April, ’18] 
BURKE: BUPRESTID NOTES 
209 
vations have been made at all times of day. The normal time of 
emergence is thus approximately two hours after sunrise, but if sunrise 
—as far as the eggs are concerned—is artificially delayed by keeping 
them in the dark, emergence will also be delayed. To just how great 
an extent, and how lack of light fails to prevent emergence late in the 
day, the summarized data in the foregoing table has shown. But 
this is hardly a fair comparison, and in the following table the ratios 
represent the adults emerging in the first hour of exposure to light as 
compared with the adults emerging in the dark, per hour of previous 
daylight in the same day, or rather after 7 a. m.—which is apparently 
as early as daylight is effective. 
Days after 
Collection 
7 a. m. 
9 a. m. 
10 a. m. 
11 a. m. 
12 m. 
1 p. m. 
2 p. m. 
3 p. m. 
4 p. m. 
6 p. m. 
Average 
1 
25.33 
/ 4.25 
\ 1.33 
8.08 
4.31 
6.36 
/ 12. 
\ 16.71 
15.22 
.... 
4.24 
2.26 
9.09 
9.- 
2 
.... 
4.56 
10.08 
2.4 
.... 
4.- 
[5.44 
5.1- 
5.62 
10.97 
.... 
6.35 
3 
5.11 
8.46 
5.- 
1.42 
3.77 
4.75 
4 
3.78 
1.8- 
7.65 
i .76 
6.54 
• • • • 
4.3 
5 
3.1- 
2.42 
1.48 
• • • • 
2.33 
6 
.... 
.... 
.... 
2. 
.... 
.... 
5.5 
3.75 
Average 
15.22 
4.34 
7.71 
3.5- 
3.2- 
8.17 
5.11 
6.08 
6.32 
3.88 
.... 
The average of 35 experiments indicates that six (6.19) times as many 
adults of Trichogramma minutum emerge in the first hour after being 
exposed to daylight, as emerge in the dark per hour of previous day¬ 
light in the same day. 
NOTES ON SOME SOUTHWESTERN BUPRESTID 1 
By H. E. Burke, Specialist in Forest Entomology, Bureau of Entomology, 
U. S. Department of Agriculture 
The following paper gives the host plants and some biological notes 
on eighteen species of flathead borers (Buprestid larvae) mostly from 
Sabino Canyon, Santa Catalina Mts., Arizona. Larvae and sections 
of infested wood were collected in the field and shipped to the Forest 
Insect Laboratory, Los Gatos, Calif., where the adults were reared. 
Practically all of the collections were made by Specialist W. D. Edmon- 
ston and Entomological Rangers George Hofer and Morris Chrisman. 
The names given are taken from Henshaw’s “List of the Coleoptera 
of America, North of Mexico” and are those commonly used. The 
writer is responsible for the identification of the larvae and Mr. W. S. 
1 Published by permisson of the Secretary of Agriculture. 
