ATOPETHOLID MILLIPEDS — HOFFIVIAN AND ORCUTl^ 



125 



Color of preserved specimen nearly uniform black, the extreme 

 caudal edges of the metazonites silvery white to gray, possibly due 

 to color change in alcohol. 



Front of head smooth and polished except for several distinct 

 transverse grooves in the clypeal region; epipharangeal groove distinct 

 up to interantennal space; genae with about 12 distinct short stria- 

 tions extending to the margin of the head. Ocellaria small and nearly 

 circular, ocelli all nearly equal in size and shape, arranged in 7 rows 

 as follows: 4, 5, 6, 6, 6, 6, 5 — a total of 38; interocular space almost 

 4 times the diameter of an ocellarium. Antennae small and short, 



Figure 5. — Centrelus kerrensis (Chamberlin and Mulaik), male specimen from Real County 

 Texas: a, distal half of anterior gonopods to show the membranous lobe in front of the 

 coxal apex; b, right posterior gonopod, cephalic aspect; c, lower end of collum of left side. 



the first three articles glabrous, distal four finely setose; second 

 article longest, third through sixth slightly smaller and all subequal, 

 all articles about the same width. 



Collum somewhat wider than head but narrower than following 

 segments, its surface smooth and polished; lateral ends as shown in 

 figure 5c; second segment with about five distinct ridges behind end 

 of collum, the lowest of which is actually knobby in contour; pleural 

 lobe with a moderately elevated anterior ridge. Following segments 

 similar to second but with ridges less prominent. Near middle of 

 body the ridges become gradually more produced and project beyond 



