tyrosine producing a dark pig-ment. 



A LARGE NUMBER OF SPECIES OF BUTTERFLIES 

 OBSERVED IN ONE DAY'S COLLECTING. 



By Frank E. Watson, 

 New York, N. Y. 



This paper might be entitled Butterflies of Fort Montgomery, as 

 it deals exclusively with those observed at that locality, except that 

 no attempt has been made to list all the species known to occur there. 

 The writer simply wishes to bring out what he believes to be an ex- 

 traordinary number of forms observed on the wing in one day in a 

 single locality. 



Fort ^Montgomery, Orange Co., N. Y., is a small historic town 

 situated on the west bank of the Hudson River, some five miles south 

 of West Point and al)out forty-three miles, on an air line, north of 

 New York City. It is practically in the heart of the Highlands, with 

 Anthony's Nose looming up on the opposite shore and Bear Moun- 

 tain a mile or two to the west.^ The region is well watered and 

 rather rugged; the hills are steep and attain an average altitude of 

 about 1,200 feet; the vegetation is rich and diversified. The collecting 



1 Those interested should consult the U. S. Topographical Maps — West 

 Point and Schunemunk Quadrangles. 



