260 PROCEEDINGS OF THE NATIONAL MITSEUM vol. loi 



tion to those posterior to coxae IV there may be three or four slightly 

 bent shields adj acent to lateral and posterior margins of genitoventral 

 shield. Metasternal setae at least as large as posterior pair of usual 

 sternal setae. Ventral body setae like those on dorsal surface. Peri- 

 treme slender, details of its structure not clear. Anterior margin of 

 epistome nearly straight or forming a gentle arc; about 25 or 30 

 fimbriae. Fixed chela with a curved, pointed tip and one tooth; a 

 large seta arises near its distal end and extends beyond its tip. 

 Movable chela toothless, rodlike, with a distal seta as well as a proxi- 

 mal one. Maxillary setae relatively small, especially the lateral mem- 

 ber of the middle pair; all are smooth. Largest setae on palpi are 

 those on ventral surfaces of coxa and trochanter. Legs relatively 

 stout, their setation distinct. Leg IV largest; others about equal in 

 length. Distinctive features of each pair of legs are as follows : Leg 

 I : Length-width ratio of tarsus 3 : 1, a large, posteriorly directed spur 

 on ventral surface of coxa. Leg II : Stout to the point of distortion ; 

 femur and genu are outstanding in this respect; length-width ratio 

 of tarsus 2.5 : 1, coxa with a large, straight, ventral spur and another 

 on its anterodistal margin ; femur with a large, slightly bent spur on 

 its posterior aspect ; because of distortion femur appears wedge shaped 

 dorsally ; genu is also greatly thickened, this overdevelopment causing 

 the leg to appear twisted; genu with three of four spurlike setae 

 posteriorly; tibia with two large spurlike setae posteriorly; tarsus 

 with six or seven ventral spurs, most of which are slightly bent distally 

 and possess blunt, rounded tips. Leg III : Length-width ratio of 

 tarsus 4.5 : 1 ; most ventral setae large and with blunt, rounded tips. 

 Leg IV : Length-width ratio of tarsus 6 : 1 ; a stout, ventral spur on 

 anterodistal margin of coxa ; ventral setae on all segments large ; all 

 setae smooth ; setae on dorsal surfaces slenderer. 



Male. — Body shape, dorsal shield, setae of unprotected dorsal sur- 

 face, tritosternum, and presternal area as in female. Ventral shield 

 covers an area that apparently corresponds to sternal and genito- 

 ventral regions of female. It is narrower posterior to coxae IV and 

 tapers to a bluntly rounded end immediately anterior to the anal 

 shield ; setation of ventral surface differs from that of female in hav- 

 ing no accessory setae on central portion of the shield and in having 

 all accessory setae in sternal area of about equal size ; there are no ac- 

 cessory setae on lateral margins of shield in sternal region ; posterior 

 pair of sternal pores do not touch lateral margins of shield. Setae in 

 genitoventral region may be more numerous than in female. Anal 

 shield as in female. Endopodal shields incorporated in ventral shield. 

 Metapodal shields not seen. Metasternal setae on ventral shield. 

 Ventral body setae as in female. Peritreme not clear. Epistome as in 

 female. Chelae show sexual dimorphism ; exact relationship of struc- 

 tures present to those of female not clear. Fixed chela toothless ; with 



