124 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESOTA—1918 
than the anterior shield, bears two pairs of branched hairs. On the 
ventral side the mandibles are concealed inside of a slender tube with 
flaring mouth, on its ventral side a pair of serrate blade-shaped ap- 
pendages. Mandibles scimiter shaped, with an expanded serrate blade 
at the tip. Palpi slender, segments of about equal length, thumb pap- 
illa-like with several long hairs on its tip, claw short, thick and nearly 
straight, slightly bifurcate at tip. Coxae very large, nearly touching 
on the median line, coxae I with two branched hairs, coxae II and III 
with one branched hair each. A pair of hairs opposite the interval 
between coxae I and I! and coxae II and III. Spiracles between 
coxae I and II. Two pairs of branched hairs posterior to coxae III. 
Anus midway between coxae III and posterior margin. On the pos- 
terior end of the body are four long branched hairs. 
Legs stout and long, tarsi normal except tarsi III, which resem- 
bles those of Sericothrombium scabrum. 
Eggs. Vypical as to shape and appearance, orange in color. 
Diameter 0.15 mm, fifty to one hundred in a mass. 
Ten adults taken on June 16, 1917, in a small clearing on Big Is- 
land, Lake Minnetonka, Minnesota, near a low marshy area. Some 
were entering the soil to oviposit. 
Attempts were made to rear this species from the eggs, but 
failed. The eggs require about twenty-five days to hatch, the shell 
rupturing and the legs of the embryo protruding after the eleventh 
day. The larvae are easily distinguished from those of the other 
species reared by their lighter yellowish color, and more elongate form. 
Microtrombidium albovittatum. n.sp. 
Adult female. Color scarlet, under parts, legs and cephalothorax 
brighter. ~Size 1.65 to 2 mm long by 1 to 1.35 mm wide. Body 
slightly constricted in the middle similar to Serico. scabrum, but more 
slender and no posterior indentation, covered with slender plumose 
hairs. Two deep transverse grooves in the wide anterior part of the 
body, a third at the point of constriction, in the narrower posterior 
part three pits connected by two shallow grooves, and forming a V- 
shaped demarkation. Parallel to and just posterior to the anterior 
groove is a wide white band, on each lateral margin posterior to this 
band is a triangular white area with the base outward and apex ex- 
tending between the second and third transverse grooves. On _ the 
ventral surface the genital opening is opposite coxae IV. The anus 
is half way between the genital opening and the posterior margin. 
The cephalothorax is set in a deep anterior emargination, con- 
cealed partly by the overhanging abdomen, longer than wide. Eyes 
