ART. 8. MILLIPEDS OF CE:NTEAL AMERICA CHAMBEKLIN. 35 



in male with ventrally directed processes from the coxse. Two 

 strongly chitinous, forward-curving processes from sternum of 

 fourth segment. Anal valves smooth, weakly margined. 



Genotype. — Arolus pu7%ilanus, new species. 



Closely related to AUopocockia. From this readily distinguishable 

 by the sternal processes of the fourth segment, the marked inflation 

 of the third to the seventh legs between coxse and second tarsal joint, 

 and the absence of papilla from first tarsus of third legs, as well as 

 by the characteristic structure of the gonopods. 



79. AROLUS PURULANUS, new species. 



Plate 13, figs. 10, 11 ; plate 14, figs. 1-7. 



In general dark brown to nearly black, the caudal borders of seg- 

 ments paler, and the sides often lighter from the inclusion of groups 

 of minute pale dots. Vertex of head, collum, and second tergite 

 lighter in color, dusky fulvous to fulvous, under the lens showing a 

 network of dark lines. Head dark between the eyes and antenna? 

 down to a pale clypeal border, with a light included area just mesad 

 of each eye and a small light spot on median line. In one specimen 

 three segments in front of the last are also paler in color. Legs yel- 

 low. Sulcus across vertex and particularly deep over lower part of 

 clypeus, absent in intermediate region. Face transversely wrinkled 

 above lower sulcus and longitudinally furrowed on each side of it. 

 Clypeal foveolse 3-{-3. Antemise short, the terminal joint with four 

 sensory cones. Eyes subcircular, each composed of about 18 ocelli, 

 in five series. Collum narrowed down each side, with the lower end 

 rounded and a little inflexed, margined below and with a short longi- 

 tudinal stria or sulcus above the margining one, or this obsolete (pi. 

 14, fig. 7). Second tergite not produced below, a little exceeded by 

 the collum. Striate below. The ordinary segments are encircled by 

 a very weak furrow or constriction marked with impressed circular 

 or horseshoe-shaped impressions, with the pore lying well behind it. 

 The area in front of it is also marked across dorsum with similar im- 

 pressions, but beginning a little below level of the pore these are re- 

 placed with deep, curved striae. Anal tergite covering and slightly 

 exceeding the valves, very obtusely angular behind. Mesal borders 

 of valves but little elevated. Anal sternite transA^erse, the caudnl 

 margin obtusely angled (pi. 13, fig. 10). Legs of first two pairs in 

 male only a little enlarged, but the third to seventh pairs are strongly 

 inflated between coxae and second tarsal joint, the latter conically 

 narrowing distad. Coxae of third, fourth, and fifth legs with promi- 

 nent soft processes, which in place lie against the sternal processes. 

 The coxae of sixth legs but little produced and those of seventh not 

 at all (see pi. 14, figs. 3 to 6). 



