KEY TO NYMPHS OF HAEMOGAMASINAE 



1. Ventral shield with accessory setae 9 



Ventral shield without accessory setae 2 



2. Chelae toothless; all setae smooth 3 



Chelae with teeth; with some barbed setae 5 



3. Length-width ratio of tarsus II not over 3:1. .H. harperi, new species (p. 223) 

 Length-width ratio of tarsus II 4: 1 or greater 4 



4. Accessory anal setae larger than usual setae; usual pair of apical setae 



little if any larger than other setae of apical region. 



E. liponyssoides occidentalis, new subspecies (p. 255) 

 Accessory anal setae smaller than usual setae; usual pair of apical setae 

 distinctly largest on shield E. liponyssoides (Ewing) (p. 244) 



5. Fixed chela with 2 teeth g 



Fixed chela with 1 tooth g 



6. Genitoventral setae on ventral shield; all maxillary setae smooth; no 



barbed setae on legs E. horridus (Michael) (p. 235) 



Genitoventral setae not on ventral shield; at least 3 pairs of maxillary 

 setae barbed; many barbed setae on legs 7 



7. All maxillary setae barbed; anterior pair of sternal pores not parallel with 



with anterior margin of shield E. barberi (Ewing) (p. 249) 



Anterior pair of maxillary setae smooth; anterior pair of sternal pores 

 parallel with anterior margin of shield H. alaskensis (Ewing) (p. 213) 



8. Base of almost every dorsal body seta with a posteriorly directed thornlike 



process; anterior pair of maxillary setae smooth. 



E. oudemansi (Hirst) (p. 240) 

 No dorsal body seta with a posteriorly directed, thornlike basal process; 

 anterior pair of maxillary setae barbed E. ambulans (Thorell) (p, 228) 



9. Coxa I with a large, posteriorly directed ventral spur; genu II with a 



similar spur; movable chela toothless I. spiniger, new species (p. 258) 



Coxa I and genu II without spurs; movable chela with 2 teeth 



I. armatus, new species (p. 261) 



Nymphal specimens of H. avisugus, H. liberiensis, H. mandschuricus, 

 and E. quadrisetatus have never been found. Although the nymph of 

 H. hirsutus was said by Oudemans (1913) to resemble the adult female 

 in several respects, specific information is lacking, and, as no specimens 

 were available for study, the n3rmph of this species was omitted from 

 the preceding key. 



KEY TO MALES OF HAEMOGAMASINAE 



1. With a separate anal shield 10 



Anal region incorporated in ventral shield 2 



2. All setae smooth 3 



With some barbed setae 6 



3. Accessory sternal setae present; movable chela bifurcate. 



H. hirsutus Berlese (p. 210) 

 Accessory sternal setae absent; movable chela undivided 4 



4. Second pair of sternal setae on lateral margins of shield; anal region dis- 



tinct from remainder of shield H. harperi, new species (p. 223) 



Second pair of sternal setae not on lateral margins of shield; anal region 



not distinct from remainder of shield 5 



266 



