MITES OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 263 



smaller than adjacent ventral body setae; two faint prominences on 

 anterior mar^n of shield ; postanal seta closer to cribriform area than 

 to anus. Endopodal shields well developed. Metapodal shields small 

 and irregular in outline. A small, oval pore immediately anterior to 

 each metasternal seta. Ventral body setae slightly smaller than those 

 of dorsal shield, some barbed, largest at posterior body margin. Pos- 

 terior end of peritreme blunt and not joined to coxal fovea. Epistome 

 with a nearly straight or gently curved anterior margin and with 

 about 30 fimbriae, some branched. Fixed chela nearly straight, with 

 two teeth and a gently curved tip ; a proximal seta present. Movable 

 chela also with two teeth; distinctive in having tip bent at a right 

 angle ; a large seta and a fringe of small setae at base of chela. Maxil- 

 lary setae smooth ; as in spiniger the lateral member of the middle pair 

 is smallest. All palpal setae smooth. Legs relatively longer and 

 slenderer than in spinigev^ dorsal setae of legs relatively small and 

 slender ; ventral setae stout, spurlike. Distinctive features of each leg 

 are : Leg I : Tarsus distinctive in tapering gradually toward its distal 

 end rather than being nearly cylindrical throughout its length ; length- 

 width ratio of tarsus 6 :1. Leg II : Relatively thicker than others ; a 

 stout spur on anterodistal margin of coxa ; two spurlike ventral setae 

 on tibia and five or six on tarsus ; some, but not all, blunt-tipped as in 

 spiniger ; length- width ratio of tarsus 4 :1. Leg III : Trochanter with 

 two, tarsus with six or seven large, ventral spurlike setae ; length- width 

 ratio of tarsus 6 : 1. Leg IV : Trochanter, femur, genu, and tibia each 

 with one or two spurlike setae; tarsus with six or seven ventral spur- 

 like setae ; length- width ratio of tarsus 8:1: 



Male. — Dorsal shield covering nearly entire dorsal surface; setae 

 may be more numerous and relatively smaller than on female. Dorsal 

 body setae as in female but sometimes slightly smaller. Tritosternum 

 and presternal area as in female. Ventral shield expanded posteriorly 

 nearly to lateral margins of coxae IV; setation differing from that of 

 female in having only two pairs of accessory setae present anterior to 

 coxae IV. Anal shield as in female. Metapodal shields distinct ; adja- 

 cent to or in contact with lateral margins of ventral shield. Ventral 

 body setae, peritreme, and epistome as in female. Chelae much like 

 those of the male of spiniger^ exact details of structure are impossible 

 to determine in specimens available for study. Palpi as in female. 

 Legs differ from those of female in following respects: Femur of 

 leg I with a stout ventral spur near its proximal margin ; femur of 

 leg II with two large, blunt, ventral spurs ; trochanter of leg III with 

 distal margin prolonged into a spur; trochanter of leg IV with two 

 large spurs, one of which is blunt. 



Nymph. — Relatively shorter than adults ; dorsal shield, dorsal body 

 setae, tritosternum, and presternal area as in female. Only two pairs 



