118 SEVENTEENTH Report State Entomotocist or Mrnnesota—1918 
transverse groove anterior to the plate. On the ventral surface a deep 
transverse groove between the two anterior and the two posterior coxae 
and another just posterior to coxae 1V, a longitudinal groove extend- 
ing from this to the posterior end of the body. Genital opening op- 
posite coxae IV. Anus less than half way between the genital opening 
and the posterior margin. . 
The cephalothorax inserted in a deep anterior emargination of the 
abdomen, wider than long, base somewhat hidden by the overhanging 
abdomen. Eyes sessile, two on each side, placed at about the middle 
of the length of the cephalothorax. Dorsal groove expanded at the 
middle of its length into a quadrate area bearing two stout spines. 
Palpi with segment II a little more than three times as long as seg- 
ment I, segment III one-third as long as segment II, segment IV with 
two stout terminal claws, the smaller on the inner side. The inner sur- 
face of segment IV has a variable number of heavy spines, usually 
seven in a double oblique row; the oblique rows of spines are sometimes 
reduced to two in each row, and there may at times be few to several 
spines forming a dorsal crest on the segment, the number not always 
corresponding on the two palpi of a single specimen. The outer sur- 
face bears three very heavy nearly equal spines, near the ventral 
edge; in some specimens there may be only two, in others four; these 
may also vary on the two palpi of a single specimen; in ten specimens 
examined the number were as follows: 2-2, 4-4, 3-4, 3-2, 4-2, 3-3, 2-3, 
2-2, 3-3, 4-3. Thumb longer than segment IV, of nearly equal diameter 
throughout length, four times as long as wide. 
Legs slender; tarsi I nearly three times as long as wide. 
Male. Similar to female except as follows: smaller, 2 to 2.50 mm 
long by 1 mm wide, constriction of body and grooves more marked, 
does not engorge so fully as the female, cephalothorax more exposed, 
dorsal plate only twice as long as wide, and more angular, abdomen 
narrower posteriorly, genital opening narrower, legs relatively longer 
than in female. 
Nymph. Resembles the adult closely. Size 1.50 to 2 mm long by 
0.75 to 1 mm wide. Hairs on dorsum sparse and of a paler scarlet, 
those on venter, legs, and cephalothorax cream colored. Body more 
pointed at posterior extremity. Cephalothorax resembles that of the 
adult, except that it is a little larger in proportion to the size of the 
body. Palpi has only two heavy spines present on the outer surface 
of segment IV while the inner surface has an oblique row of six heavy 
curved spines whose tips reach beyond the base of the terminal claw, 
and also a dorsal comb of five heavy hairs. The legs are slender, 
