256 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



and a truncated tip ; this chela is surrounded by an irregular bursa. 

 Maxillae and palpi as in female. Setation of legs as in female except 

 that on leg II femur, genu, tibia, and tarsus each bear a conspicuously 

 stout, ventral seta. Length-width ratios of tarsi as in female. 



Nymph. — Setae of dorsal shield less numerous than in adults ; nearly 

 uniform in size in most specimens ; all are smooth. Tritosternum and 

 presternal area as in female. Ventral shield as in liponyssoides 

 except that posterior end may be more distinctly set off from remainder 

 of shield. As in female, accessory genitoventral setae are present 

 immediately posterior to usual genitoventral setae. A pair of pores 

 on lateral margins of shield between metasternal and posterior pair of 

 sternal setae. Anal shield with only the three usual anal setae and 

 three most anterior accessory setae; shield may be narrower than 

 in the nymph of lipondyssoides ; anterior margin of shield rounded. 

 Endopodal shields very slender. Peritreme not well chitinized. 

 Epistome and chelicerae as in adult female. Maxillae as in adults. 

 Palpi may be relatively thicker than in adults. Setation of legs as 

 in female. 



Size. — ]\Iost females available for study were distorted so that ac- 

 curate measurements were impossible to obtain. In six specimens body 

 length varied from 1,036/* to l,400)ii; body width from 574/x to 798/*. 

 Mean length was 1,171/x,; mean width 730/*. In six measurable male 

 specimens body length varied from 952/t to 1,050/x, body width from 

 546/i to 588ju,. Six measurable nymphs varied in length from 677/* to 

 826/i,. It was possible to obtain only two accurate measurements of 

 body width. One specimen, 826/* long, was 420/* wide ; the other was 

 742/* long and 432/* wide. The latter specimen may have been slightly 

 distorted. 



Remarks. — Distinctive characteristics of this subspecies that serve 

 to distinguish female, male, and nymph from those of liponyssoides 

 are : Female : Usual pair of apical setae of dorsal shield little if any 

 larger than other setae of apical region ; large and small setae inter- 

 spersed on dorsal shields; lacinae of tritosternum barbed; spines on 

 presternal sutures indistinct; posterior margin of sternal shield nearly 

 straight ; genitoventral shield with 28 to 35 accessory setae ; anterior 

 margin of anal shield nearly straight ; almost all fimbriae of epistome 

 distal in position and not totaling more than 10 or 12 fixed chela with 

 a distal seta as well as a proximal one. Male : Setae of dorsal shield 

 more nearly uniform in size than those of female ; as in female, usual 

 setae little if any larger than other setae of apical region ; ventral seta- 

 tion and epistome as in female; fixed chela distinctly shorter and 

 thicker than in female and with a tiny distal seta; movable chela 

 rodlike with a truncated tip and surrounded by an irregular bursa. 

 Nymph : Some indication of two types of setae on dorsal shield ; ac- 



