June, 1907.] American Species of Papirius. 169 



6. 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. Furcula 

 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 body. 



