AET. 8. MILLIPEDS OF CENTRAL. AMERICA — CHAMBERLIN. 25 



This and related genera may conveniently be placed in a group 

 Oxypyginae, characterized superficially by having a prominent, 

 acute, caudally directed process from each anal valve. All have the 

 collum widely, semicircularly rounded below, and all ordinary seg- 

 ments from the second caudad with deeply impressed and complete 

 segmental sutures. In the known species scobina are present on all 

 but the first few and the last few segments, and the gonopods are of 

 the general pattern of those of Rhinocricvs. 



63. OXYPTGIDES MBSITES. new species. 

 Plate 10, figs. 11, 12 ; plate 11, figs. 1, 2. 



The segments are black above, or nearly so, caudad of the suture 

 and lighter, fulvous to chestnut, in front of it, the dark color fading 

 out down the sides in the male type, but not so much so in the large 

 female paratype. Head smooth. Sulcus distinct across vertex and 

 below, but obsolete at upper level of antennae. Distal joint of anten- 

 nae with four sensory cones. Collum widely rounded below in the 

 ordinary manner. A distinct sulcus above lower margin on caudal 

 half, but this not extending to anterior corner. Second tergite pro- 

 duced below the collum. On its ventral, horizontal portion a sub- 

 marginal ridge runs mesocaudad from the anterior corner. The fur- 

 row on caudal side of this ridge ends mesally in a deep pit. Seg- 

 mental sulcus represented on lower part of side by a somewhat pit- 

 ted or cross-marked furrow, behind which the segment is longitudi- 

 nally straight, the furrow continuing as a clearly defined sulcus en- 

 tirely across dorsum. On the following segments the sulcus is also 

 complete and sharply defined. Striae are present only below. The 

 pore is contiguous with the sulcus, which is not at all excurved at its 

 level. The scobina are of characteristic form. The deep anterior 

 impression of each is very wide, the two being separated by but 

 little more than their width, but becoming smaller in going caudad. 

 The posterior rfegion of scobina short, being only about twice as long 

 as the anterior impression, narrowed caudad. The scobina are pres- 

 ent back to about the fifth segment from the caudal end. Anal 

 tergite obtusely angular behind, exceeded by the valves, depressed 

 transversely across middle of length. Anal valves moderately com- 

 pressed, produced at upper angles of mesal borders into the usual 

 pointed processes; these weakly curved and well removed from the 

 tergite (pi. 10, fig. 11). 



Anal scale as shown in plate 10, figure 12. 



Gonopods as represented in plate 11, figures 1 and 2. 



Number of segments, about 50. 



Tvength, about 75 mm. ; width, 6.8 to 7 mm. 

 31.36— 22— Proc.N.M.Vol.60 18 



