MITES OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 251 



accessory setae, over 100 in all specimens examined, is distinctive, these 

 setae larger than those of dorsal shield. Anal shield with three usual 

 anal setae and five smaller, accessory setae ; posterior usual seta barbed, 

 largest on shield, and set distinctly anterior to cribum. Endopodal 

 shields slender. Metapodal shields small and spindle-shaped in most 

 specimens. Tubular portion of peritreme extends to anterior mar- 

 gin of coxae II ; the median spur and invagination on posterior end 

 of peritreme distinctive; posterior pores on median margin of peri- 

 treme. Metasternal setae smooth and about as large as anterior pair 

 of sternal setae. Ventral body setae larger at margins of body, where 

 many are barbed ; one or two distinctly larger pairs at posterior body 

 margin. Either lateral margin of epistome with about 12 fimbriae, 

 most of which are multiple ; epistome relatively broad. Fixed chela 

 with a bifid tip, two teeth, an inflated laterally placed seta between 

 tip and teeth, and a proximal seta. Movable chela stouter ; possesses 

 two teeth and a proximal, ventral, fringe of setae, the extent of which 

 is difficult to determine. All maxillary setae barbed; maxillary 

 corniculi narrow and slightly indented laterally. Many palpal setae 

 barbed. Almost all setae on legs barbed ; difference in size of dorsal 

 and ventral setae not so great as in many species. Length-width ratios 

 of tarsi are : Leg I 7 : 1, leg II 6 : 1, leg III 6.5 : 1, leg IV 8 : 1. 



Male. — Dorsal shield covers almost entire dorsal surface; setation 

 and pores as in female. Setae of dorsal integament, tritosternum, and 

 presternal area as in female. Ventral shield widely expanded posterior 

 to coxae IV and curved anteriorly lateral to coxae IV. Anal region 

 distinct; accessory setae present as far anterior as level of posterior 

 pair of sternal setae. Deeply angled anterior sternal pores as in 

 female ; setation throughout shield as in female. Ventral body setae as 

 in female. Peritreme lacks median spur of female. Epistome as in 

 female. Chelae show sexual dimorphism. Fixed chela lacks teeth but 

 possesses a seta about midway on its length. Movable chela greatly 

 modified ; divided midway on its length into two branches, the shorter 

 of which has a curved, distally bifurcate tip and lacks teeth ; the larger 

 branch, also toothless, is funnel-shaped and twisted on its longi- 

 tudinal axis; a bursa and possibly setae present at base of fixed chela. 

 Maxillary corniculi more blunt than in female. Palpi as in female. 

 Setation of legs as in female except on leg II, where two conspicuously 

 stout ventral setae were present on femur, one on genu, one on tibia, 

 and two on tarsus. Legs may be relatively shorter than in female. 



Nymph. — The only nymphal specimen is crushed, and an exact 

 description is impossible. The resemblance of the epistome, cheli- 

 cerae, and maxillae to those of the adult female indicates that it is 

 the nymph of harberi. Although the ventral shield is very difficult 



