220 PROCEEDINGS OF THE NATIONAL MIJSEUM vol. loi 



of shield. Genitoventral shield with 55 or 60 accessory setae in ad- 

 dition to the pair of larger usual genitoventral setae ; accessory setae 

 about twice as large as setae of dorsal shield ; a definite gap between 

 usual genitoventral setae and most anterior accessory setae; usual 

 genitoventral setae and most of accessory setae smooth; some near 

 posterolateral margin barbed. Anal shield with five accessory setae 

 in addition to three larger usual anal setae. In the specimen studied 

 there are two knoblike prominences on the anterior margin of the anal 

 shield. Metasternal setae barbed. Ventral body setae adjacent to 

 shield are of equal size with accessory genitoventral setae; laterally 

 and posteriorly they are larger and more conspicuously barbed. Pos- 

 terior end of peritreme relatively larger and slenderer than in other 

 species ; two lateral flaps present. Epistome pointed, with 8 to 10 mul- 

 tiply branched fimbriae on each lateral margin. Movable chela with 

 two teeth. Fixed chela with a bifid tip and one tooth, which is fol- 

 lowed by a ridge ; a seta is present between the tooth and the tip of 

 the chela. Long, narrow maxillary corniculi are distinctive ; it cannot 

 be determined on available specimen whether maxillary setae are 

 barbed ; most setae on palpi distinctly barbed. All setae of legs, except 

 terminal setae of tarsi, barbed. 



Male. — As in female setae on anterior portion of dorsal shield are 

 larger than those posterior to level of coxae I ; other aspects of seta- 

 tion of dorsal shields as in female. Dorsal body setae as in female. 

 Tritosternum and presternal area as in female. Setation of ventral 

 shield as in female including setation of sternal region ; ventral shield 

 curves laterally and anteriorly around coxae IV to contact posterior 

 end of peritreme ; posterior usual anal seta barbed, others not clear. 

 Peritreme as in female. Integument between peritreme and coxae 

 III and IV is sculptured and possesses spines as in the presternal area. 

 Epistome narrow, with only four or five multiply branched fimbriae 

 on each lateral margin. Movable chela divided into a short, stout 

 sperm carrier and an apparently toothless branch. Fixed chela has 

 only one tooth but may also possess a small distal seta. All maxillary 

 setae barbed. Structure of maxillae not clear, but horns are dis- 

 tinctly wider than those of female. Palpi as in female. As in female 

 almost all setae on legs are barbed. Leg II shows sexual dimorphism 

 in that especially stout ventral setae are present on the following 

 segments: Femur I, genu I, tibia I, tarsus II. Length-width ratios 

 of tarsi are : Leg I 5.5 : 1, leg II 5.5 : 1, leg III 6 : 1, leg IV 9 : 1. 



Remarks. — The nymphal stage has never been found. Distinctive 

 features of each sex are : Female : Most setae of dorsal shield barbed ; 

 accessory setae of sternal shield not present on anterior fourth of 

 shield; 55 to 60 accessory setae on genitoventral shield; usual geni- 

 toventral shield smooth; 5 accessory setae on anal shield; knoblike 



