22 THE WHITE-GRUBS. 
the name of army-worm, yet for a number of years 
it could not be found in the same region except by a 
trained collector. Here in St. Anthony Park it flies in large 
numbers from June 29th to Aug. 26th, and as the moths 
gathered on sugar during this time are all in fine condition 
it shows conclusively that they are constantly hatching 
throughout these three months. This insect was also found 
in great numbers at Duluth. 
THE WHITE-GRUBS. 
(Lachnosterna spec.). 
During the past few years a number of beetles proved 
very destructive to various cultivated and wild plants. 
Some of these were old and well-known offenders, while one 
species, a rose-beetle, formerly quite uncommon in our state, 
appeared in large and destructive numbers. Most of these beet- 
les belong to the well-known family of insects usually called 
WHITE-GRUBS, JUNE-BUGS or MAY-BEETLES. The genus Lach- 
nosterna, Which comprises beetles of this kind, is a very large 
one, and quite a number of species belonging to it occur in 
our state. Only two species, however, are very injurious, 
both as larve and adults; the smaller, Lachnosterna tristis 
Fab., is sometimes found in immense numbers in the vicinity 
of oaks, while Lachnosterna rugosa Melsh. occurs throughout | 
the state. Fig. 15, plate II, shows both species of may- 
beetles. Early in June, when we pass a grove of oak trees 
at dusk, we sometimes hear sounds that seem toindicate the 
presence of bees in full activity, but as no bees fly at night 
we soon detect that this peculiar sound is not produced by 
them but by the first of the above named beetles. They do 
not measure much more than half an inch in length, and are 
distinguished from all other may-beetles found in Minnesota 
by their pale yellowish-brown color, which has a red tinge 
on the head, thorax and legs, and a more yellowish one on 
the wing-covers. The insect is quite hairy, especially if 
viewed from the side; these hairs in a fresh specimen are 
of a golden-yellow color. During the day none of these in- 
sects. can be found except by digging for them in the ground, 
and even then it is merely done by accident. Toward even- 
ing, however, they leave the ground aid fly to the nearest 
