> -12- 
pine forest zone. It also shows that within 6 days beetles can infest 
fields 7 miles from the point of liberation. * * * In the fall when the 
beetles are on the wing seeking hibernation quarters the direction of their 
flight is greatly influenced, if not governed entirely, by the direction 
of the wind. The same is evidently true for their spring dissemination." 
Lethal temperature for adult wireworm.—Reporting on the effect of 
high temperature on the sexes of the wireworm Pheletes californicus Mann., 
Roy E. Campbell and W. E. Stone, Alhambra, Calif., say: "Sixty per cent 
of a small lot of P. californicus males and 20 per cent of the females 
confined in outdoor oviposition cages succumbed when the soil surface 
temperature on February 27 reached and remained at 105° F. for one-half 
hour." 
Temperature and wireworm growth.-C. E. Woodworth, Walla Walla, Wash., 
reports that experiments in weighing young larvae of the wireworm Pheletes 
canus Lec. kept at different temperature and in varying numbers (from 1 
to 50) per can, have shown that 86° F. was sufficiently strenuous to pre— 
vent sufficient eggs from hatching to fill the "50" cans. The day-old lar-— 
vae were moderately small as compared with the others but after a month 
had elapsed they were still quite small. They were, however, 5 1/2 times 
their day-old weight. The day-old figure may be a little in error, owing to 
small numbers available. All of the others show about a 10—-times growth, 
reaching a maximum of ll times at 73°. There is a slight falling off at 
68°, being only 9 1/2 times, in spite of the fact that 37 days elapsed 
between weighings. 
Light trap effective for mushroom flies.-A. C. Davis, Takoma Park, 
Md., reporting on studies of sciarid flies, says: "A light trap similar to 
the one described by Herms and Burgess (Electrical West. 60: 204-205, 
Apr., 1928) has given surprisingly good results so far. In one heavily 
infested mushroom house at Capital Heights, Md., 65.93 grams, or 187,142 
flies, were caught in a 24-hour period. * * * of these 74.91 per cent, 
or 140,207, were females, of which approximately 55.26 per cent were gravid. 
It is the habit of these flies, when caught or otherwise in trouble, to 
deposit all of their eggs in a mass. There were thousands of eggs so laid 
in the bag of the trap, so that the percentage of females gravid at the 
time they entered the trap would probably be around 70; 9.82 per cent of 
the females were newly emerged, and probably never had laid eggs. There 
were also in this catch approximately 10,680 phorid flies, 28.29 per cent 
(505.27) males and 71.60 per cent (746.75) females, of which 32.75 per cent 
were gravid." 
FOREST INSECTS 
Spray for spruce budworm.-The data secured by B. H. Wilford on the 
convroil of Harmologa fumiferana Clem. in Cody Canyon, Wyo., have been sum— 
