94 JOURNAL OF THE 



the phosphorescence re-nppeared, and I do not believe once disap- 

 peared again until it was placed in alcohol, June 16, 1887. 



October 1, 1886, I placed it in a glass jar of earth. It made 

 a cell in the earth next the side of the jar, Avhere I could observe 

 the phos])horescence, and where it remained (excepting one warm 

 day in February, 1887, when it came to the surface, and returned 

 at night when I placed the jar in a cooler ])lace in my room) 

 coiled up until the 15th of A])ril. At that time the luminosity 

 was becoming more brilliant and the brown color was disappear- 

 ing, to be replaced by a uniform cream coloi\ 



I removed the earth from above the cell and took tlic insect 

 in my hand. It immediately straightened and began crawling. 

 When placed in the jar it sought its cell and there remained. 

 Instead of returning the earth I placed a glass over it, so that I 

 might observe the beautiiul display of light. It was so strong 

 that I could read print by it when the letters were one-eighth 

 inch lono;. About the 1st of May it ca^t its skin and became of 

 a uniform cream color, lighter on the sides and ventral surface 

 and between the segments of the dorsum. 



Every night it came from its cell and wandered about the jar, 

 probably striving to attract its mate. May 8 I took it out of 

 doors at night, and placed it on the ground for about fifteen 

 minutes. Nothing was attracted. Twice I took it in the day- 

 time, — the 10th and r2th of May, — but nothing was attracted. 



May 19 I placed it, with another (collected by Professor 

 Holmes), in a large, open, glass jar, with about one inch in depth 

 of earth. This I partly sunk in the earth in the open woods just 

 at dusk. At nine o'clock the same evening I visited the place 

 and saw a male within the jar. When it left its mate I caught 

 it.* On the f >llowing morning I found another male outside 

 the jar. The Ibllowing night I captured two more males. Dur- 

 ing the day the females remained beneath the surface of the earth. 



The luminosity in this case is decidedly of sexual significance, 

 attracting the males at night. Mr. Rivers concluded that the 



^Determined by Professor Riley as Pheiigodes laticollis Horn. 



