
No. 426.] UTAH CHILOPODS OF THE GEOPHILIDZ. 475 
relatively rather narrow, its sides very gently curved convexly (9) or 
concavely ( 2), converging posteriorly ; anal pores moderately large. 
Pairs of legs of male seventy-three, of female seventy-five. Length 
of male 55 mm., width 1.6 mm.; length of female 49 mm., width 1.5 mm. 
Adolescens. — A a, 30.5 mm. long measures .7 mm. in width ; 
length of antennae 2.6 mm. ; pleural pores very small, eight on each side ; 
pairs of legs the normal oum (75) ; coloration as in adults. 
Habitat.— Under stones in the gullies of the hillsides north of Salt 
Lake City. 
The types were collected March 28, 1901. 
Geophilus xenoporus sp. nov. 
Description. — Moderately robust, distinctly attenuated caudad and 
cephalad ; head and prehensorial feet sparsely pilose with long or moder- 
ately long hairs, cephalic plate punctate, especially at sides, with moderately 
coarse puncte, the prosternum and coxa of prehensorial feet sparsely 
minutely punctate, dorsal and ventral plates nearly glabrous, smooth or a 
little roughened ; head and prehensorial feet with prosternum light brown, 
body, legs, and antennz yellow. 
ntennz rather short (d 1.602 mm. 9 2.4-2.5 mm.); first seven 
or eight joints sparsely pilose, the others, especially the final ones, densely 
clothed with short straight hairs; articles all long, the ultimate subequal 
to the two preceding taken together. 
Cephalic plate much longer than wide (7:5 nearly), narrowed poste- 
riorly; posterior border somewhat rounded, covering the ba sal plate ante- 
riorly ; with two rather long lateral sulci and a brief but sharply impressed 
median line immediately caudad to the frontal suture; basal plate rather 
large, width about three times the middle length, the plate being more 
exposed laterally. 
Claws of prehensorial feet when closed reaching or a litle surpassing 
the distal end of the first antennal article; claw armed at base with a long 
subacute tooth; inner side of coxa long, armed similarly to claw but tooth 
somewhat stouter; prosternum nearly equal in length and breadth, less 
than twice the height of the coxa, the anterior border narrowly and acutely 
incised, unarmed. 
Dorsal scuta bisulcate, the sulci distinct throughout; anterior prascuta 
short, the middle long or very long, the posterior moderate 
First spiracle mtg oval, the others circular, not inch decreasing 
in size caudad, all 
Ventral Pati cens a median sulcus which is deep, especially cephalad. 
Legs sparsely pilose ; the first pairs shorter and much more slender than 
those eres: ; the anterior pairs stouter than the posterior but not much 
differing in length ; anal legs of male much swollen, those of the female more 
slender, with a ca or indistinct claw in the male, longer in the female. 
