126 SEVENTEENTH Report STATE EntTomoLocist oF MINNESoTA—1918 
Legs rather stout, legs I as long as the body, legs IV reach beyond 
the body. Tarsi I three times as long as wide. Legs have clavate 
hairs on the dorsal side, slender branched hairs on the other surfaces. 
Male. Smaller than female, 1 mm long by 0.5 mm wide, lighter 
colored, cephalothorax longer than wide, genital opening concealed with 
long bristles. 
A female collected in leaf mold under trees along Minnehaha Creek, 
Minneapolis, May 2, 1917, also one male and one female collected in 
similar material on Big Island, Lake Minnetonka, Minnesota, June 16, 
1917. 
Microtrombidium punctatum  n.sp. 
Male. Color, pale orange red, size 1.50 mm long by 0.90 wide, 
body oval in outline, wider in front, not constricted at the middle, 
anterior margin concave, posterior margin widely rounded. Body and 
cephalothorax clothed sparsely with intermingled stout, blunt, barbed 
hairs, and knobbed hairs, with the knobs bent backward, the upper 
surface of the knob on these hairs is cuplike and filled with a soft 
membranous mass. Legs with knobbed hairs on the outer edges and 
slender barbed hairs on the inner edges. On the dorsum are six pairs: 
of large, deep pits, but no grooves. On the venter the genital open- 
ing a little posterior to coxae IV, three times as long as wide. Anus 
the length of the genital opening posterior to it, very large and circular 
in outline. 
Cephalothorax large, wider than long, not hidden by the abdomen. 
Eyes sessile, opposite the middle of the cephalothorax. Dorsal groove 
expanded at the posterior extremity. Palpi stout and strongly flexed, 
segment II not much swollen, a third longer than wide, 
segment III as wide as long, segment IV longer than III, two long 
slender claws on the tip, inner one smaller, thumb slightly clavate, 
longer than segment IV. On the inner surface of segment IV is a 
dorsal comb of stout spines, parallel to this is a row of six heavy spines 
in line with the base of the smaller claw, several stout spines are placed 
irregularly at the base of the thumb. On the outer surface of seg- 
ment IV is a row of three heavy spines at the base of the thumb. Legs 
stout, legs I not quite as long as the body, legs IV reach beyond the 
body. Tarsi I somewhat swollen, three times as long as wide. 
One specimen collected among fallen leaves in woodland, Minne- 
haha Creek, Minneapolis, May 16, 1917. 
Microtrombidium muscarum (Riley) (?) 
Atoma parasiticum Latreille. 1806 (larva). 
Astoma parasiticum Riley, 7th Missouri Rpt. p. 177; 1875. 
