June, 1907.] 
American Species of Papirius. 
169 
0. Papirius unicolor Harvey. Plates XI and XII. 
1893. Papirius unicolor Harvey. 
1895. Papirius unicolor DallaTorre. 
1903. Papirius unicolor Guthrie. 
Prevailing color light brownish-purple throughout, color 
much like that of a Delaware grape; back, end of legs, and apical 
half of the antennae darker; dorsum often with two interrupted 
stripes of darker shading, head, base of antennae, base of legs, 
spring and ventral surface lighter; young, half grown specimens, 
and full grown specimens in damp situations paler; occasionally 
a very large specimen and those taken in dry places are more 
brown, but all show the purple tint. Sides of full grown speci¬ 
mens often obscruely marked with pale oblong spots. Head 
viewed from front as long as broad, depth half the length; ele¬ 
vated between the eyes and bearing a tuft of long hairs. An¬ 
tennae long, slender, elbowed at the second joint, nearly as long 
as the body; basal joint short but slightly longer than the ter¬ 
minal one; second joint shorter than third, the portion beyond 
the elbow usually somewhat longer than the two basal joints; 
third joint usually the longest, the terminal half composed of 
seven or eight sub-segments; terminal joint short, conical, nar¬ 
rower than the club-shaped end of the third joint; composed of 
about ten sub-segments, the three basal of which are about the 
same length, and obscure, fourth and fifth wider and well de¬ 
fined, sixth and seventh narrower and somewhat obscure; each 
segment bears a whorl of hairs, and as there are three whorls 
on the portion below the seventh segment probably it represents 
three more joints; when walking the basal joint of the antennae 
is projected upward and outward from the head; the apical por¬ 
tion beyond the elbow outward and downward. Eye patches 
prominent, elevated, black, bearing eight ocelli, four in the 
inner row, three in the outer with a single small one in the midlde ; 
the second ocellus from the front in the inner row is also smaller 
than the others. Body, including head, twice as long as broad, 
breadth and depth equal, gradually widening from the neck to 
the greatest width, abruptly narrowing with a slight re-entering 
angle to the conspicuous terminal segment. Legs long. Claws 
prominent; larger curved and bearing two teeth on its inner 
face, below the middle; smaller claw slender, over half the length 
of the other with a small tooth on its inner surface. Fureula 
rather long and slender from about three-fourths to longer than 
body; mucrones less than half the length of dentes, lanceolate, 
unarmed, concave below and bearing on each edge of the con¬ 
cavity a row of about forty teeth .which increase in size outward 
and at the end join in a common tubercle; dentes long, slender, 
covered with hairs. Ventral sucker short, cylindrical, tactile 
filaments white, covered with papillae, nearly as long as bodv. 
