eS 
Control of sand wireworm by starvation.——"Small-scale laboratory 
experiments," by J. N. Tenhet, Fairfax, S. C., "throw an interesting light 
upon the possibilities of control (of Horistonotus uhlerii Horn) by star— 
vation: (1) Larvae kept in soil during the winter without food were prac— 
tically all dead in two months; (2) larvae kept with an abundance of un-— 
suitable food through the winter showed a very heavy mortality (even 
though signs of feeding upon the roots of the plants could be noted); (3) 
during the winter larvae were apparently able to survive a 30-day period 
without food; (4) larvae furnished with a plentiful supply of satisfactory 
food throughout the fall and winter have all come through the winter in 
good condition, with only extremely light loss in numbers." 
FOREST INSECTS 
Correction.--The specimens referred to in the January 1933 Monthly 
Letter (No. 225) p. 13, line 21, were not moths but newly hatched gipsy 
moth larvae. 
Hybridization of Tachina species results in weakened progeny.—— 
R. T. Webber, Melrose Highland, Mass., states concerning Tachina larva— 
rum L. and Tachina mella Walk., that "an interesting phase is connected 
with experiments where larvarum males from Europe were confined with 
native mella females and larvarum females with mella males." Of the 
former 47 out of 75 pairs mated; 28 flies deposited a total of 446 eggs, 
of which 80 were fertile and 19 hatched. Of the latter only 3 out of 
56 pairs mated; 3 flies laid a total of 36 eggs, none of which were fer— 
tile. Mr. Webber adds: "The results of these experiments show conclus— 
ively that hybridization, at least in the case of the American (mella) 
females, may very well occur and the imperfect fertilization of these 
individuals which do cross renders them unable to reproduce other than 
a few weakened progeny. Such being the case, it is probable that the 
least numerous species, in this case larvarum, would ultimately die 
out. * * * While hybridization of the species appears most detrimental 
lishment in New England. Other factors, such as a suitable host spec-— 
ies for hibernation and the effects of competitors, are equally impor-— 
Tanto 
Cooperative bark-beetle control.—-Reporting on the campaign which 
has been in progress on various Federal and private projects since early 
last December, J. M. Miller, Berkeley, Calif., says: "Eradication work 
is now in full swing on eight projects within the State, involving the 
employment of something over 400 men. The responsibility of this labor- 
atory has been limited mainly to the planning and direction of these 
projects * * * The two largest projects now under way are those within 
the Yosemite National Park and the Sierra National Forest, involving a 
total expenditure of $65,000. The areas that are being covered are sit-— 
uated in the yellow pine-sugar pine type. * * * Both the Yosemite Na-— 
tional Park and The Sierra National Forest have developed highly effi- 
