1910] Diplopoda from the Western States 255 



Head with a furrow-like depression between the two eyes, the fine 

 median longitudinal Hne extending from this across the vertex. 



Eye areas oval but with the inner ends obliquely truncate. Ocelli 

 convex, arranged in eight transverse rows as follows, counting from 

 above ventrad: 4, 8, 9, 9, 10, 11, 9, 5, making a total of (35, in the speci- 

 men described. 



Antennae of medium length, slender. 



Cervical plate large. A weak median longitudinal impression 

 which is obsolete on anterior portion. Lower lateral portion impressed 

 with a longer striation near and subparallcl with margin and dorsad 

 of this and extending from the caudal margin a second, short stria, one 

 or two other similar ones sometimes indicated. 



Other segments sharply striate beneath. Spiracles small, not 

 touching the transverse suture which is sinuate at its level. 



Anal scutum smooth. Distal portion triangular, the apex sharply 

 angular, straight, not at all decurved. 



Anal valves with the mesal margin elevated, setigerous. 



Anal scale roughly triangular; each lateral side mesally convex; 

 incurved adjacent to proximal and distal angles; cephalic margin widely 

 convex. 



Male: Gnathochilarium with stipes not produced mesally. The 

 very large promentum obovate, a little crenately incised each side of the 

 middle on distal margin and also proximad of each disto-lateral corner. 

 Hypostoma free except laterally. vSee PI. XL, fig. G. 



First legs of male strongly enlarged, uncinate. The inner surface 

 tuberculate as usual, and bearing long bristles as shown in the figure. 



Second legs of male reduced excepting for greatly enlarged coxae, 

 as usual; the claws small. See PI. XL, fig. 7. 



Gonopods of male large and conspicuously exposed. The anterior 

 pair with the mesal branches a little the longer, attenuated from the 

 base distad but produced caudo-laterally near or a little below its mid- 

 dle height. Outer branch clavately enlarged distad, embracing the 

 first on the antero-lateral surface; pilose with long hairs over the distal 

 end and proximally along the disto-mesal face for part of the length. 



Posterior gonopods with the outer distal branch somewhat clavate 

 apically and densely pubescent with fine short hairs. Inner branch 

 almost straight, blade-like, acutely pointed. From the inner edge of the 

 outer branch springs a third, spine-like, process which extends distad 

 between the two main ones. Sec PI. XL, fig. 8, and PI. XLI, figs. 1, 

 2, and 3. 



Length of a male 55 mm. Width 3 mm. Length of antenna ad 

 3 mm. Number of segments 51-57. 



Locality — Canyons of the Wahsatch Mountains, Utah. 



The most common diplopod in Utah. It is evidently 

 closely allied to P. furcifer, which it resembles much in general 

 appearance and in the general type of gonopods in the male. 

 The latter are readily to be distinguished, however, both from 

 characters in the anterior pair and especially those of the pos- 



