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MILLIPEDS OF FAMILY LYSIOPETALIDAE — LOOMIS 115 



paralleling the inner crests. Secondary crests on either side of the 

 impressed median line of segment 2 obsolete but appearing on the 

 posterior half of segment 3 and conspicuous on the segments there- 

 after. 



Transition to the full number of dorsal crests occurs on segment 9. 



Primary crests more prominent on the posterior half of the body 

 than in front, while the secondary crests become less conspicuous 

 behind the middle and are almost entirely obliterated on the last few 

 segments. Secondary crests adjacent to the median furrow smaller 

 than the other secondary crests. Setae at the back ends of the pri- 

 mary crests shorter than in soleata except on the last segments, where 

 they also equal or exceed the length of the crests. Surface between 

 and on the sides of the crests marked with extremely fine reticula- 

 tions forming lengthwise cells; the crests rather thin, the apex 

 moderately shining. 



Poriferous carinae but little more projecting than the primary 

 crests of the dorsum, the narrowly elliptic impressed area occupying 

 the entire margin except on several of the anterior segments where 

 it does not quite reach the posterior corner; rim surrounding the 

 impression thin; pore located in front of the middle of the impres- 

 sion. Below the lateral carinae are two primary crests higher than 

 the carinae or any of the dorsal crests. 



Last segment narrowly rounded-truncate behind; surface smooth 

 except for six setiferous tubercles as in soleata. 



Male genitalia simple (fig. 17, a), consisting of two slender erect 

 pieces, each of which has a small uncinate process about halfway up 

 on the outer-posterior side extending inward and slightly upward; 

 on the anterior side about halfway between the uncinate process and 

 the apex of the gonopod there is a small arm, divided at the tip into 

 two prongs; apex of the gonopod erect, slender, acute. Anterior 

 basal pieces elongate, instead of globular, as in soleata., highly chitin- 

 ized on the inner side and in front of the erect gonopod, but inflated 

 and bladderlike on the outer side. Posterior basal pieces much as in 

 soleata. 



Males with a comb of fine hairs on the under side of the last joint 

 of legs 1 and 2 ; last joint of the other legs in front of the genitalia 

 with a velutinous pad beneath, near the claw ; a number of legs fol- 

 lowing the genitalia with similar pads which decrease and vanish 

 before reaching the middle of the body. Seventh legs with coxal 

 lobes similar in shape to those of soleata., but they are smaller. An- 

 terior pair of legs on each of the midbody segments with rather long, 

 slender, f orwardly produced lobes on the coxae as in soleata. 



Type.— Male, U.S.N.M. no. 1239. 



