MITE'S OF SUBFAMILY HAEMOGAMASINAE — KEEGAN 215 



setae on the shield. Setae over most of the shield uniform in size 

 but slightly larger at the margins, where they also are more often 

 barbed. Entire shield sculptured, and two marginal pores present 

 at the posterior end. Setae of the unprotected integument of the dorsal 

 surface about twice as large as those on shield; larger and farther 

 apart at the posterior margin. Tritosterum with both lacinae barbed. 

 Presternal area sculptured with about five transverse sutures, each of 

 which possesses minute posteriorly directed spines, which are larger on 

 the more posterior sutures. Sternal shield rectangular, with all mar- 

 gins slightly concave, although variable in this respect; sculptured; 

 with the six usual sternal setae and 10 to 32 smaller, accessory setae. 

 In the series examined the mean number of accessory setae was 23. 

 Accessory setae variable in size; those at the margins of the shield 

 larger ; in most specimens the anterior pair of usual setae are the only 

 barbed setae on the shield; in a few specimens some of the larger 

 accessory setae are barbed faintly. Distinctive is the fact that one 

 pair of accessory setae is anterior to the others and on the anterior 

 margin of the shield between the anterior pair of usual setae. This 

 condition exists in all specimens examined. Two pairs of sternal pores 

 on the shield; the more anterior of these nearly parallel with the 

 anterior margin of the shield. Genitoventral shield moderately ex- 

 panded posterior to coxae IV; sculptured; with the usual pair of 

 genitoventral setae and 24 to 55 smaller, accessory setae ; mean number 

 of accessory setae was 42 ; both usual and accessory smooth in almost all 

 cases ; in some specimens a gap exists between the usual genitoventral 

 setae and the more anterior accessory setae; in others with larger 

 numbers of setae they may be present over the entire shield. Anus 

 about equidistant from anterior and posterior margins of anal shield, 

 which is roughly triangular, with a broadly rounded anterior margin 

 and a sharply pointed posterior end; a narrow, pointed cribrum; 

 shield lacks sculpturing and possesses the three usual anal setae and 

 five or six smaller, accessary setae ; in a series of 48 examined 13 had 

 six accessory setae and 45 had five ; posterior usual seta barbed and the 

 largest seta on shield ; it lies almost at the posterior end of the shield 

 proper. Small metapodal shields present; these may vary somewhat 

 in shape but are usually oval ; some are nearly rectangular. Endopodal 

 shields are thin strands closely applied to fovea of coxae III and IV. 

 Ventral setae larger than those of dorsal surface, particularly at the 

 margins of the body ; these are larger and more heavily barbed near 

 the body margins; those at the posterior margin largest. The pair 

 of usual met asternal setae are smooth in almost all specimens and, 

 with the usual sternal setae, are the largest setae of the ventral surface. 

 Posterior ends of peritremalia fused to fovea of coxae IV; shape of 

 expanded portion of peritreme containing stigma distinctive; tu- 



