40 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



surface of the last tarsomere. From the proximal end of the migui- 

 tractor plate arises the tendon of the retractor muscle of the claws 

 (xt). The unguitractor plate is rather quadrate, tapering proximally 

 into the tendon, and is partly inserted into the end of the last tarsomere. 

 Its distal end is somewhat indefinitely produced into an unsclerotized 

 area bearing two large setae. This is the empodium. 



The dorsal aspect of each tarsomere (fig. 8 C) bears a few scattered 

 moderately long but fine setae, and the ventral side of the fifth seg- 

 ment is similarly clothed. The ventral aspect of each of the first four 

 tarsomeres (fig. 8 A) is very densely set with long fine hairs, which are 

 absent from the basal portion of each tarsomere. These four tarso- 

 meres are thus united into a single hairy pad. The two setae on the 

 empodium have been called parempodia (Hayes and Kearns, 1934) 

 and are stated to arise from conspicuous trichophores on the empo- 

 dium. They are, however, perfectly normal setae, and it is doubtful 

 whether they have any such significance as is implied to them. Their 

 insertion is very inconspicuous as is usual on such lightly sclerotized 

 areas. 



The mesothoracic legs are longer than the prothoracic legs but not 

 quite as long as the metathoracic ones. As they are similar to the 

 others in structure and general arrangement, they are treated briefly 

 and not figured completely. 



The coxa of the mesothoracic leg (fig. 8 K) is shorter and ovate. 

 It is strongly convex and somewhat excavated on the ventral aspect to 

 receive the base of the femur at rest. The proximal end is slightly 

 produced on the outer side to form the coxal condyle (cxa), which 

 articulates with the pleural coxal process. The trochantinal articulation 

 is situated near the center of the proximal end and is retracted to form 

 a concavity that receives the end of the trochantin. The distal end of 

 the coxa is deeply grooved to receive the trochanter. The anterior lip 

 of the groove forms a rounded condyle that articulates in a small 

 socket on the trochanter. The ventral side of the latter is prolonged 

 proximad into the coxa, forming a large muscle attachment. The an- 

 terior aspect of the coxa is somewhat more densely clothed than the 

 prothoracic coxa, but the vestiture is practically restricted to the inner 

 or mesal half, only a very few scattered setae occurring on the con- 

 cavity laterad of the line y. The distal end of the posterior aspect also 

 bears a few setae similar to the anterior side. At the tip of the inner 

 face the setae form a long dense brush, and the punctures are so 

 close as to merge with one another. 



The trochanter is moderately densely set with long setae on the 

 ventral and anterior sides. Each of the punctures has one or more 



