MITES OF FAMILY CHEYLETIDAE — BAKER 283 



podosomatic shield concave ; four pairs of lanceolate serrate marginal 

 setae and a pair of posterior dorsosubmedian staghornlike setae. 

 Shoulder setae simple, pilose. Hysterosomal shield almost square, 

 narrowing slightly to rear, with posterior margin concave ; two pairs 

 of lanceolate serrate marginal setae and a pair of posterior dorso- 

 submedian staghornlike setae. Anterior to the posterior plate is a 

 pair of lanceolate serrate setae ; posterior to plate two pairs of simple, 

 pilose setae. Anal setae pilose ; genital setae simple. Legs short, legs 

 I and IV about 335/^ long ; tarsus I, 120/a long ; tibia I, 67)u. long ; tarsus 

 I sensory seta only one-half as long as the simple guard seta ; tibia I 

 sensory seta lanceolate rather than clavate. Length of body 414ju,, 

 including rostrum 586/i, ; width 300ju,. 



Type habitat. — In straw mats. 



Type locality. — Portugal, intercepted at Boston, Mass. 



Ty^se.— U.S.N.M. No. 1761. 



The mite was collected December 11, 1939, by J. T. Beauchamp. 



The palpal claws, comb, and hysterosomal shield setae are 

 distinctive. 



CHEYLETUS AVERSOR Rodendorf 



Cheyletus aversor Rodendoisf, Wiss. Ber. Moskauer Staats Univ. Zool., vol. 42, pp. 

 86-87, figs. 18, 20, 1940. 



Type habitat. — Unknown. 



Type locality. — Ordzhonikidze, Union of Soviet Socialist Republics. 



CHEYLETUS DAVISI, new species 



Plate 8, Figtires 39-42 



Female. — Palpi and rostrum of normal size. Palpal femur not 

 much longer than broad ; genual seta on posterior margin of segment : 

 palpal claw with 2 basal teeth, the lower one large and notched ; outer 

 comb with 15 teeth, about one-third longer than inner comb which 

 has 20 teeth. Rostrum broadening posteriorly ; peritreme composed 

 of medium-sized segments. Propodosomatic shield rounded anteri- 

 orly ; lateral margins rounded ; posterior margin almost straight ; four 

 pairs of lanceolate serrate marginal setae; a single pair of posterior 

 dorsosubmedian staghornlike setae. Shoulder setae simple, pilose. 

 Hysterosomal shield almost square, slightly narrowing toward rear, 

 posterior margin straight ; three pairs of lanceolate serrate marginal 

 setae and a single pair of submedian staghornlike setae. Two pairs 

 of dorsoposterior pilose setae. Anal setae pilose ; two pairs of long, 

 simple, genital setae. Legs short ; leg I, 280/x long, not reaching much 

 past palpus ; leg IV, 266/x long, reaching past posterior margin of body. 

 Tarsus I, 97/t long; tibia I, 57/x long; tarsus I sensory seta short, 



810275 — 49 3 



