MITE'S OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 237 



anterior margin of simple and multiple fimbriae, which are more 

 numerous than in other species. Chelicerae are difficult to determine 

 accurately ; both are thick and possess bursae, which may vary in shape. 

 Each chela with two teeth; a seta at base of fixed chela and another 

 between its teeth. Corniculi of maxillae blunt ; maxillary setae smooth. 

 Only barbed setae on palps are single, stout ventral seta on each coxa. 

 Seta on legs distinctly more slender dorsally ; many of the stout ventral 

 setae with rough surfaces, but none examined were truly barbed; distal 

 margins of most leg segments serrated. 



Male. — No male specimens were available for study. According 

 to Oudemans (1913), the male may be identified as that of honidus 

 because of the following characteristics : Dorsal setation as in female ; 

 dorsal shield covers almost entire dorsal surface. Tritosternum as 

 in female; setation of ventral shield as in female. Lateral margins 

 of shield are not distinct in Oudemans' figure but appear to curve 

 anteriorly lateral to coxae IV. Structure of peritreme not mentioned 

 or figured clearly. Epistome as in female. Chelicerae not clearly 

 figured. Fixed chela with two teeth according to Michael (1892). 

 Maxillae not clearly figured. Legs as in female; without enlarged 

 setae. 



Nymph. — Dorsal shield with a slitlike invagination on each lateral 

 margin at level of coxae IV; setation as in female; pores are not 

 visible. Tritosternum and presternal area as in female. Pattern 

 of setation and position of pores on ventral shield as in female ; setae 

 on shield smooth; distinctive in that genitoventral setae, in addition 

 to sternal and metasternal setae, are on shield. Anal shield with 

 three usual setae and three most anterior accessory setae. Epistome 

 as in female. Chelicerae as in female. Maxillae not clear. Palpi 

 and legs as in female. 



Remarks. — Distinctive characteristics of female, male, and nymph 

 of E. horridus are : Female : All setae of dorsal shield smooth ; usual 

 apical setae clearly largest on shield; three or four pairs of large 

 terminal setae at posterior body margin; five pairs of pores present; 

 anterior pair of sternal setae flank middle third of anterior margin 

 of shield; all sternal setae smooth; posterior margin of genitoventral 

 shield nearly straight in some specimens; about 10 accessory setae 

 on anal shield; epistome with many slender fimbriae and with a 

 gently rounded anterior margin ; chelae stout and possess membran- 

 ous bursae; each chela with two teeth; maxillary corniculi blunt; 

 all maxillary setae smooth; stout, ventral coxal seta is only barbed 

 seta on palp ; setae on legs not barbed, but with conspicuously rough 

 surfaces; setae large; ventral setae stouter; distal margins of most 

 leg segments serrated. Male : Setation of dorsal and ventral surfaces 



