130 SEVENTEENTH REpoRT STATE ENTOMOLOGIST oF MINNESOTA—1918 
band just anterior to the groove opposite median constriction of the 
abdomen, the spines in this area white. Very much wider in front 
than behind, size 2.5 mm by 1.5 mm. Abdomen overhangs the cephalo- 
thorax slightly, clothed with stout, thickset tapering hairs, each with 
numerous long branches. A shallow groove near the anterior mar- 
gin, a second deep one at the median constriction, a third arched groove 
posterior to this, with three pits forming a triangle near the posterior 
end. Ventral surface of a creamy color except that portion posterior 
to the last coxae. Cephalothorax set into an anterior emargination to- 
gether with coxae I and II. Coxae III and IV near the median con- 
striction, genital opening opposite coxae IV, anus two-thirds of dis- 
tance from genital opening to margin of body. 
Legs slender, tend to a creamy color except legs I which are scar- 
let, legs I] shortest, legs [IV reach much beyond body. Tarsi I about 
five times as long as wide. Covering hairs of legs slender. 
Cephalothorax light colored—wider than long—Dorsal groove 
with the expansion in the middle. Eyes stalked, about opposite the 
expansion of the dorsal groove, sharp pointed at the top. Palpi short 
and thick, segment II very much swollen, nearly as wide as long; seg- 
ment III wider than long, about a third as long as I1; segment IV twice 
as long as III, a very heavy tooth on the extremity, longer than the 
segment; thumb slender, clavate and reaching beyond the end of the 
claw; long, slender, branched hairs on segment IV reaching nearly to 
tip of claw. 
Male. Similar to female—size 1.4 by 0.95 mm. Legs more slen- 
der, and grooves of body more marked. Outline of body is more 
wedge-shaped. 
Two males and a female taken in leaf covered humus under wild 
raspberries, Big Island, Lake Minnetonka, Minnesota, June 16, 1917. 
OnE GEARS. 
Under this heading will be described the undetermined larva 
which attacks man in Minnesota. It is obviously the larva of one of 
the Trombidiidae and according to Oudemans (1912) would be the 
larva of a Microtrombidium. It does not, however, conform to the 
characters of one member of this genus, which we have bred and which 
is described in this paper. These larvae will attack birds as well as 
man. During the summer of 1916, large numbers of prairie chickens, 
quail and pheasants were attacked by them on the Game Preserve at 
Lake Minnetonka. They penetrated the skin so thickly about the neck, 
anus and under the wings that immense areas of the skin were in- 
