MITES OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 255 



EUHAEMOGAMASUS LIPONYSSOIDES OCCIDENTALIS, new subspecies 



Figure 52 



Female. — Dorsal shield sculptured ; may be broader than in lijyonys- 

 soides. Usual pair of apical setae little, if any, longer than other setae 

 of apical region and only slightly larger than many setae of remainder 

 of shield. Setae over entire shield posterior to apical region 9/a to 46/^ 

 apart and of two types : the smaller about 45/* in length, the larger 

 about 80/x long; the smaller ones are more numerous; all setae are 

 smooth. Setae of unprotected dorsal integument about same length 

 as larger setae of shield, longest at posterior body margin; all are 

 smooth. Lacinae of tritosternum barbed. Presternal area with faint 

 indications of spines on sutures. Sternal shield differs from that of 

 liponyssoides in having its posterior margin nearly straight rather 

 than invaginated. Genitoventral shield with more numerous accessory 

 setae than in liponyssoides ; these varied in number from 28 to 35 in a 

 series of 13 specimens; mean was 32. One distorted specimen, not 

 included in the above series, seems to possess about 45 accessory setae. 

 Anterior margin of anal shield nearly straight in some specimens; 

 setation of shield as in liponyssoides^ with three usual anal setae and 

 seven accessory setae. Endopodal shields distinct. Metapodal shields 

 as in liponyssoides. Metasternal setae about as large as posterior pair 

 of sternal setae. Setae of ventral integument slightly farther apart 

 than those of dorsal shield and, like them, of two types ; in general 

 they are larger than setae of the doi-sal shield and are largest at pos- 

 terior and lateral margins of body ; one larger pair flanks a bare spot 

 posterior to the anal shield ; all are smooth. Posterior end of peritreme 

 does not seem to be fused with coxal fovea ; tubular portion of peri- 

 treme extends to level of posterior third of coxae II. Epistome not 

 pointed as in liponyssoides; almost all fimbriae distal in position and 

 not numbering more than 10 or 12. Lateral margins of epistome nearly 

 parallel. Chelicerae as in liponyssoides except that fixed chela 

 possesses a distal seta as well as a proximal one. Maxillary and palpal 

 setae smooth. Length-width ratios of tarsi of legs are: Leg I 5:1,, 

 leg II 4 : 1, leg III 4: 1, leg IV 8 : 1. All setae are smooth. 



^/aZe.— Setae of dorsal shield more nearly uniform in size than in 

 female ; tritosternum and presternal area as in female, although spines 

 on presternal sutures may be more distinct than in the female. Seta- 

 tion of ventral shield as in female ; usual sternal setae not on lateral 

 margins of shield; shape of shield as in liponyssoides. Endopodal 

 and metapodal shields incorporated in ventral shield. Peritreme and 

 epistome as in female. Ventral body setae as in female. Chelicerae 

 differ from those of female in having fixed chela distinctly shorter 

 than movable chela, relatively thicker, and bearing only a very tiny 

 distal seta. Movable chela rodlike with a slightly curved distal end 



