ais) 
and snow. Plowing in spring, if well done and as early as 
possible, will also be successful, though in some cases a few 
grasshoppers may succeed in reaching the surface. 
In regard to the Rocky Mountain locust, it is possible thata 
small swarm of this destructive species has again settled in our 
state. At least it was stated in some newspapers published in 
the Red River Valley, that a swarm had been observed some- 
time during the middle of August, flying in a south-easterly di- 
rection over Polk county. Inquiries failed to determine posi- 
tively whether they had settled or not; if they have they will 
be found south of Crookston, and farmers located in that region 
should watch carefully, and give timely warning of their pres- 
ence, so that steps can be taken to prevent their increase, 
PARASITIC ENEMIES OF MIGRATORY LOCUSTS. 
The Red Mite—( Trombidium locustarum Ril.)—Early in the 
spring of 1895 the full grown red mites or locust mites illus- 
trated in figs. 825 and 33, were found running about almost ev- 
erywhere in fields and gardens. These friendly mites, of a 
vivid scarlet color, and with the peculiar gloss of silk, are well 
known to children, who are in the habit of calling them the 
“ducky spiders,” very likely from the German ‘‘Glueckspinnen,” 
because finding them in the early spring is claimed to be acer- 
tain promise of a lucky day. And no wonder, because they are on- 
ly found running about on warm and dry spring days, when all 
nature is reviving from a long wintex’s rest, when the bare and 

Fig. 324%—Trombidium locustarum.—a, mature larva when about to leave the wing 
of a locust; b, pupa; ¢, male adult when just from the pupa; d, female—the natural 
sizes indicated to the right; e¢. pupal claw and thumb; f, pedal claws; g, one of the 
barbed hairs; h. the striations on the larval skin. (After Riley). 
