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to their sensibility to light. L. fusca gave us on the date first men- 
tioned, May 7, less than two males to one female (1.6 to 1) at the lan- 
tern trap, while for fristis the ratio was 1.4 to 1 (79 and 56). L. har- 
ticula seems to be an intermediate species in this respect. Of 537 speci- 
mens discriminated as to sex, 152 males and 33 females were taken at 
lights (nearly 5 to 1) and 194 males and 158 females on trees (about 
dca.to, 1). 
eee taken and at whatever part of the season, it is rarely that 
the females exceed or even equal the males in the same collection. 
Throwing together 2,600 specimens of several species, taken at frequent 
intervals throughout the season of 1891, the sexes of which we have 
separated, it appears that the ratio of males to females at lights was 
16.5 to 1, and from trees and various surface shelters (839 specimens) 
1.3 to 1. My data on this subject may be conveniently exhibited in the 
following tabular form: 
At Light. On Trees, etc. 
Species. Dates. Bate 
No. of Ratio of male No. of Ratio of male 
2 Specimens. to female. Specimens. to female. 
“CRY CL ME NR en ee Apr. 18—June 4 94 a2 193 je) 
HAY GI CULE: saci 0 Apr. 29—June 24 185 4.6 3d2 dhs 
DAV ELS Bai sicietsc:e'ee © Apr. 29—June 28 1,418 51.0 271 Wes 
GDIATISs aac ie cto se IMD GIV: Doth es hate istetve LSD ites 1.4 
PUN DOSE Soc vivre a's May 15—June 24 42 13.0 20 2e5 
The adult beetles emerging from the ground, flying about at night* 
in search of food, pair in the trees, to which they resort in myriads, 
and retreat again to the earth by day. Their first flight is made in the 
early evening, beginning at dusk, as they pass from the ground where 
they have lain hidden by day to the trees on which they feed. With 
the advent of day they fly from the trees to the earth, and hide them- 
selves an inch or less under ground, or sometimes merely creep under 
fallen grass and other similar shelter. 
Particulars concerning this retreat to their hiding places at the 
dawn of day are given in notes made by Mr. John Marten and Mr. 
Philip Hucke, detailed for night-work on June beetles May 19, 1891. 
3:45 a. m. Mr. Hucke reports the occasional dropping of a beetle 
from trees in the artificial forest (chiefly butternuts and_hickories) 
where these observations were made. At 4:05, an occasional beetle still 
dropping to the ground without making any effort to fly. At 4:10 the 
air suddenly became full of flying beetles. One and then another be- 
gan to make a buzzing noise with its wings, when, as if at a general sig- 
nal, they deserted the trees in thousands, and by 4:25 everything was 
still again and nearly every one was gone. 
Within the woods the beetles flew to a distance from the trees about 
equal to the height from which they started, the lower ones on the trees 
making a somewhat longer flight proportionally. Striking against the 
weeds and undergrowth, they folded their wings, and by 4:30 o’clock 
reached the ground within a hundred feet of the trees from which they 
* A single species has been observed to fly by day in Utah. (Proc. Mnt. Soc. 
waVashiy Viol. Lis ph 24.) 
—8 BE 
