1922] Brolemann: Female Paraiulids 287 



lating on the inner angles of the basal expansions. The follow- 

 ing joints show the normal structure of the ambulatory legs. 

 The vulvar vestibulum is a wide depression closed by five folds 

 made of tough membrane; of these, two anterior symmetrical 

 folds (1, 2) run parallel with the basal expansions of the coxae, 

 while two lateral symmetrical folds (3, 4) connected by a fifth 

 median odd fold (5) surround the aperture backwards. On 

 each side of the vestibulum are deep invaginations {i) in which 

 the vulv« are concealed. 



In Paraiulus the conditions change according to the groups, 

 tiganus namely being strikingly different from the other species 

 in respect of vulvae, and until more material has been examined, 

 no general diagram can be proposed. It seems, however, 

 that the vulvar vestibulum is less developed, that the vulvae 

 are never hidden in independent invaginations and stand 

 side by side on the middle line, and that the limbs of the second 

 pair have always undergone a more or less advanced reduction, 

 disappearing even entirely in some cases {immaculatus-penn- 

 sylvaniciis) . 



In a larval stage of Paraiulus, supposed to be the last, 

 the second pair of legs constantly has been found to exist, 

 (Figs. 19, 20), but it differs from the ambulatory legs in that 

 the basal coxal expansion is narrower and the cylindrical 

 part is longer than usual. 



Genus Paeromopus Karsch, 1881. 



Paeromopus lysiopetalinus Karsch, 1881. 



(Fig. I and 1-5). 



9. Length 133 mm.; diameter 7.25 mm.; 75 segments, of which 1 apodous; 

 143 pairs of legs. — Adult. 



?. Length 142 mm.; diameter 7.96 mm.; 73 segments, of which 1 apodous; 

 139 pairs of legs. — Adult. 



9. Length 144 mm.; diameter 6. SO mm ; 73 segments, of which 2 apodous; 

 137 pairs of legs. — Adult. 



Sonoma County, California. 



These specimens do not entirely agree with Karsch 's description; 

 the fact that the type is a large male, measuring L50 mm. with 80 

 body segments, may account for the discrepancies. 



Color a very dark brown, with brownish limbs; clypeus fulvous; 

 metazonites adorned between the pores with orange transverse bands. 

 Body narrowed anteriorly, the diameter of the seventh segment being 

 5.20 mm., that of the 24th segment G.80 mm. Yet the second and 

 third are more swollen than the neighboring segments. 



