ATOPETHOLID MILLIPEDS — HOFFMAN AND ORCUTT 147 



cf . Sixth and seventh segments with their lower surfaces thickened and extending 

 inferiorly. Coxae of second leg large; that of the third leg bearing a long, slender, 

 pointed process; coxae of fourth, fifth, and sixth with a wide, somewhat triangular 

 apophysis. 



Number of segments 44. Length, 32 mm. 



Saussjirobolus neglectus Carl 



Spirobohis nietanus Saussure and Humbert, 1872, p. 89. 



Saussurobolus neglectus Carl, 1919, p. 391, figs. 17-22 (male holotype, Mus. Hist. 

 Nat. Geneve, from Cuernavaca, Morelos, Mexico). 

 Saussure and Humbert reported specimens from Cuernavaca that 

 they thought to be conspecific with the species nietanus, which 

 Saussure had previously described from the same locality. These 

 spechnens were, however, much larger than the original types, and 

 with more segments, and on this basis Pocock suggested (1910) that 

 perhaps two species were involved. This possibility was explored by 

 Carl, who restudied the gonopods of the specimens concerned, and 

 found differences in the posterior pair. He thereupon proposed the 

 appropriate name neglectus for the larger species, and illustrated the 

 genitalia of both in useful detail. Some of his drawings are intro- 

 duced here for comparison with Onychelus (fig. S,d,e). 



Saussurobolus zacatecus (Chainberlin), new combinalion 



Arinolus zacatecus Chamberlin, 1947b, p. 51, figs. 59, 60 (male holotype, Acad. 

 Nat. Sci. Philadelphia 9974, from the Sierra Temperoso del Oro, Zacatecas, 

 Mexico, collected in June, 1934, by H. A. Pilsbry). 



Arinolinae, new subfamily 



The four genera of this group include small-bodied atopethohds 

 with numerous structural pecidiarities. The body form is subparallel 

 except for the enlarged sixth and seventh segments, and the slightly 

 constricted segments just behmd the collum. The telescoping of the 

 caudal-most segments is limited to the last two or three, and there 

 not to the extent found in the Eurelinae. The ocellaria are small 

 and rounded, each with 25 to 40 ocelli, and are separated by a dis- 

 tance about equal to 2}^ to 3 times the diameter of an ocellarium. In 

 contrast to the antennae of the Eurelinae, those of the Armolinae 

 are considerably larger and longer, and reach back past the coUum, 

 in some cases as far back as the fourth segment. Although there are 

 fewer body segments (from 35 to 45), the visible part of each segment 

 is considerably more extensive than in larger members of the family, 

 and preserves the normal ratio of body length to width. In the mate- 

 rial studied for this character, there is a distinct remnant of a mid- 

 dorsal longitudinal sutm-e on the metazonites. Transverse sutures 



