1910] Diplopoda from the Western States 239 



excised. Mentum with distal border broadly angular, fitting into exci- 

 sion of promentum; greatest width apparently about three and a half 

 times the mesal length, but the position of the sclerite and some 

 difficulty in determining the proximal limit leaves room for some uncer- 

 tainty. 



Ocelli arranged in a narrowly sub-triangular patch, the apex directed 

 mesad and toward that of the opposite eye; caudal margin shortest, 

 a little convex, the dorsal margin convex near caudal margin and con- 

 cave near apex or mesal angle, the ventral margin concave. Ocelli in 

 four series, counting from ventral row dorsad as follows: 7, 6, 4, 3, 

 giving all together 20 or thereabouts. 



Antennae strongly clavate, the fifth article longest and thickest,, 

 the first three especially much more slender. 



First segment clearly longer than the second, the cephalic margin 

 mesally protruding, the lateral portions straight or but little concave. 

 Caudal margin nearly straight, distinctly excised immediately mesad 

 of carinal comers, the latter angularly projecting caudad or latero- 

 caudad, the posterior of the two lateral bristles projecting caudo- 

 dorsad and somewhat laterad from bottom of this excision. Depressed 

 or widely furrowed longitudinally on each side between median line 

 and the lateral margin, the anterior of the lateral bristles springing 

 from the cephalic portion of its depression in a dorso-cephalic direction. 

 The innermost bristle near cephalic margin and well toward the median, 

 extending dorso-cephalad. 



Anal scutum in outline as viewed from above somewhat trapezoidal, 

 the lateral margins not strongly converging; caudad widely sub- 

 truncate, the lateral angles somewhat rounded. Papilla on each side 

 nearly midway between the median line and the lateral margin, bear- 

 ing a long curved bristle. A pair of long bristles borne on weak eleva- 

 tions each side of the median line and half-way between caudal and 

 cephalic limits; and each lateral margin with a long bristle arising 

 from near anterior angle and a weak tooth or acute obtuse bristle 

 midway between anterior and posterior ends. 



Anal valves with caudo-dorsal angle sub-acute, apically but weakly 

 rounded, the caudo-ventral angle obtuse. Each valve bearing three 

 long bristles, a little within the ventro-caudal margin, these bristles 

 projecting caudad, the most ventrad being at the obtuse caudo-ventral 

 angle or extension and closer to dorsal scutum than to anterior end of 

 free margin, the other two equidistant from this one, with the upper 

 one closer to scutum than to median bristle. 



Ventral scale bearing two long, caudally directed bristles. 



Anterior pairs of legs, in female at least, with distal joint bearing 

 beneath a conspicuous comb-like series of stout bristles. See PI. XXXIII, 

 fig. 8. 



Appendages of second segment large and distinct. Two sub- 

 cylindrical processes springing from a main plate or fold and extending 

 ventro-cephalad, these processes translucent or transparent distallv. 

 See PI. XXXIII, fig. 7. 



Length 7-8 mm. 



