1922] Brolemann: Female Paraiulids 289 



lobed cephalad, and divided by a slit which is narrow anteriorly, but 

 abruptly widens backwards. The apodematic gutter {a) is moderately 

 elongate and bears numerous loops and two apical, small, globular 

 diverticula {d). 



The space left free between the valves and behind the horseshoe 

 plate is filled by a plain, subquadrangular plate {$) somewhat broader 

 than long and slightly convex, equivalent to the shield of some 

 Polydesmus; its upper margin slightly encroaches on the posterior 

 margin of the horseshoe plate, but does not seem fit to cover completely 

 the plate. 



Paeromopus chamberlini, n. sp. 



(Fig. 6—9). 



9 . Length about 84 mm.; diameter 5.10 mm.; 68 segments of which 2 apodous- 

 127 pairs of legs.— Adult. 

 Mt. Shasta, California. 



Resembles the preceding species in many features such as relative 

 length of the clypeus and of the antennse, structure of the gnatho- 

 chilarium, of the anterior body segments, of the first pair of legs, etc.* 



The mandibular stipe is not much longer than the cardo (Fig. 6); 

 It IS gradually narrowed anteriorly, the apical angle being slightly 

 produced and acute. 



Lateral expansions of the coxa; of second pair much developed 

 (Fig. 7), strongly and evenly arched. The cylindrical part entirely 

 missmg. The posterior surface is unusually callous paramesally {y) 

 and strongly projects backwards, hanging over the aperture of the 

 vestibulum. The vulvae appear spindle-shaped on the whole (Fig. 8), 

 bemg more restricted proximally than in lysiopetalinus. The main 

 body of the operculum show no special structure, but the hood [b) is 

 larger and broader, more sharpened apically and more expanded caudad, 

 made to cover entirely the mound. The latter (Fig. 9) is longer than 

 high, the_ valves are lower and more rounded, the horseshoe plate 

 and the ridge are less bent forwards, more horizontal and onlv partly 

 encroach upon the anterior truncation. The horseshoe plate (//) being 

 angularly excised, the ridge is triangular; the sHt is not broadened 

 caudad. The apodematic gutter is rather short, depressed in the 

 middle, provided with . two short diverticula {d) ; the anterior 

 diverticulum is irregularly swollen and sitting, while the posterior 

 IS globular and borne on a short, slender stalk. 



The shield {s) is as broad as the mound, strongly convex, with 

 rounded base and straight distal margin. The membranous connection 

 between the shield and the horseshoe plate being wide, the shield is 

 admitted to glide over the mound and join the hood of the operculum, 

 the ridge thus becoming entirely hidden from view. 



* Further details to be found in the description of the male given "in fine." 



