1912] Chilopods and Diplopods 163 
Head smooth, free from hairs except for the usual bristles along 
labrum. A transverse sulcus between eyes, each side portion bending 
caudad to meet other at an obtuse angle on mesal line, to which angle 
the median longitudinal sulcus across vertex extends. 
Antenne longer than width of body; strongly clavate; sensory cones 
long. Subdensely hirsute distally, more sparsely proximad. 
Eyes large, oblong, its upper and lower margins nearly parallel, the 
mesal convex and the ectal oblique. Ocelli arranged in five series; thus, 
3, 4, 4, 4, 2, giving a total of 17. 
First dorsal plate narrower than the head inclusive of mandibles, 
shorter than the two succeeding plates taken together. Middle portion 
of anterior margin evenly convex, laterally extending obliquely caudo- 
ventrad and somewhat concave. Caudal margin mesally straight, on 
sides convexly bending cephalad and meeting anterior margin at an 
angle. Dorsal of each lateral angles the plate is obliquely depressed or 
shallowly furrowed. 
Subsequent segments smooth above; striate ventrad of level of 
pores, the lower or ventral strize deep. 
Anal scutum in outline as viewed from above with lateral margins 
parallel or a little diverging caudad, nearly straight or slightly convex; 
caudal margin widely rounded, bearing beneath a seta on each side. 
About equalling the anal valves or a little exceeded by the latter. 
Anal valves strongly bulging from base to free mesal edge, the sur- 
face of each valve extending very obliquely ventrad. A long bristle 
borne near mesal edge of each valve near middle of length. 
Anal scale with anterior and cadual margins each strongly convex, 
the two meeting on each side in an acute angle. A pair of bristles 
springing from mesal portion. 
Number of segments 44. 
Length 12.5 mm.; greatest width ad .75 mm. 
Locality: Little Willow Canyon, Salt Lake ous Utah. 
(1905; author, coll.). 
But one specimen thus far found. 
Family PARAIULID. 
Genus Paraiulus. 
Paraiulus tivius sp. nov. 
Head light brown, a broad transverse band between eyes and ven- 
trad of their level deep brown, the band enclosing above two pairs of 
light dots, and between antenne a pair-of large obliquely placed, oval 
light spots, a bristle inserted in each of most dorsal pair of light spots; 
vertex above the dark band with network of dark lines, a stmilar network 
covering the stipes of mandibles laterally, each of the latter with dark 
transverse stripe across dorsal part. Ventral surface and lower part 
of sides of body light brown. On each side a series of black dots extend- 
ing from sixth segment to about the antepenult. Anterior and caudal 
margins pale, adjacent to the pale marginal stripe in each case a dark 
transverse band which is much widest mesally; remaining part of plate 
