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MILLIPEDS OF FAMILY LYSIOPETALIDAE LOOMIS 111 



at the back end of the primary crests a third to half as long as the 

 crests, except on the caudal segments where they may exceed the 

 crests in length. 



Poriferous carinae projecting scarcely more than the primary 

 crests of the dorsum ; the thin-rimmed pore area elliptic and occupy- 

 ing the entire margin, except on a few of the first pore-bearing seg- 

 ments. Below the poriferous carinae are two primary crests decid- 

 edly more prominent than those of the dorsum. 



Posterior margin of the anterior subsegments with a transverse 

 series of large, shallow, slightly oblong channels, separated by fine 

 raised lines with beaded tops; bottoms of the channels minutely 

 netted. In front of the channels the surface is rather coarsely and 

 distinctly reticulated, with a few smooth raised lines extending 

 through the netting longitudinally. 



Last segment narrowly rounded-truncate behind, with six setae 

 arising from the surface, in addition to the papillate hairs in the 

 apical margin. 



Anal valves slightly inflated, the margins thin and moderately 

 raised. 



Male gonopods consisting of two slender erect pieces variously 

 modified, in front of wliich at the base there are two very large 

 bulbous structures, more strongly chitinized on the inner side; behind 

 the base of the erect gonopods are two large, thin, veiy convex 

 shieldlike plates connected by a Y-shaped yoke, the lower part of 

 which is produced downward and forward between the two plates; 

 above the yoke the plates are joined by thin membranous tissue. 



Female organs long and slender when extruded; the outer joint 

 subcylindric, distinctly clavate, with the outer side rather narrowly 

 raised and widest a short distance behind the acutely rounded apex, 

 which extends well beyond the thicker inner portion of the joint; 

 basal part of the joint almost completely glabrous, the apical half 

 with many long bristles, which are less numerous on the raised outer 

 structure except at its tip. 



Males with the last joint of legs 1 and 2 with a comb of fine 

 hairs on the under side and with the ensuing pregenital legs and 

 some of the postgenital ones with a velutinous pad of very short 

 hairs on the under side of the last joint; coxae of the seventh legs 

 produced into erect, subconic lobes ; first pair of legs of the segments 

 near the middle of the body with coxae produced forward at the apex 

 into distinct lobes, with a small dense cluster of long hairs below 

 each lobe. 



Females with a comb of hairs beneath the outer joint of only the 

 first two pairs of legs. 



